Chimneys - Accessories - Part 1: Chimney silencers - Requirements and test methods

This European Standard specifies requirements and test methods for flue gas silencers made of metal that are used as accessories in order to reduce the noise level of combustions appliances.
The standard covers silencers in the connecting flue pipes and on top of chimneys.
This standard does not cover silencers installed as chimney sections. This standard excludes active silencers.

Abgasanlagen - Zubehörteile - Teil 1: Schalldämpfer für Abgasanlagen - Anforderungen und Prüfverfahren

Diese Europäische Norm legt Anforderungen und Prüfverfahren für Schalldämpfer aus Metall für Abgasanlagen fest, die als Zubehörteile verwendet werden, um den Geräuschpegel von Verbrennungsanlagen zu reduzieren.
Die Norm behandelt Schalldämpfer in Verbindungsstücken und am Austritt von Abgasanlagen.
Diese Norm behandelt nicht Schalldämpfer, die als Abschnitt in eine Abgasanlage eingebaut sind. Diese Norm schließt aktive Schalldämpfer aus.
Bauteile, die zusammen mit dem Innenrohr oder der System-Abgasanlage geprüft werden, werden in dieser Norm nicht behandelt.

Conduits de fumée - Accessoires - Partie 1 : Silencieux pour conduits de fumée - Exigences et méthodes d'essai

La présente Norme européenne spécifie les exigences et les méthodes d’essai s’appliquant aux silencieux en métal, utilisés comme accessoires en vue de réduire le niveau sonore des appareils de combustion.
La présente norme concerne les silencieux installés dans les conduits de raccordement et au sommet des conduits de fumée.
La présente norme ne concerne pas les silencieux installés en tant qu’éléments de conduit de fumée. Les silencieux actifs sont exclus du domaine d’application de la présente norme.
Les composants soumis à essai en même temps que le tubage ou le conduit système ne sont pas traités par la présente norme.

Dimovodne naprave - Oprema - 1. del: Dušilniki zvoka dimovodnih naprav - Zahteve in preskusne metode

General Information

Status
Published
Public Enquiry End Date
19-Jan-2017
Publication Date
17-May-2020
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
16-Apr-2020
Due Date
21-Jun-2020
Completion Date
18-May-2020

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SLOVENSKI STANDARD
SIST EN 16475-1:2020
01-junij-2020
Dimovodne naprave - Oprema - 1. del: Dušilniki zvoka dimovodnih naprav -
Zahteve in preskusne metode

Chimneys - Accessories - Part 1: Chimney silencers - Requirements and test methods

Abgasanlagen - Zubehörteile - Teil 1: Schalldämpfer für Abgasanlagen - Anforderungen

und Prüfverfahren
Conduits de fumée - Accessoires - Partie 1 : Silencieux pour conduits de fumée -
Exigences et méthodes d'essai
Ta slovenski standard je istoveten z: EN 16475-1:2020
ICS:
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
SIST EN 16475-1:2020 en,fr,de

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN 16475-1:2020
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SIST EN 16475-1:2020
EN 16475-1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 91.060.40
English Version
Chimneys - Accessories - Part 1: Chimney silencers -
Requirements and test methods

Conduits de fumée - Accessoires - Partie 1 : Silencieux Abgasanlagen - Zubehörteile - Teil 1: Schalldämpfer für

pour conduits de fumée - Exigences et méthodes Abgasanlagen - Anforderungen und Prüfverfahren

d'essai
This European Standard was approved by CEN on 5 November 2018.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this

European Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references

concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN

member.

This European Standard exists in three official versions (English, French, German). A version in any other language made by

translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management

Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,

Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway,

Poland, Portugal, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and

United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels

© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 16475-1:2020 E

worldwide for CEN national Members.
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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
Contents Page

European foreword ....................................................................................................................................................... 4

Introduction .................................................................................................................................................................... 5

1 Scope .................................................................................................................................................................... 6

2 Normative references .................................................................................................................................... 6

3 Terms and definitions ................................................................................................................................... 7

4 Product characteristics ................................................................................................................................. 8

4.1 General ................................................................................................................................................................ 8

4.2 Dimensions and tolerances ......................................................................................................................... 8

4.3 Mechanical resistance and stability ......................................................................................................... 8

4.3.1 Compressive strength .................................................................................................................................... 8

4.3.2 Wind load ........................................................................................................................................................... 8

4.3.3 Non-vertical installation ............................................................................................................................... 8

4.4 Thermal performance ................................................................................................................................... 9

4.4.1 Reaction to fire ................................................................................................................................................. 9

4.4.2 Fire resistance (internal to external) ...................................................................................................... 9

4.5 Hygiene, health and environment ............................................................................................................. 9

4.5.1 Gas tightness ..................................................................................................................................................... 9

4.5.2 Condensate penetration resistance (liquid phase) ......................................................................... 10

4.5.3 Water vapour penetration test (vapour phase) ................................................................................ 10

4.5.4 Corrosion resistance ................................................................................................................................... 10

4.6 Materials .......................................................................................................................................................... 10

