BRITISH STANDARD Chimneys — Metal chimneys — Test methods ICS 91.060.40 NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW BS EN 1859:2009 +A1:2013 BS EN 1859:2009 BS EN 1859:2009+A1:2013 National foreword This British Standard is the UK implementation of EN 1859:2009+A1:2013 It supersedes BS EN 1859:2009 which is withdrawn The start and finish of text introduced or altered by amendment is indicated in the text by tags Tags indicating changes to CEN text carry the number of the CEN amendment For example, text altered by CEN amendment A1 is indicated by The UK participation in its preparation was entrusted by Technical Committee B/506, Chimneys to 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 The 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 31 January 2009 © The British Standards Institution 2013 Published by BSI Standards Limited 2013 ISBN 978 580 78887 Amendments/corrigenda issued since publication Date Comments 30 April 2013 Implementation of CEN amendment A1:2013 EUROPEAN STANDARD EN 1859:2009+A1 NORME EUROPÉENNE EUROPÄISCHE NORM April 2013 ICS 91.060.40 Supersedes EN 1859:2009 English Version Chimneys - Metal chimneys - Test methods Conduits de fumée - Conduits de fumée métalliques Méthodes d'essai Abgasanlagen - Metall-Abgasanlagen - Prüfverfahren This European Standard was approved by CEN on May 2009 and includes Amendment approved by CEN on 24 February 2013 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom EUROPEAN COMMITTEE FOR STANDARDIZATION COMIT É E UROPÉ E N DE NORMALISAT ION E UROPÄISCHE S KOMIT E E FÜR NORMUNG Management Centre: Avenue Marnix 17, B-1000 Brussels © 2013 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 1859:2009+A1:2013: E BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Contents Page Foreword Scope Normative references Definitions 4.1 4.1.1 4.1.2 4.2 4.2.1 4.2.2 4.3 4.3.1 4.3.2 4.4 4.4.1 4.4.2 4.5 4.5.1 4.5.2 4.5.3 4.5.4 4.6 4.6.1 4.6.2 4.6.3 4.7 4.7.1 4.7.2 4.7.3 4.7.4 4.8 4.8.1 4.8.2 4.8.3 4.8.4 4.8.5 4.9 4.9.1 4.9.2 4.10 4.10.1 4.10.2 4.10.3 4.10.4 4.11 4.11.1 4.11.2 4.11.3 4.11.4 4.12 Test methods for metal chimney products .5 Compressive strength Sections and Fittings Chimney support Tensile strength Test assembly Test procedure and results Lateral strength Fittings in non-vertical orientation Wind load Gas tightness .7 Test assembly Procedure and results Thermal performance test Apparatus .7 Test environment and conditioning 10 Test procedure 10 Results 11 Thermal resistance 13 Test assembly 13 Test procedure 13 Results 13 Water vapour diffusion resistance 14 Conditioning 14 Test assembly 14 Test procedure 14 Results 14 Condensate resistance test 14 Test apparatus 14 Test sample 14 Measuring parameters 14 Test procedure 14 Test results 15 Rainwater resistance 15 Chimney sections 15 Rainwater terminal 15 Terminal flow resistance 16 Conditioning 16 Test assembly 16 Procedure 16 Results 17 Aerodynamic behaviour of terminal under wind conditions 17 Conditioning 17 Test assembly 17 Procedure 17 Results 17 Flow resistance of fittings 17 BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) 4.12.1 4.12.2 4.12.3 4.12.4 Determination of flow conditions 17 Test assembly 18 Execution of the measurements 18 Calculation of the friction value 19 Test report 19 Annex A (normative) Method for measuring ambient temperature 34 Annex B (normative) Method for hot gas temperature measurements 35 Annex C (informative) Method for metal surface temperature measurements 36 Annex D (normative) Method for combustible wood surface temperature measurements 37 Annex E (normative) Locations of thermocouples for surface temperature measurements 38 E.1 Test structure, surface temperatures 38 E.2 Test chimney, surface temperatures 38 E.2.1 General 38 E.2.2 Test chimney, freestanding 38 E.2.3 Test chimney, corner installation 38 E.2.4 Test chimney, corner installation, enclosed 39 Annex F (normative) Simplified calculation of thermal resistance for circular flues 43 Annex G (informative) Method for applying an evenly distributed load (horizontal) 45 Annex H (informative) Possible test sequence 46 Annex I (informative) Techniques for flue gas volume flow measurements 47 Bibliography 48 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Foreword This document (EN 1859:2009+A1:2013) 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 2013, and conflicting national standards shall be withdrawn at the latest by October 2013 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 includes Amendment approved by CEN on 24 February 2013 This document !supersedes EN 1859:2009" The start and finish of text introduced or altered by amendment is indicated in the text by tags !" 