BRITISH STANDARD Chimneys — Requirements for metal chimneys Part 1: System chimney products ICS 91.060.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 1856-1:2009 BS EN 1856-1:2009 National foreword This British Standard is the UK implementation of EN 1856-1:2009 It supersedes BS EN 1856-1:2003 which is withdrawn BS EN 1856-1:2003 superseded BS 4543-2:1990 and BS 4543-3:1990, and those requirements and recommendations relating to chimneys that were removed from BS 715:19931 BS 715:1993 was amended and republished as BS 715:2005 leaving only requirements relating to flue boxes The UK participation in its preparation was entrusted by Technical Committee B/506, Chimneys, to its Subcommittee B/506/5, Chimneys and their components having inner linings of metal A list of organizations represented on this subcommittee can be obtained on request to its secretary EN 1856-1 is a candidate “harmonized” European standard and fully takes into account the requirements of the European Commission mandate M/105, Chimneys, flues and specific products, given under the EU Construction Products Directive (89/106/EEC), and intended to lead to CE marking The date of applicability of EN 1856-1 as a "harmonized" European standard, i.e the date after which this standard may be used for CE marking purposes, is subject to an announcement in the Official Journal of the European Communities EN 1856-1 is the subject of transitional arrangements agreed under the European Commission mandate The Member States have agreed a nominal transition period for the co-existence of EN 1856-1 and their corresponding national standard(s) It is intended that this period will comprise a nominal nine month period during which any required changes to national regulations are to be made, followed by a further nominal twelve month period for the implementation of CE marking At the end of this co-existence period, the national standard(s) will be withdrawn In the UK there are no corresponding national standards Clauses NA.1 to NA.5 of National annex NA (informative) identify the specifications previously required in BS 4543-2:1990, BS 4543-3:1990 and BS 715:1993 for chimneys Clause NA.5 identifies the chimney test arrangement and fire-stop recommendations, and Clause NA.6 provides recommendations for chimney ridge terminals under wind load This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application Compliance with a British Standard cannot confer immunity from legal obligations This British Standard was published under the authority of the Standards Policy and Strategy Committee on 30 April 2010 © BSI 2010 ISBN 978 580 60025 BS EN 1856-2:2004 also partially superseded BS 715:1993 Amendments/corrigenda issued since publication Date Comments EUROPEAN STANDARD EN 1856-1 NORME EUROPÉENNE EUROPÄISCHE NORM June 2009 ICS 91.060.40 Supersedes EN 1856-1:2003 English Version Chimneys - Requirements for metal chimneys - Part 1: System chimney products Conduits de fumèe - Prescriptions pour les conduits de fumèe mètalliques - Partie 1: Composants de systèmes de conduits de fumèe Abgasanlagen - Anforderungen an Metall-Abgasanlagen Teil 1: Bauteile für System-Abgasanlagen This European Standard was approved by CEN on May 2009 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 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 Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2009 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 1856-1:2009: E BS EN 1856-1:2009 EN 1856-1:2009 (E) Contents Page Foreword Introduction Scope Normative references Terms and definitions Manufacturer’s declaration for type test 13 Dimensions and tolerances 14 6.1 6.2 6.2.1 6.2.2 6.2.3 6.3 6.4 6.5 6.6 6.6.1 6.6.2 6.6.3 6.6.4 6.6.5 6.6.6 6.6.7 6.6.8 6.7 6.7.1 6.7.2 6.7.3 6.7.4 Performance requirements 14 General 14 Mechanical resistance and stability 14 Compressive strength 14 Tensile strength 15 Lateral strength 15 Resistance to fire (internal to external) 15 Sootfire resistance 15 Hygiene, health and environment, gas tightness 15 Safety in use 16 Thermal performance at normal operating conditions 16 Accidental human contact 16 Thermal resistance 17 Water vapour diffusion resistance 18 Condensate penetration resistance 18 Rainwater penetration resistance 18 Flow resistance 18 Other requirements for terminals 18 Durability 19 Durability of the flue liner against corrosion 19 Flue liner material specification 19 Freeze-thaw resistance 20 Flue liner seals 20 7.1 7.2 Product information 21 Manufacturer's instructions 21 Minimum information to be included in the manufacturer’s documentation and instructions 21 8.1 8.2 8.3 8.4 Marking 22 General 