4.6.1 Metal parts in contact with combustion products or condensate .............................................. 10

4.6.2 Material for reducing noise level............................................................................................................ 10

4.7 Additional information on other materials of construction ......................................................... 11

4.8 Freeze/thaw ................................................................................................................................................... 11

4.9 Thermal resistance ...................................................................................................................................... 11

4.10 Insertion loss ................................................................................................................................................. 11

4.11 Flow resistance ............................................................................................................................................. 11

5 Testing, assessment and sampling methods ...................................................................................... 12

5.1 General ............................................................................................................................................................. 12

5.2 Declaration for type testing ...................................................................................................................... 12

5.3 Mechanical resistance and stability ...................................................................................................... 12

5.3.1 Compressive strength ................................................................................................................................. 12

5.3.2 Lateral strength ............................................................................................................................................ 12

5.4 Thermal performance ................................................................................................................................ 12

5.4.1 General ............................................................................................................................................................. 12

5.4.2 Heat stress test .............................................................................................................................................. 13

5.4.3 Sootfire test .................................................................................................................................................... 13

5.5 Hygiene, health and the environment .................................................................................................. 13

5.5.1 Gas tightness test .......................................................................................................................................... 13

5.5.2 Condensate penetration test (liquid phase) ....................................................................................... 14

5.5.3 Water vapour test (vapour phase) ......................................................................................................... 16

5.6 Insertion loss ................................................................................................................................................. 16

5.7 Flow resistance ............................................................................................................................................. 16

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SIST EN 16475-1:2020
EN 16475-1:2020 (E)

6 Assessment and verification of constancy of performance – AVCP ............................................ 16

6.1 General ............................................................................................................................................................. 16

6.2 Type testing .................................................................................................................................................... 16

6.2.1 General ............................................................................................................................................................. 16

6.2.2 Test samples, testing and compliance criteria ................................................................................... 17

6.2.3 Test reports .................................................................................................................................................... 18

6.2.4 Shared other party results ........................................................................................................................ 18

6.2.5 Cascading determination of the product type results ..................................................................... 19

6.3 Factory production control (FPC) ........................................................................................................... 20

6.3.1 General ............................................................................................................................................................. 20

6.3.2 Requirements ................................................................................................................................................. 20

6.3.3 Product specific requirements ................................................................................................................ 23

6.3.4 Initial inspection of factory and of FPC ................................................................................................. 23

6.3.5 Continuous surveillance of FPC ............................................................................................................... 24

6.3.6 Procedure for modifications ..................................................................................................................... 24

6.3.7 One-off products, pre-production products (e.g. prototypes) and products produced

in very low quantity ..................................................................................................................................... 24

7 Classification and designation ................................................................................................................. 26

7.1 General ............................................................................................................................................................. 26

7.2 Temperature classes and test temperature ........................................................................................ 26

7.3 Pressure class ................................................................................................................................................ 27

7.4 Corrosion resistance.................................................................................................................................... 27

7.5 Soot fire resistance and distance to combustible material ........................................................... 27

8 Marking, labelling and packaging ........................................................................................................... 27

8.1 Silencer ............................................................................................................................................................. 27

8.2 Packaging ......................................................................................................................................................... 28

8.3 Product information .................................................................................................................................... 28

8.3.1 Instructions ..................................................................................................................................................... 28

8.3.2 Minimum information to be included in the instructions ............................................................. 28

Annex A (informative) Recommended test sequence .................................................................................. 29

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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
European foreword

This document (EN 16475-1:2020) has been prepared by Technical Committee CEN/TC 166

“Chimneys”, the secretariat of which is held by ASI.

This European Standard shall be given the status of a national standard, either by publication of an

identical text or by endorsement, at the latest by October 2020, and conflicting national standards shall

be withdrawn at the latest by January 2022.

Attention is drawn to the possibility that some of the elements of this document may be the subject of

patent rights. CEN shall not be held responsible for identifying any or all such patent rights.

This document on “Chimneys — Accessories” consists of the following parts:
— Part 1: Chimney Silencers — Requirements and test methods (this part)
— Part 2: Chimney fans — Requirements and test methods

— Part 3: Draught regulators, standstill opening devices and combined secondary air devices —

Requirements and test methods
— Part 4: Flue dampers — Requirements and test methods
— Part 6: Access components — Requirements and test methods
— Part 7: Rain caps — Requirements and test methods

According to the CEN-CENELEC Internal Regulations, the national standards organisations of the

following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria,

Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland,

Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Republic of

North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the

United Kingdom
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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
Introduction

In November 2009 CEN/TC 166 assigned TG 1 of CEN/TC 166/WG 1 the task to develop this document

for chimney accessories and issued a preliminary work item.
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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
1 Scope

This document specifies requirements and test methods for flue gas silencers made of metal that are

used as accessories in order to reduce the noise level of combustion appliances.

The document covers silencers in the connecting flue pipes and on top of chimneys.

This document does not cover silencers installed as chimney sections. This document excludes active

silencers.

Components tested together with the liner or system chimney are not covered by this document.

