prEN 1856-1

Chimneys - Requirements for metal chimneys - Part 1: System chimney products

This European Standard specifies the performance requirements for single and multi-wall system chimney products with rigid metallic
liners (chimney sections, chimney fittings and terminals, including supports) with nominal diameter up to and including 1200 mm, used
to convey the products of combustion from appliances to the outside atmosphere. It also specifies the requirements for marking,
manufacturer's instructions, product information and evaluation of conformity. Metal liners and metal connecting flue pipes not covered
here are included in EN 1856-2:2009. This European Standard does not apply to structurally independent (free standing or self-supporting) chimneys.

Abgasanlagen - Anforderungen an Metall- Abgasanlagen - Teil 1: Bauteile für System- Abgasanlagen

Dieses Dokument legt die Leistungsmerkmale für Bauteile für ein- und mehrschalige System-Abgasanlagen mit starren Metallinnenrohren (Abschnitte der Abgasanlagen, Formstücke und Aufsätze, einschließlich der Stützen) mit einem Nenndurchmesser von 1 200 mm fest, die zur Ableitung von Verbrennungsprodukten von Feuerstätten an die Außenluft verwendet werden.
Dieses Dokument legt zudem die Eigenschaften der Zuluftschächte von konzentrischen Abgasanlagen für raumluftunabhängige Anwendungen fest. Darüber hinaus werden die Eigenschaften für die Kennzeichnung, die Herstellerangaben, die Produktinformationen sowie die Bewertung und Überprüfung der Leistungs¬konstanz (AVCP, en:assessment and verification of constancy of performance) festgelegt. Innenrohre und Verbindungsstücke aus Metall, die in dieser Norm nicht behandelt werden, sind in prEN 1856 2:2019 angegeben.
Dieses Dokument gilt nicht für Abgasanlagen (freistehend oder selbststützend), die von der Trag-konstruktion unabhängig errichtet werden können.

Conduits de fumée - Prescriptions pour les conduits de fumée métalliques - Partie 1 : Composants de systèmes de conduits de fumée

Le présent document spécifie les caractéristiques de performance des systèmes de conduits de fumée avec conduits intérieurs métalliques rigides simple ou multi-parois (éléments droits, éléments de conduit de fumée et terminaux, y compris les supports) d'un diamètre nominal jusqu'à 1 200 mm inclus, utilisés pour évacuer les produits de combustion des appareils jusqu'à l'atmosphère extérieure.
Ce document spécifie aussi les caractéristiques des conduits d'alimentation en air des conduits de fumée concentriques pour les applications à circuit étanche. De plus, il spécifie les caractéristiques de marquage, les instructions du fabricant, les informations relatives au produit ainsi que l'évaluation et la vérification de la constance des performances (EVCP). Les tubages et éléments de raccordement métalliques qui ne sont pas traités ici font l'objet du prEN 1856 2:2019.
Le présent document ne s'applique pas aux conduits de fumée structurellement indépendants (autoporteurs ou autonomes).

Dimniki - Zahteve za kovinske dimnike - 1. del: Proizvodi za sistemske dimnike

General Information

• Status: Not Published
• ICS: 91.060.40 - Chimneys, shafts, ducts
• Technical Committee: CEN/TC 166 - Chimneys
• Drafting Committee: CEN/TC 166/SC 2/WG 2 - System Chimneys and Test Methods
• Current Stage: 4098 - Decision to abandon - Enquiry
• Completion Date: 31-Mar-2021
• Mandate: M/105 - Mandate to CEN/CENELEC concerning the execution of standardization work for harmonized standards on chimneys, flues and specific products
• Mandate: M/117 - Horizontal complement to the mandates to CEN/CENELEC concerning the execution of standardization work for the valuation of construction products and elements in respect of their resistance to fire
• Ref Project: oSIST prEN 1856-1:2019 - Chimneys - Requirements for metal chimneys - Part 1: System chimney products

Overview

prEN 1856-1 is the CEN draft European Standard for metal chimneys - system chimney products. It defines performance, testing and conformity requirements for single- and multi-wall system chimney components with rigid metallic liners (sections, fittings, terminals and supports) up to 1200 mm nominal diameter, used to convey combustion products to the outside atmosphere. The standard covers marking, manufacturer’s instructions, product information and Assessment and Verification of Constancy of Performance (AVCP). It does not apply to structurally independent (free‑standing) chimneys; related metal liners and connecting flue pipes are covered by EN 1856-2:2009.