22 Chimney sections, fittings or terminals 22 Chimney plate 22 Packaging 23 Product designation 23 10 10.1 10.2 10.2.1 10.2.2 10.2.3 Evaluation of conformity 23 General 23 Type testing 24 Initial type testing 24 Further type testing 24 Sampling for type testing 24 BS EN 1856-1:2009 EN 1856-1:2009 (E) 10.3 10.3.1 10.3.2 10.3.3 10.3.4 10.3.5 Factory production control (FPC) 24 General 24 Equipment 25 Raw materials and components 26 Product testing and evaluation 26 Non conforming products 26 Annex A.1 A.1.1 A.1.2 A.1.3 A.1.4 A.1.5 A.1.6 A.2 A.2.1 A.2.2 A.2.3 A.2.4 A.2.5 A.2.6 A.3 A.3.1 A.3.2 A.3.3 A.3.4 A.3.5 A.3.6 A (normative) Corrosion tests 27 Corrosion test method for products designated V1 27 General 27 Pass/Fail criteria 27 Sampling 27 Test methods 27 Evaluation 31 Test report 32 Corrosion test method for products designated V2 35 General 35 Pass/Fail criteria 35 Sampling 35 Test methods 35 Evaluation 37 Test report 38 Corrosion test method for products designated V3 39 General 39 Pass/Fail criteria 39 Sampling 40 Test methods 40 Evaluation 43 Test report 43 Annex B (normative) Choice of size for type test and sampling 46 Annex C (normative) Sampling for factory production control 47 C.1 Incoming material 47 C.1.1 Sampling plans 47 C.1.2 Acceptable quality level (AQL) 47 C.1.3 Normal, tightened or reduced inspection 47 C.1.4 Single, double, multiple or sequential sampling 47 C.1.5 Batch quantity 47 C.1.6 The inspection level 47 C.2 In-process inspection 48 C.2.1 All dimensional aspects 48 C.2.2 Joint leakage tests 48 C.2.3 Insulation weight checks 48 C.2.4 Volume and density checks 48 C.2.5 Finished goods checks 48 Annex D (normative) Factory production control 49 D.1 General 49 D.2 Insulation material 49 D.3 Metals, including coatings 49 D.4 Supports 49 D.5 Seals and sealants 49 D.6 Manufacturing checks 50 D.6.1 Dimensions 50 D.6.2 Other checks 50 Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU Construction Products Directive 51 ZA.1 Scope and relevant characteristics 51 ZA.2 Procedure(s) for attestation of conformity of metal system chimneys 53 ZA.2.1 System(s) of attestation of conformity 53 BS EN 1856-1:2009 EN 1856-1:2009 (E) ZA.2.2 EC Declaration of conformity 54 ZA.3 CE marking and labelling 55 Bibliography 61 BS EN 1856-1:2009 EN 1856-1:2009 (E) Foreword This document (EN 1856-1:2009) has been prepared by Technical Committee CEN/TC 166 “Chimneys”, the secretariat of which is held by UNI 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 December 2009, and conflicting national standards shall be withdrawn at the latest by March 2011 Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights This document supersedes EN 1856-1:2003 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 EC Directive 89/106/EEC For relationship with EC Directive 89/106/EEC, see informative Annex ZA, which is an integral part of this document According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom BS EN 1856-1:2009 EN 1856-1:2009 (E) Introduction This European Standard has been prepared to be a harmonised standard to provide means of conforming to the essential requirements of the Construction Products Directive and associated EFTA regulations The generic word "chimney", when used in this European Standard, refers to systems with metallic liner used to convey the products of combustion from any appliance 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 This European Standard addresses the durability against corrosion by the use of a minimum material specification for the flue liner as well as an interim solution for testing products for durability against corrosion Three corrosion resistance tests and their requirements have been adopted from existing corrosion testing being undertaken in various member states (see Annex A) This European Standard describes chimney components, from which system chimneys can be assembled as illustrated in Figure BS EN 1856-1:2009 EN 1856-1:2009 (E) Scope 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 Normative references The following referenced documents are indispensable for the application 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, Aluminium and aluminium alloys – Chemical composition and form of wrought products – Part 3: Chemical composition and form of products EN 1443:2003, Chimneys – General requirements EN 1859, Chimneys – Metal chimneys – Test methods EN 10088-1, Stainless steels – Part 1: List of stainless steels EN 13384-1, Chimneys – Thermal and fluid dynamic calculation methods – Part 1: Chimneys serving one appliance EN 14241-1, Chimneys - Elastomeric seals and elastomeric sealants Material