2 Normative references

The following documents are referred to in the text in such a way that some or all of their content

constitutes requirements of this document. For dated references, only the edition cited applies. For

undated references, the latest edition of the referenced document (including any amendments) applies.

EN 1443, Chimneys - General requirements

EN 1602, Thermal insulating products for building applications - Determination of the apparent density

EN 1856-1:2009, Chimneys - Requirements for metal chimneys - Part 1: System chimney products

EN 1856-2:2009, Chimneys - Requirements for metal chimneys - Part 2: Metal flue liners and connecting

flue pipes
EN 1859:2009+A1:2013, Chimneys - Metal chimneys - Test methods
EN 10088-1, Stainless steels - Part 1: List of stainless steels

EN 13470, Thermal insulating products for building equipment and industrial installations -

Determination of the apparent density of preformed pipe insulation

EN 14303:2015, Thermal insulation products for building equipment and industrial installations - Factory

made mineral wool (MW) products - Specification

EN 15287-1:2007+A1:2010, Chimneys - Design, installation and commissioning of chimneys - Part 1:

Chimneys for non-roomsealed heating appliances

EN ISO 7235:2009, Acoustics - Laboratory measurement procedures for ducted silencers and air-terminal

units - Insertion loss, flow noise and total pressure loss (ISO 7235:2003)

EN ISO 11691, Acoustics - Measurement of insertion loss of ducted silencers without flow - Laboratory

survey method (ISO 11691)
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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
3 Terms and definitions

For the purposes of this document, the terms and definitions given in EN 1443, EN 1856-1, EN 1856-2,

EN 1859 and the following apply.

ISO and IEC maintain terminological databases for use in standardization at the following addresses:

— IEC Electropedia: available at http://www.electropedia.org/
— ISO Online browsing platform: available at http://www.iso.org/obp
3.1
silencer

product used in connecting flue pipes or on top of chimney for reducing noise emission caused by

heating appliances and emergency generators
3.2
flow resistance of a silencer

pressure loss in a silencer due to the flow of the flue gas at a given temperature and velocity

3.3
coefficient of flow resistance

coefficient due to directional and/or cross sectional and/or mass flow change in the flue

3.4
sootfire safe accessory

accessory that may not perform its intended function during and after a sootfire but does not prevent

the safe operation or change the designation “G” of the chimney or connecting flue pipe

Note 1 to entry: “As” is used only for accessories and not for chimneys, flue liners and connecting flue pipes.

Note 2 to entry: Sootfire safe accessories are considered as replaceable without dismantling the chimney.

Note 3 to entry: Measures to be taken after the event of a sootfire are found in 8.3.2.

3.5
insertion loss

noise reduction expressed as the reduction level of sound power propagating through a duct due to the

insertion of a silencer
3.6
nominal diameter (size)

numerical designation of size which is a convenient round number equal to or approximately equal to

the inner diameter in millimetres of the circular flue liner
3.7
nominal flow rate

amount of air which flows at the nominal velocity through a duct with nominal diameter

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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
3.8
nominal velocity
velocity in a duct which characterises the velocity used in the test

Note 1 to entry: The actual test velocity can differ from the nominal velocity, because the actual inside diameter

differs from the nominal diameter.
3.9
continuously welded silencer

housing is welded according to a continuous welding procedure that allows get at least H1 leakage class

3.10
non-continuously welded silencer
silencer not manufactured in accordance with 3.9
EXAMPLE An example for a non-continuously welded silencer is a modular silencer.
4 Product characteristics
4.1 General

The silencer shall fulfil the following requirements against temperature, condensate, corrosion

resistance and soot fire resistance capability appropriate to the designation.
4.2 Dimensions and tolerances
The thickness of material of the silencer shall be not less than that declared.

The declared internal dimensions of the flue connection shall not vary by more than ± 5 mm from the

nominal size. The measured internal dimension of the flue connection shall be not less than the

declared dimension.
4.3 Mechanical resistance and stability
4.3.1 Compressive strength

The silencer shall withstand a load of at least four times the declared design load. If declared, the

silencer shall be tested in accordance with 5.3.1.

If the design load is not declared and the silencer is used in vertical position, a support shall be used on

top of the silencer.

If used in horizontal position or on top of the chimney, the design load does not have to be declared.

4.3.2 Wind load

When the silencer is declared for outside installation, it shall be tested for wind loads in accordance

with 5.3.2.2. The silencer shall withstand a minimum wind load of 1,5 kN/m of the projected surface

area.
4.3.3 Non-vertical installation

When the silencer is declared for non-vertical installation, it shall be tested in accordance with 5.3.2.1.

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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
4.4 Thermal performance
4.4.1 Reaction to fire

The reaction to fire shall be declared. It shall be assessed on basis of EN 13501-1.

NOTE Materials which are by default classified A1 (see Commission Decision [96/603/EC (2)]) need no

further testing.
4.4.2 Fire resistance (internal to external)
4.4.2.1 General

The distance to combustible material, the gas tightness and the insertion loss of the silencer shall be

declared.
4.4.2.2 Heat stress

The silencer shall be tested in accordance with 5.4.1 for the designated temperature class, see Table 3.