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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United Kingdom BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Scope This European Standard describes test methods for metal chimney products Normative references !The following documents, in whole or in part, are normatively referenced in this document and are indispensable for its application For dated references, only the edition cited applies For undated references, the latest edition of the referenced document (including any amendments) applies." EN 1443:2003, Chimneys General requirements EN 1856-1:2009, Chimneys Requirements for metal chimneys Part 1: System chimney products EN 60068-2-59, Environmental testing Part 2: Test methods Test Fe: Vibration, Sine beat method (IEC 60068-2-59:1990) EN 60529, Degrees of protection provided by enclosures (IP Code) (IEC 60529:1989) ISO 3966, Measurement of fluid flow in closed conduits Velocity area method using Pitot static tubes Definitions For the purposes of this standard, the definitions given in EN 1443:2003 and EN 1856-1:2009 apply Test methods for metal chimney products 4.1 Compressive strength 4.1.1 4.1.1.1 Sections and Fittings Test assembly Assemble the fitting according to the manufacturer's installation instructions between two adaptors including one chimney section (see Figure 1a) The adaptors shall be supplied by the chimney manufacturer and shall transfer the test load in the usual way to the load bearing wall of the test components as it is done in the installation The test load shall be transferred to the test components by means of a pivoted plate 4.1.1.2 Procedure and results Increase the test load on the components without shock up to times the design load where the flue liner is load bearing or times the design load where the flue liner is non load bearing The load shall be measured to an accuracy of % of the design load Record the result Where the design load is unknown, increase the test load uniformly and record the results to allow the point of failure to be detected Failure is deemed to have occurred when the fitting cannot sustain a further increase in load Use the minimum value from three failure loads to determine the design load BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) 4.1.2 Chimney support 4.1.2.1 Test assembly Install the chimney support according to the manufacturer's installation instructions Apply the test load to the chimney support through a chimney section and an adaptor (see Figure 1b) The adaptor shall be supplied by the chimney manufacturer and shall transfer the test load in the usual way to the load bearing wall of the chimney sections The test load shall be transferred to the test component by means of a pivoted plate 4.1.2.2 Procedure and results Increase the test load up to the design load without shock Record the maximum displacement of the chimney Measure the displacement to an accuracy of 0,1 mm Further increase the load up to times the design load Record the results Measure the load to an accuracy of % of the design load Where the design load is unknown, increase the load uniformly and record the results to allow the point of failure to be detected Failure is deemed to have occurred when the support cannot sustain a further increase in load Record the displacement during the load increase Use the minimum value from three failure loads to determine the design load 4.2 Tensile strength 4.2.1 Test assembly Install the chimney sections according to the manufacturer's installation instructions Apply the test load through an adaptor (see Figure 1c) The adaptor shall be supplied by the chimney manufacturer and shall transfer the test load in the usual way to the load bearing wall of the chimney sections 4.2.2 Test procedure and results Increase the test load on the components without shock up to 1,5 times the design load The load shall be measured to an accuracy of % of the design load Record the result Where the design load is unknown, increase the test load uniformly and record the results to allow the point of failure to be detected Failure is deemed to have occurred when the fitting cannot sustain a further increase in load Use the minimum value from three failure loads to determine the design load 4.3 Lateral strength 4.3.1 4.3.1.1 Fittings in non-vertical orientation Test assembly Install the chimney fittings and supports at the maximum angle from vertical according to the manufacturer's installation instructions using additional vertical supports to install the sections without deflection (see Figure 2) 4.3.1.2 Procedure and results Remove the additional vertical supports Record the maximum deflection to an accuracy of 0,1 mm BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) 4.3.2 Wind load 4.3.2.1 Test assembly Install the chimney components according to the manufacturer's installation instructions Use the test assembly consisting of the manufacturer's declared freestanding components and further chimney sections up to the manufacturer's maximum declared lateral support separation distance between the supports, and once again the same distance up to an anchor point (see Figure 3) 4.3.2.2 Procedure and results Apply an evenly distributed test load increased uniformly up to 1,5 kN/m ± 2,5 % NOTE A method for applying an evenly distributed load is described in informative Annex G