requirements and test methods - Part 1: Seals in flue liners EN 15287 (all parts), Chimneys – Design, installation and commissioning of chimneys EN ISO 3651-2, Determination of resistance to intergranular corrosion of stainless steels Part 2: Ferritic, austenitic and ferritic-austenitic (duplex) stainless steels Corrosion test in media containing sulfuric acid (ISO 3651-2:1998) ISO 2859-1, Sampling procedures for inspection by attributes – Part 1: Sampling schemes indexed by acceptance quality limit (AQL) for lot-by-lot inspection Terms and definitions For the purposes of this document, the following terms and definitions apply 3.1 appliance outlet position where the products of combustion exit from the appliance (see Figure 1) 3.2 chimney structure consisting of a wall or walls enclosing a flue or flues [EN 1443:2003] BS EN 1856-1:2009 EN 1856-1:2009 (E) 3.2.1 chimney accessory chimney component not conveying products of combustion [EN 1443:2003] 3.2.2 chimney component any part of a chimney [EN 1443:2003] 3.3 chimney designation shortened description of a specific chimney type, which clearly distinguishes it from any other types 3.4 chimney fitting chimney component conveying products of combustion except a chimney section (see Figure 1) [EN 1443:2003] 3.5 chimney section straight chimney component conveying products of combustion (see Figure 1) [EN 1443:2003] 3.6 cladding additional non-structural outer wall around a chimney for protection against heat transfer or weathering, or for decorative purposes (see Figure 1) [EN 1443:2003] 3.7 connecting flue pipe component or components connecting the heating appliance outlet and the chimney (see Figure 1) [EN 1443:2003] 3.8 corrosion load combination of condensate and corrosion resistance classes necessary for the different operating conditions and types of fuel 3.9 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 [EN 1443:2003] 3.10 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 BS EN 1856-1:2009 EN 1856-1:2009 (E) CE conformity marking, consisting of the “CE”-symbol given in directive 93/68/EEC Identification number of the notified body 01234 AnyCo Ltd, PO Box 21, B-1050 08 01234-CPD-00234 EN 1856-1:2009 Metal system chimney section Multi-wall type XXXXYYY Name or identifying mark and registered address of the manufacturer Last two digits of the year in which the marking was affixed Certificate number Number of dated version of European Standard Definition of the product and product identification/code T400 - N2 – D - Vm - L50045- G 50 Compressive strength Maximum load: 30 m of chimney sections And appropriate designation according to clause Flow resistance Mean value of roughness: 0,1 mm Thermal resistance 0,22 w/m²K at designation temperature Information on mandated characteristics not included in the designation or threshold values to be given (see Table ZA.1) Thermal shock resistance: Yes Flexural strength Tensile strength: m Non-vertical installations: Maximum offset between supports: m at 45° Wind load: Free standing height: 1,5 m above last support Maximum spacing of lateral supports: m Freeze thaw resistance: Yes Figure ZA.2 — Example of CE marking information on the accompanying documents: Example for a chimney section 58 BS EN 1856-1:2009 EN 1856-1:2009 (E) CE conformity marking, consisting of the “CE”-symbol given in directive 93/68/EEC 01234 AnyCo Ltd, PO Box 21, B-1050 08 Identification number of the notified body Name or identifying mark and registered address of the manufacturer Last two digits of the year in which the marking was affixed Certificate number 01234-CPD-00234 EN 1856-1:2009 Number of dated version of European Standard Metal system chimney fitting Single-wall T piece Definition of the product T250 – P1 - W – V2 - L60060 - O 50 Compressive strength And appropriate designation according to clause Maximum load: 30 m of chimney sections Flow resistance Coefficient of friction: 0,3 for 90° change of direction Information on mandated characteristics not included in the designation or threshold values to be given (see Table ZA.1) Thermal resistance 0,22 w/m²K at designation temperature Thermal shock resistance: NPD Flexural strength Tensile strength: m Non-vertical installations: NPD Wind load: Free standing height: NPD Freeze thaw resistance: Yes Figure ZA.3 — Example for a chimney fitting T-piece in the accompanying documents 59 BS EN 1856-1:2009 EN 1856-1:2009 (E) CE conformity marking, consisting of the “CE”-symbol given in directive 93/68/EEC AnyCo Ltd, PO Box 21, B-1050 08 EN 1856-1:2009 Name or identifying mark and registered address of the manufacturer Last two digits of the year in