The silencer shall be designated O, if the requirements of 4.5.1 and 4.10 are met.

4.4.2.3 Sootfire resistance
The silencer shall be tested in accordance with 5.4.2.

The silencer shall be designated G, if the requirements of 4.5.1 and 4.10 are met.

The silencer shall be designated As, if it is tested in accordance with 5.4.2 and only the declared

insertion loss of 4.10 is no longer fulfilled.
4.4.2.4 Distance to combustible

The minimum distance xx in mm of the silencer to combustible material shall be declared:

a) O(xx)M stands for “measured value” as determined in accordance with the test method in

EN 1856-2:2009, A.7.3.3. When related to ambient temperature of 20° C, the maximum surface

temperature of combustible materials adjacent to the test silencer shall not exceed 85° C at the

distance declared.

b) As(xx)M, G(xx)M stands for “measured value” as determined in accordance with the test method in

EN 1856-2:2009, A.7.3.3. When related to ambient temperature of 20 °C, the maximum surface

temperature of combustible materials adjacent to the test silencer shall not exceed 85 °C during

heat stress test and shall not exceed 100 °C during the heat shock test, both at the distance

declared.

c) O(xx)NM, As(xx)NM, G(xx)NM stands for “not measured value” calculated as at least three times

their nominal diameter but not less than 375 mm (as specified in EN 15287-1:2007+A1:2010,

4.3.9.3, paragraph 3, first sentence for connecting flue pipes naturally ventilated).

4.5 Hygiene, health and environment
4.5.1 Gas tightness

The gas tightness shall be tested in accordance with 5.5.1 and the class declared in accordance with

Table 1. If the jointing method is taken from a chimney/connecting flue pipe in accordance with

EN 1856-1 or EN 1856-2 the gas tightness of the connection is deemed to be satisfied.

The gas tightness of the housing for not continuously welded silencer shall be tested in accordance with

the test methods described in EN 1859. The leakage rate shall not be greater than that given in Table 1.

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SIST EN 16475-1:2020
EN 16475-1:2020 (E)

The gas tightness of continuously welded silencers is deemed to satisfying the leakage class up to H1.

For gas tightness testing all condensate drains should be closed.
Table 1 — Leakage rate
Pressure class Test pressure Leakage rate/Flue surface area
−1 −2
𝑙𝑙 ∙ 𝑠𝑠 ∙ 𝑚𝑚
N1 40 < 2,0
P1 200 < 0,006
P2 200 < 0,120
M1 1 500 < 0,006
M2 1 500 < 0,120
H1 5 000 < 0,006
H2 5 000 < 0,120
4.5.2 Condensate penetration resistance (liquid phase)

When tested in accordance with 5.5.2 no condensate shall appear on the outer surface of the silencer.

The silencer shall be installed according to the instructions in the thermal test assembly of

EN 1856-2:2009, Figure A.5, attaching the spray assembly to the top of the test chimney, and providing

a drain for the condensate at the bottom.

The declaration of condensate resistance does not refer to any noise reduction performance.

4.5.3 Water vapour penetration test (vapour phase)

Silencer can be designated W (wet) without undertaking the water vapour diffusion test, provided that

the product passes the condensate penetration resistance requirement of 4.5.2.
4.5.4 Corrosion resistance

The corrosion resistance of the silencer shall be equivalent to the corrosion resistance of the

chimney/connecting flue pipe to which it is connected.
4.6 Materials
4.6.1 Metal parts in contact with combustion products or condensate

The silencers in contact with combustion products shall have a specification for steel in accordance with

EN 10088-1. Material L50 or higher in accordance with EN 1856-1:2009, Table 4, is deemed to fulfil V2

for dry and for wet applications. For other materials L99 according to EN 1856-1:2009, Table 4, the

corrosion test in accordance with EN 1856-1 shall be performed.
4.6.2 Material for reducing noise level

The product characteristics shall meet the requirements of EN 14303:2015, 4.3, for the following

characteristics:

— maximum service temperature (equal to maximum service temperature of the silencer);

— water absorption shall not exceed 1,0 kg/m ;
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SIST EN 16475-1:2020
EN 16475-1:2020 (E)
— water vapour diffusion resistance (EN 14303:2015, 4.3.6, declared value);
— sound absorption coefficient (EN 14303:2015, 4.3.8, declared value);
and in addition:

— the density of flat insulation materials shall be determined as specified in EN 1602. The density of

cylindrical insulation materials shall be determined in accordance with EN 13470. The insulation

3 3

materials shall have a density of between 80 kg/m and180 kg/m . The permissible tolerance for

the density shall be ± 10 %;
— loss of ignition (binder content and additive)shall be less than 5 % by mass;

— the reaction to fire classification (Euro class) shall be checked as specified in EN 13501-1. The

insulation materials shall be non-combustible in accordance with Euro class A1;

— the release of water-soluble chloride content of the mineral wool product in accordance with

EN 14303:2015, 4.3.7, shall be less than 10 mg/kg;

— for stainless steel wool: material quality 1.4113 and 1.4841 deemed to be fulfilling the relevant

characteristics.
4.7 Additional information on other materials of construction

Not inherently stable materials shall be protected in that way that the flue is not reduced or blocked and

that in any operating conditions mineral wool is protected against condensate (e.g. with a drain).