Other methods using a vertical assembly may also be used Apply the test load to those components declared by the manufacturer for external use, except 50 % of the last laterally supported section of the test assembly Apply the test load by a number of individual evenly distributed loads equally spaced from the freestanding end at not more than (0,2 ± 0,01) m intervals The individual loads shall not vary by more than % Record the results 4.4 Gas tightness 4.4.1 Test assembly Construct the test assembly as described in 4.5 Seal the test assembly chimney flue outlet with an air tight seal Use adaptors supplied by the manufacturer in order to ensure that the chimney inlet and outlet are closed in a typical manner Connect a positive pressure air supply and flow meter to the test chimney flue inlet with appropriate air tight seals Connect a manometer to the flue of the test assembly (see Figure 4) 4.4.2 Procedure and results The test shall be carried out at ambient temperature Deliver air from the air supply to the flue at a rate necessary to achieve and maintain the required test pressure given in Table of EN 1856-1:2009 Measure the test pressure and the air flow rate, both to an accuracy of ± 5,0 % Record the air flow rate 4.5 Thermal performance test 4.5.1 Apparatus The test assembly shall comprise a test structure (see 4.5.1.2), a test chimney (see 4.5.1.3), a hot gas connecting pipe (see 4.5.1.4), and measuring equipment (see 4.5.1.5) 4.5.1.1 Test assembly Construct an open room outlet test assembly consisting of the test chimney in the test structure The chimney shall be tested according to Figure NOTE Figure shows the arrangement for testing off-sets BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) 4.5.1.2 4.5.1.2.1 Test structure General Construct a test structure consisting of two walls at right angles and two floors through which the test chimney passes, of construction as described in 4.5.1.2.2 and 4.5.1.2.3 or of equivalent thermal characteristics and dimensions The floor opening and wall position shall enable the test chimney to be erected so that all parts of the test structure are at the manufacturer's specified clearance X mm from the chimney The area below the first floor referenced as Zone A, the area between the first floor and second floor as Zone B, and the area above the second floor as Zone C, as shown in Figure The wall/floor interface shall be fitted with nominally 20 mm x 100 mm skirting board The vertical distance between the floor and ceiling in Zone B shall be (2 400 ± 25) mm The height of the chimney protruding into Zone C shall not be less than 900 mm Timbers shall have a dimensional tolerance of ± mm 4.5.1.2.2 Walls Construct walls consisting of nominal dimension 38 mm x 89 mm thick timbers in a framework (see Figure 5) faced on each side with one layer of nominally 12 mm thick plywood to give a total thickness of 113 mm ± mm, insulated in the voids with mineral fibre insulant having a thermal conductivity of 0,035 W/m K ± 0,002 W/m K at 20 °C with a minimum density of 70 kg/m The walls shall extend at least 200 mm 4.5.1.2.3 Floors Construct flooring framework of nominal dimension 50 mm x 200 mm timbers at the first floor level and nominal dimension 50 mm x 100 mm timbers at the second floor level forming an opening that enables the test chimney to be erected so that all parts of the test structure comply with the manufacturer's declared minimum distance to combustible material from the chimney fittings (see Figure 5) and covered with one thickness of nominal dimension 20 mm boarding for the floors and one thickness of nominal dimension 12 mm plywood for the ceilings, except for the second floor ceiling (exposed top), and the spaces between the timbers filled with 100 mm thick mineral wool slab with a thermal conductivity of 0,035 W/m K ± 0,002 W/m K at 20 °C, with a minimum density of 70 kg/m 4.5.1.3 Test chimney Construct the test chimney using the components materials and construction representing the manufacturer's product range, including a termination, and, at least joints Assemble the chimney in accordance with the manufacturer's installation instructions, including firestops or firestops and spacers to a height of not less than 4,5 m, including base support components, if used Construct the test chimney according to Figure for all sections, T pieces and inspection openings Where a manufacturer’s product range includes bends, the test chimney shall include one offset (see Figure 6), with an offset angle of maximum 45° and an offset distance of 0.75 m ± 0.25 m Any inspection opening shall be in Zone C Include any finishing (e.g non-combustible enclosures or claddings) specified in the manufacturer's instructions 4.5.1.4 Hot gas connecting pipe Construct a purpose-made insulated straight flue pipe having an internal diameter equal to that of the flue of the test chimney of a length of approximately seven diameters (7D) measured from the centre line of the flue gas generator to the entry to the test chimney, insulated to