Key Topics

• Product characteristics: dimensions and tolerances, mechanical resistance (compressive, tensile, lateral strength), reaction to fire and resistance to fire, sootfire resistance classes and thermal performance.
• Hygiene and safety: gas tightness, condensate resistance (vapour/liquid), rainwater penetration and resistance to accidental human contact and thermal hazards.
• Durability: corrosion resistance, freeze–thaw behaviour and elastomeric seal performance.
• System-specific features: requirements for concentric and multi-served chimneys, balanced and non‑balanced terminals, air supply ducts and terminals.
• Testing methods: standardized tests for mechanical loads, thermal performance, corrosion, flow resistance, wind effects, penetration by foreign objects and vertical loading on terminals.
• Conformity & factory control: AVCP procedures, type testing, factory production control (FPC), sampling, marking, labelling and packaging requirements.
• Documentation: mandatory manufacturer’s instructions and minimum product information for safe selection, installation and maintenance.

Applications and Who Uses It

prEN 1856-1 is practical for organizations involved in the lifecycle of metal chimney systems:

• Manufacturers of chimney sections, fittings, terminals and supports - for product design, testing and CE marking.
• Testing and certification bodies - for type testing, AVCP and FPC audits.
• Specifiers, architects and HVAC engineers - to select compliant chimney systems for buildings and appliances.
• Installers and maintenance professionals - to follow manufacturer instructions and ensure safe installation and service.
• Regulators and building authorities - to reference harmonized safety, fire and durability criteria.

Using prEN 1856-1 helps ensure metal chimneys meet consistent safety, fire-resistance, durability and performance expectations across Europe.

Related standards

• EN 1856-2:2009 - metal liners and connecting flue pipes (complements prEN 1856-1)
• (prEN 1856-1 is intended to supersede earlier related EN documents listed in the draft)

Keywords: prEN 1856-1, metal chimneys, system chimney products, CEN, chimney sections, chimney fittings, terminals, fire resistance, corrosion resistance, AVCP, factory production control, chimney marking.

Standards Content (Sample)