4.8 Freeze/thaw
Metal products are deemed to satisfy freeze/thaw resistance.
4.9 Thermal resistance

The declared thermal resistance value of the silencer shall be verified either by testing, according to the

test method of EN 1859 (being the reference value), or by calculation using the simplified calculation

method of EN 1859.

When the value for the thermal resistance is calculated, the thermal conductivity value shall be based

on the mean temperature of the insulation depending on the nominal temperature of Table 3 up to

200 °C.
4.10 Insertion loss
For silencers the insertion loss shall be determined according to 5.6.

The insertion loss of the silencer shall be declared in the product information according to 8.3.2 at

ambient temperature. The insertion loss shall be determined in the octave band or where necessary, in

the third band for the frequency area.

The operation conditions shall be declared for the insertion loss in accordance with EN ISO 7235.

4.11 Flo
...

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Dimovodne naprave - Oprema - 1. del: Dušilniki zvoka dimovodnih naprav - Zahteve in preskusne metodeAbgasanlagen - Zubehörteile - Teil 1: Schalldämpfer für Abgasanlagen - Anforderungen und PrüfverfahrenConduits de fumée - Accessoires - Partie 1 : Silencieux - Exigences et méthodes d'essaiChimneys - Accessories - Part 1: Chimney silencers - Requirements and test methods91.060.40Dimniki, jaški, kanaliChimneys, shafts, ductsICS:Ta slovenski standard je istoveten z:prEN 16475-1oSIST prEN 16475-1:2017en,fr,de01-januar-2017oSIST prEN 16475-1:2017SLOVENSKI

STANDARD
oSIST prEN 16475-1:2017
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
DRAFT prEN 16475-1
November
t r s x ICS
{ sä r x rä v r English Version
Chimneys æ Accessories æ Part

sã Chimney silencers æ Requirements and test methods Conduits de fumée æ Accessoires æ Partie

s ã Silencieux æExigences et méthodes d 5essai
Abgasanlagen æ Zubehörteile æ Teil

sã Schalldämpfer für Abgasanlagen æ Anforderungen und Prüfverfahren This draft European Standard is submitted to CEN members for enquiryä It has been drawn up by the Technical Committee

If this draft becomes a European Standardá CEN members are bounwhich stipulate the conditions for giving this European Standard the status of a national standard without any alterationä

This draft European Standard was established by CEN in three ofer language made by translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

Recipients of this draft are invited to submitá with their commentsá notification of any relevant patent rights of which they are aware and to provide supporting documentationä

Warning ã This document is not a European Standardä It is distributed for review and commentsä It is subject to change without notice and shall not be referred to as a European Standardä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä prEN