which the marking was affixed Number of dated version of European Standard Metal system chimney fitting Definition of the product Terminal and appropriate designation according to clause Flow resistance Coefficient of friction: 0.5 Information on mandated characteristics not included in the designation or threshold values to be given (see Table ZA.2) Figure ZA.4 — Example of a chimney fitting Terminal in the accompanying documents In addition to any specific information relating to dangerous substances shown above, the product should also be accompanied, when and where required and in the appropriate form, by documentation listing any other legislation on dangerous substances for which compliance is claimed, together with any information required by that legislation NOTE European legislation without national derogations need not be mentioned NOTE Affixing the CE marking symbol means, if a product is subject to more than one directive, that it complies with all applicable directives 60 BS EN 1856-1:2009 EN 1856-1:2009 (E) Bibliography [1] EN ISO 13732-1, Ergonomics of the thermal environment - Methods for the assessment of human responses to contact with surfaces - Part 1: Hot surfaces (ISO 13732-1:2006) [2] EN 1856-2:2009, Chimneys - Requirements for metal chimneys - Part 2: Metal liners and connecting flue pipes [3] EN ISO 8044, Corrosion of metals and alloys - Basic terms and definitions (ISO 8044:1999) [4] EN ISO 9001:2008, Quality management systems - Requirements (ISO 9001:2008) 61 BS EN 1856-1:2009 National annex (informative) Recommendations for flue linings, outer casing, firestop and spacer, and flue terminals NA.1 Flue linings and end caps for use with appliances burning solid fuel and having a rated output up to 45 kW The material for a flue lining and end-caps should be stainless steel sheet conforming to type B in Table NA.1 The sheet should have a minimum specified thickness of 0.4 mm and the tolerance on the specified thickness should conform to BS EN 10259:1997, Table When the design of the section is such that the end-cap is not in contact with the flue products the material of manufacture should conform to any of the stainless steel types given in Table NA.1 The sheet should have a minimum specified thickness of 0.3 mm and the tolerance on the specified thickness should conform to BS EN 10259:1997, Table Table NA.1 — Compositions of stainless steels Stainless steel type A Composition (percentage by mass) C Si Mn P S Cr Mo Max Max Max Max Max Min Max Min 0.07 1.0 2.0 0.045 0.015 17.0 19.5 — 0.03 1.0 2.0 0.045 0.015 16.5 18.5 0.07 1.0 2.0 0.045 0.015 16.5 18.5 Designation of EN 10088-1 steel which conform Ni Max Min Max — 8.0 10.5 2.0 3.0 10.0 13.0 2.0 3.0 10.0 13.0 B NOTE 1.4301 1.4307 1.4404 1.4432 1.4401 1.4436 See Table for correlation of stainless steel grades shown above NA.2 Outer casing The material and minimum thickness of the outer casing, to be used for terminal chimney sections exposed to the external environment, should be in accordance with NA.1 Chimney sections not exposed to the external environment should be fabricated with outer casings which conform to either NA.1 or Table NA.2 Any accessory which comes in contact with the outer casing, which is exposed to the external environment, should be manufactured from the materials listed in Table NA.2 BS EN 1856-1:2009 Table NA.2 — Materials and minimum thickness of the outer casings of chimney sections not exposed to the external environment Metal Minimum thickness including coating mm Hot-dip zinc coated steel sheet and coil conforming to BS EN 10142:1991, steel grade DX51D, coating Z275-N-C-C minimum 0.5 Hot dip aluminium/silicon coated steel strip and sheet conforming to BS EN 10154:2002 steel grade DX51D, coating AS 120-C-C 0.5 NA.3 Flue linings and end-caps for use with appliances burning oil and having a rated output to 45 kW with a flue gas temperature not exceeding 450° at the exit to the appliance The material for a flue lining and end-caps should be stainless sheet of the types given in Table NA.1 The sheet should have a minimum specified thickness of 0.4 mm and the tolerance on the specified thickness should conform to BS EN 10259:1997, Table When the design of the section is such that the end-cap is not in contact with the flue gas products the sheet should have a minimum specified thickness of 0.3 mm and the tolerance on the specified thickness should conform to BS EN 10259:1997, Table NA.3.1 Outer casing The material and minimum thickness of the outer casing, to be used for terminal chimney sections exposed to the external environment should be in accordance with NA.3 Chimney sections