SLOVENSKI STANDARD
01-september-2019
Dimniki - Zahteve za kovinske dimnike - 1. del: Proizvodi za sistemske dimnike
Chimneys - Requirements for metal chimneys - Part 1: System chimney products
Abgasanlagen - Anforderungen an Metall- Abgasanlagen - Teil 1: Bauteile für System-
Abgasanlagen
Conduits de fumée - Prescriptions pour les conduits de fumée métalliques - Partie 1 :
Composants de systèmes de conduits de fumée
Ta slovenski standard je istoveten z: prEN 1856-1
ICS:
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2019
ICS 91.060.40 Will supersede EN 14989-1:2007, EN 14989-2:2007,
EN 1856-1:2009, EN 1859:2009+A1:2013
English Version
Chimneys - Requirements for metal chimneys - Part 1:
System chimney products
Conduits de fumée - Prescriptions pour les conduits de Abgasanlagen - Anforderungen an Metall-
fumée métalliques - Partie 1 : Composants de systèmes Abgasanlagen - Teil 1: Bauteile für System-
de conduits de fumée Abgasanlagen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 166.
If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey and United Kingdom.
Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are
aware and to provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without
notice and shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1856-1:2019 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 6
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Product characteristics . 13
4.1 General . 13
4.2 Dimensions and tolerance . 13
4.3 Mechanical resistance and stability . 14
4.3.1 Compressive strength . 14
4.3.2 Tensile strength . 14
4.3.3 Lateral strength . 14
4.4 Reaction to fire . 15
4.5 Resistance to fire . 15
4.5.1 Resistance to fire (external to external) . 15
4.5.2 Sootfire resistance classes . 15
4.5.3 Sootfire resistance . 15
4.5.4 Thermal performance under normal operating conditions . 15
4.6 Hygiene, health and environment, gas tightness . 16
4.7 Safety in use. 17
4.7.1 Accidental human contact . 17
4.7.2 Thermal resistance . 17
4.7.3 Condensate resistance (vapour phase) . 17
4.7.4 Condensate penetration (liquid phase) . 18
4.7.5 Rainwater penetration resistance . 18
4.7.6 Flow resistance of the chimney, fittings and terminals . 18
4.7.7 Other characteristics for terminals . 18
4.8 Durability . 19
4.8.1 Durability of the flue liner against corrosion . 19
4.8.2 Freeze-thaw resistance . 22
4.8.3 Elastomeric seals in flue liners . 22
4.9 Specific characteristics for concentric and multi-served chimneys and their
terminals . 22
4.9.1 General . 22
4.9.2 Single and multi-served concentric chimney . 23
4.9.3 Terminals . 23
4.9.4 Balanced flue terminals, for single and multi-served chimneys . 24
4.9.5 Non-balanced terminals for multi-served chimneys . 28
5 Testing, assessment and sampling methods specific to metal chimneys . 28
5.1 General . 28
5.2 Compressive strength . 28
5.2.1 Sections and Fittings . 28
5.2.2 Chimney support . 30
5.3 Tensile strength . 32
5.3.1 Test assembly . 32
5.3.2 Test procedure and results . 32
5.4 Lateral strength . 34
5.4.1 Fittings in non-vertical orientation . 34
5.4.2 Wind load . 34
5.5 Thermal performance test . 35
5.5.1 General . 35
5.5.2 Test structure . 35
5.5.3 Test chimney . 36
5.5.4 Vibration conditioning. 36
5.6 Corrosion resistance test . 36
5.7 Rainwater ingress for terminals . 36
5.8 Flow resistance test . 36
5.8.1 Flow resistance test for terminals . 36
5.8.2 Flow resistance test for fittings . 38
5.9 Flow resistance test for air supply ducts of the concentric chimneys . 38
5.10 Wind effect test . 38
5.11 Resistance to penetration by foreign objects . 39
5.11.1 Test assembly . 39
5.11.2 Procedure . 39
5.11.3 Results . 39
5.12 Vertical load on the terminal . 39
5.12.1 Test assembly . 39
5.12.2 Procedure . 39
5.12.3 Test results . 39
5.13 Thermal resistance for the air intake of the chimney and terminal . 39
5.13.1 Procedure . 39
5.13.2 Calculation of the thermal resistance of the flue duct . 40
5.13.3 Calculation of the thermal resistance between the supply air and the ambient air . 44
6 Assessment and verification of constancy of performance – AVCP . 46
6.1 General . 46
6.2 Type testing . 46
6.2.1 General . 46
6.2.2 Test samples, testing and compliance criteria . 47
6.3 Factory production control (FPC) . 52
6.3.1 General . 52
6.3.2 Characteristics . 53
6.3.3 Product specific characteristics . 55
6.3.4 Initial inspection of factory and of FPC . 55
6.3.5 Continuous surveillance of FPC . 56
6.3.6 Procedure for modifications . 56
6.3.7 One-off components, pre-production products (e.g. prototypes) and components
produced in very low quantity . 56
7 Product classification and designation . 57
7.1 Manufacturer's instructions . 57
7.2 Minimum information to be included in the manufacturer’s documentation and
instructions . 57
7.3 Classification and designation . 59
8 Marking, labelling and packaging . 59
8.1 Chimney sections, fittings or terminals . 59
8.2 Chimney plate . 60
8.3 Packaging . 60
Annex A (normative) Corrosion test. 61
A.1 Sampling and preconditioning . 61
A.2 Test methods . 62
A.3 Evaluation . 64
A.4 Test report . 66
Annex B (normative) Sampling for factory production control . 71
B.1 Incoming material . 71
B.2 In-process inspection . 72
Annex C (normative) Factory production control . 73
C.1 General . 73
C.2 Insulation material . 73
C.3 Metals, including coatings . 73
C.4 Supports . 73
C.5 Seals and sealants . 73
C.6 Manufacturing checks . 74
Annex D (informative) Method for applying an evenly distributed load (horizontal) . 75
Annex E (normative) Simplified calculation of thermal resistance for circular flues . 76
Annex ZA (informative) Relationship of this European Standard with Regulation (EU)
No.305/2011 . 78
ZA.1 Scope and relevant characteristics . 78
ZA.2 System of Assessment and Verification of Constancy of Performance (AVCP) . 81
ZA.3 Assignment of AVCP tasks . 82
Bibliography . 84