s x v y wæ sã t r s x EoSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 2 Contents Page European foreword ....................................................................................................................................................... 4 Introduction .................................................................................................................................................................... 5 1 Scope .................................................................................................................................................................... 6 2 Normative references .................................................................................................................................... 6 3 Terms and definitions ................................................................................................................................... 6 4 Product characteristics ................................................................................................................................. 7 4.1 General ................................................................................................................................................................ 7 4.2 Dimensions and tolerances ......................................................................................................................... 8 4.3 Mechanical resistance and stability ......................................................................................................... 8 4.4 Thermal performance ................................................................................................................................... 8 4.4.1 Reaction to fire ................................................................................................................................................. 8 4.4.2 Fire resistance (internal to external) ...................................................................................................... 8 4.5 Hygiene, health and environment ............................................................................................................. 9 4.5.1 Gas tightness ..................................................................................................................................................... 9 4.5.2 Condensate penetration resistance (liquid phase) ............................................................................ 9 4.5.3 Water vapour penetration test (vapour phase) ................................................................................... 9 4.5.4 Corrosion resistance ...................................................................................................................................... 9 4.5.5 Dangerous substances ................................................................................................................................ 10 4.6 Materials .......................................................................................................................................................... 10 4.6.1 Metal parts in contact with combustion products or condensate .............................................. 10 4.6.2 Material for reducing noise level............................................................................................................ 10 4.7 Additional information on other materials of construction ......................................................... 10 4.8 Freeze/thaw ................................................................................................................................................... 11 4.9 Thermal resistance ...................................................................................................................................... 11 4.10 Insertion loss ................................................................................................................................................. 11 4.11 Flow resistance ............................................................................................................................................. 11 5 Testing, assessment and sampling methods ...................................................................................... 11 5.1 Manufacturer's declaration for type testing ...................................................................................... 11 5.2 Mechanical resistance and stability ...................................................................................................... 11 5.2.1 Compressive strength ................................................................................................................................. 11 5.2.2 Lateral strength ............................................................................................................................................ 11 5.3 Thermal performance ................................................................................................................................ 12 5.3.1 Heat stress test .............................................................................................................................................. 12 5.3.2 Sootfire test .................................................................................................................................................... 12 5.4 Hygiene, health and the environment .................................................................................................. 12 5.4.1 Gas tightness test .......................................................................................................................................... 12 5.4.2 Condensate penetration test (liquid phase) ....................................................................................... 12 5.4.3 Water vapour test (vapour phase) ......................................................................................................... 12 5.5 Insertion loss ................................................................................................................................................. 12 5.6 Flow resistance ............................................................................................................................................. 12 6 Assessment and verification of constancy of performance – AVCP............................................ 12 6.1 General ............................................................................................................................................................. 12 6.2 Type testing .................................................................................................................................................... 13 6.2.1 General ............................................................................................................................................................. 13 oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 3 6.2.2 Test samples, testing and compliance criteria ................................................................................... 13 6.2.3 Test reports .................................................................................................................................................... 15 6.2.4 Shared other party results ........................................................................................................................ 15 6.2.5 Cascading determination of the product type results ..................................................................... 15 6.3 Factory production control (FPC) ........................................................................................................... 17 6.3.1 General ............................................................................................................................................................. 17 6.3.2 Requirements ................................................................................................................................................. 17 6.3.3 Product specific requirements ................................................................................................................ 19 6.3.4 Initial inspection of factory and of FPC ................................................................................................. 20 6.3.5 Continuous surveillance of FPC ............................................................................................................... 20 6.3.6 Procedure for modifications ..................................................................................................................... 20 6.3.7 One-off components, pre-production products (e.g. prototypes) and components produced in very low quantity ................................................................................................................. 21 7 Classification and designation ................................................................................................................. 22 7.1 General ............................................................................................................................................................. 22 7.2 Temperature classes and test temperature ........................................................................................ 23 7.3 Pressure class ................................................................................................................................................ 23 7.4 Corrosion resistance.................................................................................................................................... 23 7.5 Soot fire resistance and distance to combustible material ........................................................... 23 8 Marking, labelling and packaging ........................................................................................................... 23 8.1 Silencer ............................................................................................................................................................. 23 8.2 Packaging ......................................................................................................................................................... 24 8.3 Product information .................................................................................................................................... 24 8.3.1 Manufacturer's instructions ..................................................................................................................... 24 8.3.2 Minimum information to be included in the manufacturer's instructions ............................. 24 Annex A (informative)

Recommended test sequence..................................................................................... 25 A.1 Check the manufacturer’s literature ..................................................................................................... 25 A.2 Dimensional check ....................................................................................................................................... 25 A.3 Assemble test sample .................................................................................................................................. 25 A.4 Mechanical resistance and stability ....................................................................................................... 25 A.5 Gas tightness ................................................................................................................................................... 25 A.6 Thermal performance test (if applicable) ........................................................................................... 25 A.7 Gas tightness ................................................................................................................................................... 25 A.8 Mechanical resistance and stability ....................................................................................................... 25 A.9 Confirm manufacturer information ....................................................................................................... 25 A.10 Check marking, labelling and packaging.............................................................................................. 25 Annex ZA (informative)

