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

Dieses Dokument legt Anforderungen und Prüfverfahren für Schalldämpfer aus Metall für Abgasanlagen fest, die als Zubehörteile verwendet werden, um den Geräuschpegel von Verbrennungsreinrichtungen zu reduzieren.
Dieses Dokument behandelt Schalldämpfer in Verbindungsstücken und an der Mündung von Abgasanlagen.
Dieses Dokument behandelt nicht Schalldämpfer, die als Abschnitt in eine Abgasanlage eingebaut sind. Dieses Dokument schließt aktive Schalldämpfer aus.
Bauteile, die zusammen mit dem Innenrohr oder der System-Abgasanlage geprüft werden, werden in diesem Dokument 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
Publication Date
07-Apr-2020
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
08-Apr-2020
Completion Date
08-Apr-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
...

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