not exposed to the external environment should be fabricated with outer casings which conform to either NA.3 or Table NA.3 Any accessory which comes in contact with an outer casing which is exposed to the external environment should be manufactured from the materials listed in Table NA.1 BS EN 1856-1:2009 Table NA.3 — Material and minimum thickness of outer casings of chimney sections not exposed to the external environment Metal Minimum thickness including coating mm Hot-dip zinc coated steel sheet conforming to BS EN 10143 0.5 Aluminium coated steel sheet, the coating to be not less than 115 g/m2 on each side 0.5 Aluminium-zinc coated steel conforming to BS EN 10215 0.5 NA.4 Chimney components for gas fired appliances NA.4.1 Single wall flue system All pipes, fittings and accessories should be manufactured from materials which in combination will not cause bimetallic corrosion and hence adversely affect the integrity of the flue system The sheet metal should be of steel or aluminium conforming to the following grades a) Steel sheet should be of one of the grades specified in BS EN 10088-1 b) Stainless steel sheet should be of one of the following grades as specified in BS EN 10088-1: 1.4301 1.4404 1.4571 1.4432 1.4438 1.4401 1.4436 c) Sheet aluminium should be aluminium conforming to BS EN 1856-1:2009, Table The sheet metal should be smooth and free from surface or other defects Prior to the application of any protective coating the sheet metal should be of a thickness of not less than 0.70 mm for steel and 1.00 mm for aluminium BS EN 1856-1:2009 NA.4.2 Double wall flue system NA.4.2.1 General The pipes, both inner and outer, and end-caps should be manufactured from materials which in combination will not cause bimetallic corrosion and hence adversely affect the integrity of the flue system NA.4.2.2 Inner pipe The inner pipe should be made of aluminium conforming to BS EN 1856-1:2009, Table 4, or of stainless steel conforming to BS EN 10088-1, as listed in NA.4.1 b) and should be not less than 0.30 mm thick NA.4.2.3 Outer pipe For external and internal use the outer pipe should be one of the following materials: a) Aluminium conforming to BS EN 1856-1:2009, Table 4; b) Aluminium alloy conforming to BS EN 1856-1:2009, Table 4; c) Stainless steel conforming to BS EN 10088-1; or d) Aluminium/zinc alloy coated steel of grades ZA 1, ZA or ZA with coating conforming to BS EN 10215 For internal use only, the outer pipe should be of one of the following materials: a) Hot-dip zinc coated steel sheet of steel grade FePO2G with coating type Z600 as specified in BS EN 10327:2004; b) Hot-dip zinc coated steel sheet of steel grade FePO2G or FePO3G with coating type Z275 as specified in BS EN 10327:2004; c) Aluminium coated steel, consisting of steel base conforming to the appropriate section of BS 1449-1 with a hot-dipped coating conforming to BS EN 1559-1 and BS EN 1559-2 of thickness not less than 13 μm; or d) Roll bonded aluminium coated steel base conforming to the appropriate section of BS 1449-1 with a minimum coating thickness of 20 μm NA.4.2.4 End caps Where exposed to the external atmospheres or to flue products, the end caps should either be of aluminium conforming to BS EN 1856-1:2003, Table 4, or of stainless steel conforming to BS EN 10088-1 as listed in NA.4.1 b) Where the design is such that the end caps are not exposed to the external atmosphere or flue products, the end caps should be of one of the material listed in NA.4.2.3 Where the design is such that end caps are exposed to the external atmosphere but not to the flue products, the end caps should be one of the materials specified in NA.4.2.3 BS EN 1856-1:2009 NA.5 Chimney Test arrangement and Firestop and spacer The chimney test arrangement is that for a fully enclosed assembly, with firestops, according to BS EN 1859 Where the chimney passes through a floor or ceiling it should be provided with a firestop arrangement of non-combustible material The firestop should conform to one of the following requirements of a) or b): a) i The firestop arrangements should be detailed as in Figure NA.1 a); ii The firestop and or firestop and spacer should be of a solid (un-perforated) sheet to prevent the spread of fire from below or from within the floor space; iii The maximum permissible gap between the firestop and or firestop and spacer and the chimney outer casing on any diameter should be mm (3 mm radially); iv Figure NA.1 b) shows an alternative arrangement employing a joist shield If it is for use when entering the loft space area only the top may be left open, otherwise the top is closed b) Any other configuration