European foreword
This document (prEN 1856-1:2019) 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.
For relationship with EU Regulation(s), see informative Annex ZA, which is an integral part of this
document.
This document will supersede EN 1856-1:2009, EN 1859:2009+A1:2013, EN 14989-1:2007 and
EN 14989-2:2007.
The main changes to EN 1856-1:2009 are:
— adoption of the template for harmonized standards under the EU Construction Products Regulation
(305/2011/EU) meaning a clearer definition of the Scope, rewording in Clause 4 "Product
characteristics", Clause 5 "Testing, assessment and sampling methods" and Clause 7 "Product
classification and designation", and adoption of the template for Clause 6 "Assessment and
verification of constancy of performance";
— adoption of a new revised Annex A "Corrosion tests".
Introduction
The generic word "chimney", when used in this document, refers to systems with metallic liner used to
convey the products of combustion from combustion appliances to the outside atmosphere, and thus
includes all other terms of common use in the trade, such as vents, flues, shafts, exhaust systems, ducts,
etc.
For addressing the durability against corrosion, a unique corrosion test has been introduced in Annex A;
the material table with minimum material specification of the former edition has been taken over.
This document describes chimney components, from which system chimneys can be assembled.
1 Scope
This document specifies the characteristics of performance for single and multi-wall system chimney
products with rigid metal liners (chimney sections, chimney fittings and terminals, including supports)
with nominal diameter up to and including 1 200 mm, used to convey the products of combustion from
appliances to the outside atmosphere.
This document also specifies characteristics for the air supply ducts of concentric chimneys for room-
sealed application. Additionally, it specifies the characteristics for marking, manufacturer's instructions,
product information and assessment and verification of constancy of performance (AVCP). Metal liners
and metal connecting flue pipes not covered here are included in prEN 1856-2:2019.
This document does not apply to structurally independent (free standing or self-supporting) chimneys.
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 573-3:2013, Aluminium and aluminium alloys – Chemical composition and form of wrought products –
Part 3: Chemical composition and form of products
EN 1443:2019, Chimneys – General requirements
EN 10088-1:2014, Stainless steels – Part 1: List of stainless steels
EN 13216-1:2019, Chimneys — Test methods for system chimneys — Part 1: General test - Methods
1)
EN 13384-1:2015, Chimneys – Thermal and fluid dynamic calculation methods – Part 1: Chimneys serving
one appliance
EN 14241-1:2013, Chimneys — Elastomeric seals and elastomeric sealants — Material requirements and
test methods — Part 1: Seals in flue liners
EN 14471:2013+A1:2015, Chimneys — System chimneys with plastic flue liners — Requirements and test
methods
EN 60068-2-57:2013, Environmental testing — Part 2-57: Tests — Test Ff : Vibration — Time-history and
sine-beat method (IEC 60068-2-57:2013)
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1443:2019 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