Relationship of this European Standard with Regulation (EU) No.305/2011 .................................................................................................................................................. 26 ZA.1 Scope and relevant characteristics ........................................................................................................ 26 ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) ...................... 27 ZA.3 Assignment of AVCP tasks ......................................................................................................................... 27 Bibliography ................................................................................................................................................................. 29 oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 4 European foreword This document (prEN 16475-1:2016) has been prepared by Technical Committee CEN/TC 166 “Chimneys”, the secretariat of which is held by ASI. This document is currently submitted to the CEN Enquiry. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of EU Directive(s). For relationship with EU Directive(s), see informative Annex ZA, which is an integral part of this document. EN 16475-1 is a part of the series of standards for “Chimneys — Accessories” and consists of: — Part 1 – Silencers (this part) — Part 2 - Exhaust fans — Part 3 - Draught regulators, standstill opening devices and combined secondary air devices — Part 4 - Flue dampers — Part 5 - Explosion/implosion relief devices — Part 6 - Access components — Part 7 – Rain caps oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 5 Introduction In November 2009 CEN/TC 166 assigned TG 1 of CEN/TC 166/WG 1 the task to develop this standard for chimney accessories and issued a preliminary work item. oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 6 1 Scope This European Standard specifies requirements and test methods for flue gas silencers made of metal that are used as accessories in order to reduce the noise level of combustions appliances. The standard covers silencers in the connecting flue pipes and on top of chimneys. This standard does not cover silencers installed as chimney sections. This standard excludes active silencers. Components tested together with the liner or system chimney are not covered by this standard. 2 Normative references The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1443, Chimneys — General requirements EN 1602, Thermal insulating products for building applications — Determination of the apparent density EN 1856-1:2009, Chimneys — Requirements for metal chimneys — Part 1: System chimney products EN 1856-2:2009, Chimneys — Requirements for metal chimneys — Part 2: Metal flue liners and connecting flue pipes EN 1859:2009+A1:2013, Chimneys — Metal chimneys — Test methods EN 14297, Chimneys — Freeze-thaw resistance test method for chimney products EN 14303:2016, Thermal insulation products for building equipment and industrial installations — Factory made mineral wool (MW) products — Specification EN 10088-1, Stainless steels — Part 1: List of stainless steels EN 13470, Thermal insulating products for building equipment and industrial installations — Determination of the apparent density of preformed pipe insulation EN 15287-1:2007+A1:2010, Chimneys — Design, installation and commissioning of chimneys — Part 1: Chimneys for non-roomsealed heating appliances EN ISO 7235:2009, Acoustics — Laboratory measurement procedures for ducted silencers and air-terminal units — Insertion loss, flow noise and total pressure loss (ISO 7235:2003) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1443, EN 1856-1, EN 1856-2, EN 1859 and the following apply. 3.1 silencer product used in connecting flue pipes or on top of chimney for reducing noise emission caused by heating appliances and emergency generators oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 7 3.2 flow resistance of a silencer pressure loss in a silencer due to the flow of the flue gas at a given temperature and velocity 3.3 coefficient of flow resistance coefficient due to directional and / or cross sectional and / or mass flow change in the flue 3.4 sootfire safe accessory (As) accessory that may not perform its intended function during and after a sootfire but does not prevent the safe operation or change the designation “G” of the chimney or connecting flue pipe Note 1 to entry: “As” is used only for accessories and not for chimneys, flue liners and connecting flue pipes. Note 2 to entry: Sootfire safe accessories are considered as replaceable without dismantling the chimney. Note 3 to entry: Measures to be taken after the event of a sootfire are found in 8.3.2. 3.5 insertion loss noise reduction expressed as the reduction level of sound power propagating through a duct due to the insertion of a silencer 3.6 nominal diameter (size) numerical designation of size which is a convenient round number equal to or approximately equal to the inner diameter in millimetres of the circular flue liner 3.7 nominal flow rate amount of air which flows at the nominal velocity through a duct with nominal diameter 3.8 nominal velocity velocity in a duct which characterises the velocity used in the test (the actual test velocity may differ from the nominal velocity, because the actual inside diameter differs from the nominal diameter) 3.9 continuously welded silencer housing is welded according to a continuous welding procedure that allows get at least H1 leakage class 3.10 non-continuously welded silencer silencer not manufactured in accordance with 0 EXAMPLE An example for a non-continuously welded silencer is a modular silencer. 4 Product characteristics 4.1 General The silencer shall fulfil the following requirements against temperature, condensate, corrosion resistance and soot fire resistance capability appropriate to the designation. oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 8 4.2 Dimensions and tolerances The thickness of material of the silencer shall be not less than that declared by the manufacturer. The declared internal dimensions of the flue connection shall not vary by more than ± 5 mm from the nominal size. The measured internal dimension of the flue connection shall be not less than the manufacturer's declared dimension. 4.3 Mechanical resistance and stability 4.3.1 Design load The manufacturer shall declare the relevant design loads. 4.3.2 Wind load When the manufacturer declares the silencer for outside installation, it shall be tested for wind loads in accordance with 5.2.2.2. The silencer shall withstand a minimum wind load of 1,5 kN/m2 of the projected surface area. 4.4 Thermal performance 4.4.1 Reaction to fire Products covered by this document are deemed to meet the requirements for reaction to fire, without the need for testing provided that they satisfy the definitions given in Commission Decision 96/603//EC (2). 4.4.2 Fire resistance (internal to external) 4.4.2.1 General The manufacturer shall declare the distance to combustible material, the gas tightness and the insertion loss of the silencer. 