provide a thermal resistance value of not less than that equivalent to 50 mm thickness of material having a thermal conductivity of 0,125 W/m K ± 0,005 W/m K at 750°C NOTE This item should be supplied by the chimney manufacturer BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex C (informative) Method for metal surface temperature measurements Attach a thermocouple made from wire not more than 0,5 mm in diameter to the surface by welding as shown in Figure C.1 Key Weld to Test Surface Figure C.1 Method of attachment for thermocouple 36 BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex D (normative) Method for combustible wood surface temperature measurements Use thermocouples made from wire not more than 0,56 mm in diameter The thermocouples shall have 13 mm ± mm of wire exposed and passed through holes in those parts of the structure to receive them The exposed portions of the thermocouples shall be bent over, depressed flush with the surface and held in contact with the surface by staples passing over the wires close to the thermocouple junction 37 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex E (normative) Locations of thermocouples for surface temperature measurements E.1 Test structure, surface temperatures For measuring the surface temperature at the test structure use a device with an accuracy of ± °C The thermocouples shall be located on the test structure as follows, see Figure E.1: a) Wood joists on surfaces adjacent to the chimney: First floor and second floor: one row of five thermocouples at least sufficient to go beyond the centre line located on both walls spaced at a regular distance of 50 mm ± 2,0 mm beginning 100 mm ± 2,0 mm from the corner b) Wall panels between floors: 300 mm below the ceiling of the second floor located on both walls one row of five thermocouples spaced at a regular distance of 50 mm ± 2,0 mm beginning 100 mm ± 2,0 mm from the corner !For insulated penetrations without enclosure in zone B additional thermocouples shall be located as follows, see Figure E.2: 300 mm above the floor of the first floor penetration located on both walls, one row of five thermocouples spaced at a regular distance of 50 mm ± 2,0 mm beginning 100 mm ± 2,0 mm from the corner." E.2 Test chimney, surface temperatures E.2.1 General For measuring the surface temperature at the test chimney where appropriate use a device with an accuracy of ± °C The measuring point for accidental human contact is the outer surface temperature in Zone A, !see Figure E.3", in a height of 0,5 m ± 0,1 m E.2.2 Test chimney, freestanding The thermocouples on external surfaces shall be located at levels of 0,5 m ± 10 mm, 1,5 m ± 10 mm and 2,5 m ± 10 mm above the gas inlet, !see Figure E.3" The temperature of flue gases within the sample may be measured at each level by means of a rake inserted vertically into the centre of the flue E.2.3 Test chimney, corner installation The thermocouples on external surfaces shall be located as follows: 500 mm above the flue gas inlet on the two surfaces situated to the room 38 BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) E.2.4 Test chimney, corner installation, enclosed The thermocouples on external surfaces shall be located as follows: 300 mm below the ceiling of the second floor on the additional walls of the enclosure NOTE The measuring points of the thermal resistance test fulfil this requirement Measure the ambient air temperature with an accuracy of ± 0,5 K, additionally in Zone B at a position (300 ± 5) mm below the ceiling of the second floor with a distance to the test structure according to 4.5.1.5.1 39 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) !Dimensions in millimetres" Key Zone A Zone B x - surface temperature position Figure E.1 Test structure – Location of surface temperature on the test structure 40 BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) ! Dimensions in millimetres Key Zone B X Zone A Surface Figure E.2 — Test structure — Location of surface temperature on the test structure for insulated penetrations without enclosure in zone B " 41 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) ! Key Symbols: temperatures • flue gas temperature Figure E.3 — Test chimneys — Examples of test assembly configurations " 42 BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex F (normative) Simplified calculation of thermal resistance for circular flues The value of thermal resistance shall be computed with: D D 1 = ∑ h ⋅ ln n +1 ⋅ f Λ Dn ⋅ λn (F.1) where 1 Λ is the thermal resistance in square metres Kelvin per watt; Dh is the internal hydraulic diameter of the flue in metres; λn is the thermal conductivity of the wall n in watt per metre Kelvin; Dn is the inner diameter of the wall n in metres; Dn+1 is the outer diameter of the wall n in metres; f is the factor = 0,65 If the thermal conductivity depends on the temperature, it shall be computed iteratively with: t m,n = tn + tn + (F.2) where tm,n is the mean temperature of the wall n in degrees Celsius; tn is the inner