1) This document is impacted by the amendment EN 13384-1:2015/prA1.
3.1
appliance outlet
position where the products of combustion exit from the appliance
3.2
balanced flue terminal
terminal unit consisting of a flue duct, which may be provided with a cover, and an air supply duct for the
connection of a room sealed appliance
3.3.1
chimney
structure consisting of a wall or walls enclosing a flue or flues conveying the products of combustion into
the outside atmosphere
Note 1 to entry: The generic word “chimney”, when used in this standard, refers to chimneys used to convey the
products of combustion from any combustion appliance to the outside atmosphere, and thus includes all other
terms of common use, such as: vents, flues, shafts, exhaust systems, flue ducts, etc.
[SOURCE: EN 1443:2019, 3.5]
3.3.2
chimney accessory
additional flue gas carrying component added to a chimney or a connecting flue pipe to perform a
particular function
3.3.3
chimney component
any part of a chimney, of a flue liner or of a connecting flue pipe
3.4
chimney designation
shortened description of a specific chimney type, which clearly distinguishes it from any other types
3.5
chimney fitting
component of a chimney, of a flue liner or of a connecting flue pipe conveying products of combustion
except a section
3.6
chimney section
straight chimney component of a flue liner or of a connecting flue pipe, conveying products of combustion
3.7
cladding
additional non-structural outer wall around a chimney for protection against heat transfer or weathering,
or for decorative purposes
3.8
concentric chimney
flue duct fully surrounded by the air supply duct
3.9
connecting flue pipe
component or components connecting the heating appliance outlet and the chimney
[SOURCE: EN 1443:2019, 3.8]
3.10
corrosion load
combination of condensate and corrosion resistance classes necessary for the different operating
conditions and types of fuel
3.11
custom built chimney
chimney that is installed or built on-site using a combination of compatible chimney components that
may be from one or different sources
[SOURCE: EN 1443:2019, 3.20]
3.12
design load (DL)
load which a chimney or its components are designed to be subjected to, under normal operating
conditions, when installed as per manufacturer's installation instruction
3.13
dry operating condition
condition when the chimney is designed to operate normally with the temperature of the inner surface
of the flue liner at or above the water dew point
Note 1 to entry: Dry operating condition is designated "D".
[SOURCE: EN 1443:2019, 3.29]
3.14
enclosure
additional structure, combustible or non-combustible, built around a chimney
Note 1 to entry: An enclosure which is specified as a part of the chimney is considered an “outer wall” of the chimney.
Note 2 to entry: Enclosures can for example give additional safety in case of fire, provide additional heat transfer
resistance, prevent accidental human contact, prevent impact damage and can be used for decorative purposes.
[SOURCE: EN 1443:2019]
3.15
external installation
part of a chimney, which is located outside the building
3.16
firestops
barrier to prevent the spread of fire
3.17
flexible pipe
metal liner, or metal connecting flue pipe having a single or double skin construction, designed to bend
in any direction without permanent deformation
3.18
flue
passage for conveying the products of combustion to the outside atmosphere
[SOURCE: EN 1443:2019, 3.2]
3.19
flue gas
gaseous portion of the products of combustion conveyed in a flue
[SOURCE: EN 1443:2019, 3.3]
3.20
metal flue liner
inner wall of a chimney consisting of components the surface of which is in contact with products of
combustion
3.21
combustion appliances
unit generating products of combustion which need to be conveyed to the outside atmosphere
Note 1 to entry: E.g. heating appliances, cooking appliances, motors, CHPs (Combined Heat and Power).
3.22
insulation
material or air gap between the flue liner and the outer wall, designed to increase thermal resistance of
the chimney
3.23
internal installation
part of a chimney which is located inside a building
3.24
joint
connection between two components
[SOURCE: EN 1443:2019, 3.15]
3.25
manufacturer instructions
product written information which is provided for use by the buyer or installer