should provide a minimum fire rating of 30 minutes which can be demonstrated in accordance with BS 476-20 Firestops or firestop/spacers should be fitted between each building compartment through which the chimney passes (see Figures NA.1, and NA.2) BS EN 1856-1:2009 Figure NA.1 b) ceiling into loft space Figure NA.1 a) Section through floors Key Firestop or firestop and spacer Spacer tabs Combined joist shield/firestop Loft insulation Joist Figure NA.1 Section through BS EN 1856-1:2009 Key Firestop or firestop spacer Enclosure Joists Figure NA.2 BS EN 1856-1:2009 NA.6 Flue terminals NA.6.1 Ridge terminals If the terminal is fitted with a ridge terminal adaptor it should be capable of being connected to the type of flue pipe recommended by the manufacturer If the terminal is not provided with a ridge terminal adaptor it should be provided with bolts capable of entering 10 mm holes spaced at 330 mm ± mm centres and with an opening of 45 mm ± mm x 290 mm ± 10 mm to accept a typical ridge terminal adaptor NOTE A typical 'R' type adaptor is shown in Figure NA.2 A means of sealing the terminal to the adaptor should be described by the terminal manufacturer The material used for this sealing should be capable of withstanding temperatures of – 20 °C to + 200 °C ∅ 10 ± 0.5 holes (at least one slotted to suit the size of fluepipe to the standard) Dimensions in millimetres Figure NA.3 — A typical ridge terminal adaptor ('R'-type adaptor) BS EN 1856-1:2009 NA.6.2 Wind resistance tests NA.6.2.1 Methods When tested as described in NA.6.2.2 at the flue flow rates given in Table NA.4, the terminal resistance of a ridge terminal should not be greater than 15 velocity heads (VH) at all three wind test speeds and at all angles NA.6.2.2 Apparatus The apparatus, which is shown diagrammatically in Figure NA.3, comprises: a) a wind generator capable of delivering at the terminal test position a minimum wind front of m2 at speeds up to 10 m/s; b) a flue flow fan having a range of throughputs variable between 15 m3/h and 120 m3/h and an orifice plate to measure the flow sized accordingly; and c) a length of straight rigid flue pipe below the terminal at least m in length, and of the same nominal diameter as the flue terminal or adaptor Table NA.4 — Flue flow rates and values of the constant C Terminal size Minimum flue flow Maximum flue flow Constant mm m3/h m3/h C 75 15 30 4.45 x 104 100 25 50 1.41 x 105 125 40 80 3.43 x 105 150 60 120 7.11 x 105 175 80 160 1.37 x 106 200 103 206 2.26 x 106 NA.6.2.3 Expression of results The wind resistance of a terminal should be measured and calculated in velocity heads (VH) as follows: a) measure the static pressure within the flue at a point 0.5 m below the terminal for the range of flue flows listed in Table NA.4; b) plot a graph of static pressure (mbar) against the square of the flue flow (m3/h)2 This graph should be a straight line passing through the origin; and c) Calculate the resistance of the flue terminal in velocity heads from the equation: Resistance (in VH) = slope x C Where C is obtained from Table NA.4 NA.6.2.4 Procedure for ridge terminals Fit the terminal, together with the 'R' –type adaptors specified or supplied by the manufacturer, into a test roof with a pitch angle of 42 ½°, and determine the resistance of the following velocities and angles BS EN 1856-1:2009 Make tests at wind velocities of m/s, m/s and 10 m/s blowing horizontally and rotate the test roof in 30° steps so that the angle of approach is 0°, 30°, 60°, 90°, 120°, 150° and 180° NOTE Where a special asymmetrical terminal is made, i.e for mono pitch roofs, it is necessary to construct a suitable test roof to the angles specified by the terminal manufacturers Measure the static pressure in the flue 0.5 m below the terminal Dimensions in millimetres Key Ridge terminal Applied warm front Ridge terminal ('R'-type) adaptor Pilot static tube Flue pipe Test roof Flexible tube Flue flow fan with controlled throughput Flow measuring device Figure NA.4 — Apparatus for testing the performance of ridge terminals under wind conditions all ridge terminal adaptor ('R'-type adaptor) BS EN 1856-1:2009 BSI - British Standards Institution BSI is the independent national body responsible for preparing British Standards It presents the UK view on standards in Europe and at the international level It is incorporated by Royal Charter Revisions British Standards are updated by amendment or revision Users of British Standards should make sure that they possess the latest amendments or editions It is the constant aim of BSI to improve the quality of our 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