surface temperature of the wall n in degrees Celsius; tn+1 is the outer surface temperature of the wall n in degrees Celsius tn +1 = tn q= D q× f Ln n +1 2π λ n Dn π Dh (t N − tu ) Dh + + α i Λ Dha × α a (F.3) (F.4) or q= π Dh (ti − tu ) Dh + Λ Dha × α a (F.5) 43 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) where q= heat flow watts per square metres Kelvin length αi is the internal film coefficient in watts per square metres Kelvin; αa is the external film coefficient in watts per square metres Kelvin; Dha is the external hydraulic diameter of the chimney in metres; tN is the nominal flue gas temperature in degrees Celsius; tu is the ambient temperature in degrees Celsius; ti is the inner surface temperature of the liner in degrees Celsius (F.6) The value of the outer film coefficient for normal condition is: αa = W m2 K (F.7) For the calculation the liner surface temperature shall be 20 % below the nominal working temperature, but not more than 200 °C for dry chimneys or 70 °C for wet chimneys: 0.8 ⋅ t g for t g < 250º C ti = for dry chimneys 200º C for t g ≥ 250º C 0.8 ⋅ t g for t g < 87,5º C ti = for wet chimneys 70º C for t g ≥ 87,5º C If the chimney has only one relevant wall, the thermal resistance is computed as follows: D D = h Ln h × f Λ Zλn Dha (F.8) λn = f (t m , material ) (F.9) tm = ti + ta Dh Dha × α a ta = (ti − tu ) Dh + λ Dha × α a 44 (F.10) (F.11) BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex G (informative) Method for applying an evenly distributed load (horizontal) Install the chimney components according to the manufacturer's installation instructions in a horizontal orientation Position a rope or strap over the chimney at 0,2 m ± 0,01 m intervals from the freestanding end of the test assembly, at each end of which is a free hanging container for water of approximately 10 l capacity Mount a tube of approximately 160 mm diameter above both rows of containers in such a manner that the tubes can be rotated through 180° Fit nozzles with an orifice of approximately 2,0 mm diameter positioned to coincide with the containers Fill and level the tubes Turn both tubes to fill the containers Adjust container contents to an accuracy of 0,5 l to ensure an even distribution Continue to fill the containers evenly until a distributed load of 1,5 kN/m is achieved Record the result Key A is the manufacturer's declared freestanding length B C is the wall bracket is the manufacturer's declared wall bracket separation distance P D is the anchor point is the distance (in metres) over which the load is evenly distributed in steps of 0,2 meters, D = A + C + ½C Figure G.1 Windload test assembly 45 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex H (informative) Possible test sequence The following list represents a sequence for testing metal chimneys It has been compiled on the basis that failure to meet the specific requirements associated with the test could save further, possibly costly, tests being undertaken a) Check manufacturer's literature b) Check the chimney fittings for dimensions (diameter, length (where appropriate), bend angle (where appropriate), etc.) c) Strength tests (compressive on sections, T-fittings ( 4.1.1) and supports (4.1.2), tensile (4.2, where appropriate), lateral (4.3.1, where appropriate), and wind load (4.3.2, on appropriate sections) For chimney products not requiring thermal testing only a final gas tightness test should be carried out following these tests d) Vibration condition sections required for thermal tests (4.5.2.2) e) Assemble the test chimney (4.5.1.3) f) Gas tightness test (4.4) g) Thermal test for nominal working temperature (4.5 and 4.5.3.1, where appropriate) h) Measure flue regularity only i) Gas tightness test (4.4) j) Thermal shock test (4.5 and 4.5.3.2, where appropriate) k) Measure flue regularity only l) Gas tightness (4.4) m) Repeat thermal test at nominal working temperature (4.5 and 4.5.3.1, where appropriate) n) Gas tightness test (4.4) o) If thermal resistance is to be determined by test, undertake thermal resistance tests (4.6) p) Water vapour diffusion resistance (4.7), and condensate resistance test (4.8), where appropriate q) Rainwater resistance (4.9.1 on the appropriate sections) r) Rainwater resistance (4.9.2 on the appropriate sections) s) Terminal flow resistance (4.10) t) Aerodynamic behaviour of terminal (4.11) u) Confirm manufacturer information and check marking, labelling and packaging 46 BS 1859:2009+A1:2013 EN EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Annex I (informative) Techniques for flue gas volume flow measurements Measure the hot gas volume flow by the use of a pitot tube according to ISO 3966, on orifice plate or gas analysis measurement techniques 47 BS EN 1859:2009+A1:2013 EN 1859:2009+A1:2013 (E) EN 1859:2009+A1:2013 (E) Bibliography [1] EN 1856-2, Chimneys Requirements for metal chimneys Part 2: Metal liners and connecting flue pipes [2] EN 13216-1, Chimneys Test methods for system 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