3.26
metal chimney
chimney with its flue liner made of metal, which may have additional surrounding structural elements
and accessories, as well as insulation
3.27
minimum declared wall thickness
value declared for the minimum thickness, after manufacturing of the walls
3.28
multi-wall chimney
chimney consisting of a flue liner and at least one additional wall
[SOURCE: EN 1443:2019, 3.18]
3.29
multi-wall metal chimney
chimney of two walls or more, all made of metal
3.30
negative pressure chimney
chimney designed to operate with the pressure inside the flue equal or less than the pressure outside the
flue
Note 1 to entry: The class for negative pressure is "N".
[SOURCE: EN 1443:2019, 3.26]
3.31
nominal size
whole number representing the value of the internal diameter of the flue liner, expressed in millimetres
3.32
non enclosed chimney
chimney which is installed without any enclosure or cladding
3.33
outer wall
external wall of a chimney from the surface of which the distance to combustible material is measured
[SOURCE: EN 1443:2019]
3.34
positive pressure chimney
chimney designed to operate with the pressure inside the flue greater than the pressure outside the flue
Note 1 to entry: Classes for positive pressure are e.g. "P", "M", "H".
[SOURCE: EN 1443:2019, 3.27]
3.35
relining
process of restoring or replacing the flue liner of a chimney
[SOURCE: EN 1443:2019, 3.21]
3.36
resistance to fire
ability of a chimney to prevent ignition of adjacent combustible material, and to prevent the spread of fire
to adjacent areas
3.37
single-wall chimney
chimney with only one wall
[SOURCE: EN 1443:2019, 3.17]
3.38
sootfire
combustion of the flammable residue deposited on the flue liner
[SOURCE: EN 1443:2019, 3.31]
3.39
structurally independent chimney
chimney which is not attached to buildings, masts or other support structure
3.40
support
chimney accessory used to fix, or transfer the load of, chimney components to structural elements
(building, mast, etc.)
3.41
system chimney
chimney that is installed using a combination of compatible chimney components, obtained or specified
from one manufacturing source with product responsibility for the whole chimney
[SOURCE: EN 1443:2019, 3.19]
3.42
terminal
component installed at the outlet of a chimney or a flue liner
Note 1 to entry: There are terminals only for decorative purposes or terminals intended for specified
performances.
[SOURCE: EN 1443:2019, 3.14]
3.43
test assembly
complete assembly of all parts necessary to enable the specific performance criteria to be assessed,
comprising test chimney, test structures, and measuring equipment (as specified in the test method)
3.44
test chimney
assembly of the chimney components (as specified in the test method), necessary to the assessment of a
specific performance criteria of a metal system chimney product
3.45
test structure
assembly of the additional materials (non-chimney components) to enable the test chimney to be
assessed for the specific performance criteria
3.46
thermal resistance of a chimney
resistance to heat transfer through the wall or walls of the chimney
Note 1 to entry: The thermal resistance of a chimney is given as (1/Λ).
[SOURCE: EN 1443:2019, 3.36]
3.47
wet operating condition
condition when the chimney is designed to operate normally with the temperature of the inner surface
of the flue liner below the water dew point
Note 1 to entry: Wet operating condition is designated "W".
Note 2 to entry: The characteristic "W" is not related to rainwater ingress.
[SOURCE: EN 1443:2019, 3.30]
3.48
nominal working temperature
flue gas temperature under normal operating conditions of the combustion appliance at maximum heat
input as specified in the appliance product standards
[SOURCE: EN 1443:2019, 3.2.5]
4 Product characteristics
4.1 General
These product characteristics apply to products, which have been designed as a liner or connecting flue
pipe as well as to chimneys according to prEN 1856-1:2019, which are used as a liner or connecting flue
pipe.
Unless otherwise stated, performance characteristics for fittings shall be the same as those for chimney
sections.
4.2 Dimensions and tolerance
4.2.1 The thickness of the material from which the components are made shall be not less than the
minimum declared wall thickness. The tolerance for material thickness shall not be more than ± 10 % of