4.4.2.2 Heat stress The silencer shall be tested in accordance with 5.3.1 for the designated temperature class, see Table 3. The silencer shall be designated O, if the requirements of 4.5.1 and 4.10 are met. 4.4.2.3 Sootfire resistance The silencer shall be tested in accordance with 5.3.2. The silencer shall be designated G, if the requirements of 4.5.1 and 4.10 are met. The silencer shall be designated As, if it is tested in accordance with 5.3.2 and only the declared insertion loss of 4.10 is no longer fulfilled. 4.4.2.4 Distance to combustible The manufacturer shall declare the minimum distance of the silencer to combustible material: a) O(xx)M stands for “measured value” as determined in accordance with the test method in EN 1856-2:2009, A.7.3.3. When related to ambient temperature of 20° C, the maximum surface temperature of combustible materials adjacent to the test silencer shall not exceed 85° C at the distance declared. b) As(xx)M, G(xx)M stands for “measured value” as determined in accordance with the test method in EN 1856-2:2009, A.7.3.3. When related to ambient temperature of 20° C, the maximum surface oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 9 temperature of combustible materials adjacent to the test silencer shall not exceed 85° C during heat stress test and shall not exceed 100°C during the heat shock test, both at the distance declared. c) O(xx)NM, As(xx)NM, G(xx)NM stands for “not measured value” as determined in EN 1856-2:2009, A.7.3.3 or calculated as at least three times their nominal diameter but not less than 375 mm (as specified in EN 15287-1:2007+A1:2010, 4.3.9.3, paragraph 3, first sentence for connecting flue pipes naturally ventilated). 4.5 Hygiene, health and environment 4.5.1 Gas tightness The gas tightness shall be tested in accordance with 5.4.1 and the class declared in accordance with Table 2. If the jointing method is taken from a chimney/connecting flue pipe in accordance with EN 1856-1 or EN 1856-2 the gas tightness of the connection is deemed to be satisfied. The gas tightness of the housing for not continuously welded silencer shall be tested in accordance with the test methods described in EN 1859 the leakage rate shall not be greater than that given in Table 1. The gas tightness of continuously welded silencers is deemed to satisfying the leakage class up to H1. For gas tightness testing all condensate drains should be closed. Table 1 — Leakage rate Class Test pressure Pa Leakage rate/Flue surface area l · s-1·m-2 N1 40 < 2,0 P1 200 < 0,006 P2 200 < 0,120 M1 1 500 < 0,006 M2 1 500 < 0,120 H1 5 000 < 0,006 H2 5 000 < 0,120 4.5.2 Condensate penetration resistance (liquid phase) When tested in accordance with 5.4.2 no condensate shall appear on the outer surface of the silencer. The silencer shall be installed according to the manufacturer’s instructions in the thermal test assembly of EN 1856-2:2009, Figure A.5, attaching the spray assembly to the top of the test chimney, and providing a drain for the condensate at the bottom. The declaration of condensate resistance does not refer to any noise reduction performance. 4.5.3 Water vapour penetration test (vapour phase) Silencer can be designated W (wet) without undertaking the water vapour diffusion test, provided that the product passes the condensate penetration resistance requirement of 4.5.2. 4.5.4 Corrosion resistance The corrosion resistance of the silencer shall be equivalent to the corrosion resistance of the chimney/connecting flue pipe to which it is connected oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 10 4.5.5 Dangerous substances National regulations on dangerous substances may require verification and declaration on release, and sometimes content, when construction products covered by this standard are placed on those markets. In the absence of European harmonized test methods, verification and declaration on release/content should be done taking into account national provisions in the place of use. NOTE An informative database covering European and national provisions on dangerous substances is available at the Construction website on EUROPA accessed through: https://ec.europa.eu/growth/tools-databases/cp-ds_en . 4.6 Materials 4.6.1 Metal parts in contact with combustion products or condensate The silencers in contact with combustion products shall have a specification for steel in accordance with to EN 10088-1 according to EN 1856-1, Table 4, deemed to fulfil V2 for dry and for wet applications. For other materials (L99 according to EN 1856-1:2009, Table 4) the corrosion test according to EN 1856-1 shall be performed. 4.6.2 Material for reducing noise level The product characteristics shall meet the requirements of EN 14303, 4.3, for the following characteristics: — maximum service temperature (equal to maximum service temperature of the silencer); — water absorption shall not exceed 1,0 kg/m2; — water vapour diffusion resistance (EN 14303, 4.3.6, manufacturer declared value); — sound absorption coefficient (EN 14303, 4.3.8, manufacturer declared value); o and in addition: — the density of flat insulation materials shall be determined as specified in EN 1602. The density of cylindrical insulation materials shall be determined in accordance with EN 13470. The insulation materials shall have a density of between 80 kg/m3 and180 kg/m3. The permissible tolerance for the density shall be ± 10 %; — loss of ignition (binder content and additive)shall be less than 5 % by mass; — the reaction to fire classification (Euro class) shall be checked as specified in EN 13501-1. The insulation materials shall be non-combustible in accordance with Euro class A1. — the release of water-soluble chloride content of the mineral wool product in accordance with EN 14303, 4.3.7, shall be less as 10 mg/kg; — for stainless steel wool: material quality 1.4113 and 1.4841 deemed to be fulfilling the relevant characteristics. 4.7 Additional information on other materials of construction Not inherently stable materials shall be protected in that way that the flue is not reduced or blocked and that in any operating conditions mineral wool is protected against condensate (e.g. with a drain). oSIST prEN 16475-1:2017

prEN 16475-1:2016 (E) 11 4.8 Freeze/thaw Metal products are deemed to satisfy freeze/thaw resistance. 4.9 Thermal resistance The thermal resistance value of the silencer declared by the manufacturer shall be verified either by testing, according to the test method of EN 1859 (being the reference value), or by calculation using the simplified calculation method of EN 1859. When the value for the thermal resistance is calculated, the thermal conductivity value shall be based on the mean temperature of the insulation depending on the nominal temperature of Table 3 up to 200 °C. 4.10 Insertion loss For silencers the insertion loss shall be determined according to 5.5. The manufacturer shall declare the insertion loss of the silencer in the product information according to 8.3.2 at ambient temperature. The insertion loss shall be determined in the octave band or where necessary, in the third band for the frequency area. The manufacturer also shall declare the operation conditions for the insertion loss in accordance with EN ISO 7235. 4.11 Flow re

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