the nominal thickness.
4.2.2 The declared internal diameter of the fitting or section shall be not less than ± 5 mm from the
nominal size. The measured internal diameter of the fitting or section shall not be less than the diameter
declared.
4.2.3 The external circumference of the liner of the fitting or section shall be within the following
tolerances:
+5
— mm up to 600 mm internal diameter;
+13
— mm above 600 mm internal diameter.
4.2.4 The installed length of a fitting or section (measured on an assembly including at least one joint)
shall be within ± 5 mm of the declared value.
+30
4.2.5 The density of insulation in a fitting or a section shall be within % of the declared value.
4.3 Mechanical resistance and stability
4.3.1 Compressive strength
4.3.1.1 Chimney sections and fittings
The design loads shall be declared.
When tested according to the test method described in 5.2.1 a multi-wall chimney section or fitting shall
withstand a load of at least three times the declared design load.
When tested according to the test method described in 5.2.1, single- and multi-wall chimney sections or
fittings where the flue liner is load bearing, shall withstand a load of at least four times the declared design
load.
4.3.1.2 Chimney support
The design loads shall be declared.
When tested according to the test method described in 5.2.2, the maximum displacement of the test
chimney at the support shall not be greater than 5 mm, in the direction of the load when the declared
design load is applied.
The support shall withstand an intensity of loading of at least three times the declared design load.
4.3.2 Tensile strength
The design loads shall be declared.
When a chimney section is tested according to the test method described in 5.3, the chimney section shall
withstand a load of at least 1,5 × the declared design load.
4.3.3 Lateral strength
4.3.3.1 Non-vertical installation
When a chimney section, declared as suitable for non-vertical installation, is tested according to the test
method described in 5.4.1, the deflection of any part of the test chimney shall not be more than 2 mm/m
of length of the maximum declared length between supports.
4.3.3.2 Components subject to wind load
When components, declared as suitable for external installation, are tested according to the test method
of 5.4.2, the test chimney shall withstand a minimum load of 1,5 kN/m of projected outer surface area.
4.4 Reaction to fire
The reaction to fire shall be declared for flue liners and chimney terminals. Classification may be carried
out via testing according to the relevant product standard and in accordance with EN 13501-1.
NOTE Metal liners and chimney terminals might be classified A1 according to Commission Decision
[96/603/EC (2)] and need no further testing.
4.5 Resistance to fire
4.5.1 Resistance to fire (external to external)
When declared, the resistance to fire external to external, shall be assessed in accordance with
EN 1443:2019.
4.5.2 Sootfire resistance classes
The sootfire resistance class of the chimney or product shall be declared.
Sootfire resistance classes are:
— O for chimneys, flue liners, connecting flue pipes, components and accessories without sootfire
resistance;
— G for chimneys, flue liners, connecting flue pipes, components and accessories with sootfire
resistance.
For a sootfire resistant chimney, the characteristics of 4.5.3 shall be fulfilled. Under a declared normal
operating condition, the characteristics of 4.5.4 shall be fulfilled for the designated temperature class (see
Table 3). Additionally for both classes G and O, the gas tightness given in 4.6 shall be met.
4.5.3 Sootfire resistance
When a chimney made of sections and/or fittings designated as sootfire resistant is tested according to
the sootfire resistance test method described in 5.5, the maximum surface temperature of combustible
materials adjacent to the test chimney, at the distance declared, shall not exceed 100 °C when related to
an ambient temperature of 20 °C.
Where a chimney is designated sootfire resistant, it shall comply with the characteristics for the thermal
performance at normal operating conditions as described in 4.5.4 before and after the sootfire resistance
test to check the durability of any thermal insulation in soot fire condition.
The distance declared shall not exceed the criteria for normal operating conditions.
The chimney to be tested shall be the largest diameter in the manufacturer’s range, up to and including
200 mm. The distance to combustible material for chimneys larger than that tested shall be increased by
a factor. For diameters from 201 mm to 300 mm the factor shall be 1 time the distance to combustible
material determined for the 200 mm product, for diameters from 301 mm to 450 mm the factor shall be
1.5, and those diameters from 451 mm to 600 mm shall apply a factor of 2, and above 600 mm the factor
shall be 4.
4.5.4 Thermal performance under normal operating conditions
When a chimney made of sections and/or fittings is tested according to the normal operating conditions
described in 5.5, the maximum surface temperature of combustible materials adjacent to the test
chimney, at the distance declared by the manufacturer, for the designated temperature class (see
Table 3), shall not be greater than 85 °C, when related to an ambient temperature of 20 °C.
For concentric chimneys it shall be declared if the chimney was tested for use as concentric balanced flue
system for room-sealed appliances or tested for use as a chimney for non-room-sealed appliances.
The chimney to be tested shall be the largest in the manufacturer’s range, up to and including 200 mm.
The distance to combustible material for chimneys larger than that tested shall be increased by a factor.
For diameters from 201 mm to 300 mm the factor shall be 1 time the distance to combustible material
determined for the 200 mm value; for diameters from 301 mm to 450 mm factor shall be 1.5, and those
diameters from 451 mm to 600 mm shall apply a factor of 2, and above 600 mm the factor shall be 4.
In addition, for positive pressure chimneys, and negative pressure chimneys which incorporate a seal or
sealant as part of the joint, the elongation of the test chimney measured after subjecting the test chimney
to the cycling criteria of 5.5.1, shall not exceed 5 mm, and meet the gas tightness given in 4.6.
In addition after the test no part of the chimney or its components shall show any permanent
deformation, blisters or cracks which could affect its performance.
4.6 Hygiene, health and environment, gas tightness
When a chimney is tested for gas tightness according to the test methods described in EN 13216-1:2019,
5.4, the leakage rate shall not be greater than that given in Table 1, both before and after the thermal
performance test at normal operating condition and, where appropriate, the resistance to sootfire test.
For positive pressure systems a gas tightness test shall also be performed on other diameters than that
for thermal testing. It shall be undertaken on the smallest, largest and one diameter in between, using
two chimney sections with a joint, not subjected to thermal testing.
Table 1 — Leakage rate
a
Pressure Pressure Type of use Test Leakage rate
Class pressure −1 −2
Pa l · s · m
N 1 ≤ 0 for negative pressure chimneys 40 ≤ 2,0
N 2 ≤ 0 for negative pressure chimneys 20 ≤ 3,0
P 1 ≤ 200 for low positive pressure chimneys 200 ≤ 0,006
P 2 ≤ 200 for low positive pressure chimneys 200 ≤ 0,120
M 1 ≤ 1 500 for medium positive pressure 1 500 ≤ 0,006
chimneys
M 2 ≤ 1 500 for medium positive pressure 1 500 ≤ 0,120
chimneys
H 1 ≤ 5 000 for high positive pressure chimneys 5 000 ≤ 0,006
H 2 ≤ 5 000 for high positive pressure chimneys 5 000 ≤ 0,120
a
Pressure at steady-state condition under normal operating conditions.
4.7 Safety in use
4.7.1 Accidental human contact
Where the surface temperature of a chimney, when measured during the thermal tests of 4.5.4, exceeds
the values in Table 2 and where accidental human contact is possible, then the manufacturer shall specify
that the chimney shall be protected from touching.
Table 2 — Maximum outer wall surface temperatures
Material of outer wall surface Maximum allowed temperature
°C
Metal-bare 70
Metal-painted 50 µm 80
4.7.2 Thermal resistance
The thermal resistance value of the chimney section declared by the manufacturer shall be verified either
by testing, according to the test method of EN 13216-1:2019, 5.8 (being the reference value), or by
calculation using the simplified calculation
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