BS EN 15882-1:2011 BSI Standards Publication Extended application of results from fire resistance tests for service installations Part 1: Ducts BS EN 15882-1:2011 BRITISH STANDARD National foreword This British Standard is the UK implementation of EN 15882-1:2011 The UK participation in its preparation was entrusted to Technical Committee FSH/22/-/9, Fire resistance tests procedures and smoke extractions and dampers A list of organizations represented on this committee can be obtained on request to its secretary This publication does not purport to include all the necessary provisions of a contract Users are responsible for its correct application © The British Standards Institution 2012 ISBN 978 580 58463 ICS 13.220.50; 91.140.30 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 2012 Amendments issued since publication Date Text affected BS EN 15882-1:2011 EN 15882-1 EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM December 2011 ICS 13.220.50; 91.140.30 English Version Extended application of results from fire resistance tests for service installations - Part 1: Ducts Application étendue des résultats des essais de résistance au feu - Partie 1: Conduits résistants au feu Erweiterter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprüfungen für Installationen - Teil 1: Leitungen This European Standard was approved by CEN on 22 October 2011 CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the official versions CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, 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 © 2011 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members Ref No EN 15882-1:2011: E BS EN 15882-1:2011 EN 15882-1:2011 (E) Contents Page Foreword 3 Introduction 4 Scope 5 Normative references 5 Terms and definitions 5 4.1 4.2 4.3 4.4 Critical parameters and factors 6 General 6 Common thermal and mechanical parameters and factors 6 Common constructional parameters and factors 7 Specific constructional parameters and factors 7 Methodology 8 6.1 6.2 6.2.1 6.2.2 Requirements, performance criteria and influences 13 Requirements and performance criteria 13 Influences 13 Insulation 13 Integrity and leakage 13 7.1 7.2 Assessment scheme 14 General 14 Requirement for additional tests 14 8.1 8.2 8.3 8.4 Test arrangements and criteria for additional tests 14 Maximum dimensions of ducts which can be classified 14 Closed ducts with pressure differential 14 Open horizontal duct B 15 Open vertical duct B 15 9.1 9.2 9.2.1 9.2.2 9.2.3 9.2.4 9.3 9.4 9.5 9.6 Evaluation of fire resistance 15 Application of the basic and additional test results 15 Suspension devices 16 General 16 Dimensioning of suspension devices 16 Fixing of suspension devices 16 Longitudinal limit of suspension devices 17 Inspection openings/access panels 17 Components within ducts 17 Surface finishes 17 Change in wall or floor thickness 17 10 Extended application report 18 Bibliography 23 BS EN 15882-1:2011 EN 15882-1:2011 (E) Foreword This document (EN 15882-1:2011) has been prepared by Technical Committee CEN/TC 127 “Fire safety in buildings”, the secretariat of which is held by BSI 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 June 2012, and conflicting national standards shall be withdrawn at the latest by June 2012 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 has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association This European Standard has the general title Extended application of results from fire resistance tests for service installations and consists of the following parts: - Part 1: Ducts; - Part 2: Dampers; - Part 3: Penetration seals; - Part 4: Linear joint seals The Enquiry phase of this project (00127162) took place under the reference prEN 15080-10 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, Croatia, 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 15882-1:2011 EN 15882-1:2011 (E) Introduction There are a number of practical limitations on the size and design of elements that can be tested by the standard methods of fire resistance test When these elements are larger, or are of a modified design, there is a necessity to be able to confirm their performance, i.e whether the classification(s) is (are) given in the classification report in relation to the relevant criteria identified in the Interpretative Document are maintained, without the ability of being able to test them To achieve this, extended application documents for the various elements are under development It is not allowed to change any detail of the duct construction If this is done outside the DiAP1) and EXAP2), the duct has another design and cannot be classified in accordance with EN 13501-3 without further appropriate testing Before there can be any consideration for extended application the duct shall be tested in accordance with EN 1366-1 to achieve a test result which could generate a classification in accordance with EN 13501-3 at least equal to the classification subsequently required from extended application considerations The extended application report should be based on the evaluation of one or more fire resistance test reports on the same proprietary construction of duct A review of the duct construction parameters may indicate that one or more criteria (integrity, insulation, leakage) may be improved by a particular parameter variation In the case of ducts, this should never lead to an increased classification period for any specific parameter beyond that achieved during any one test 1) DiAP = Direct field of application 2) EXAP = Extended field of application BS EN 15882-1:2011 EN 15882-1:2011 (E) Scope This European Standard identifies parameters that affect the fire resistance of ducts for ventilation purposes It also identifies the factors that need to be considered when deciding whether, or by how much a parameter can be extended either positively or negatively when contemplating the fire resistance on an untested variation in the construction This European Standard, where applicable, gives guidance on additional tests that are needed to extend the field of application The European Standard gives the principles behind how a conclusion on the influence of specific parameters/constructional details relating to the relevant criteria (E, I, S) can be achieved This European Standard only applies to ducts tested to EN 1366-1 Duct sections for use other than in fire resisting heating, ventilation and air conditioning (HVAC) systems are not covered by this European Standard It does not cover ducts used for smoke control which are tested in accordance with EN 1366-8 or EN 1366-9 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 1363-1, Fire resistance tests — Part 1: General requirements EN 1366-1:1999, Fire resistance tests for service installations — Part 1: Ducts EN 13501-3, Fire classification of construction products and building elements — Part 3: Classification using data from fire resistance tests on products and elements used in building service installations: Fire resisting ducts and fire dampers EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specific property classes — Coarse thread and fine pitch thread (ISO 898-1:2009) Terms and definitions For the purposes of this document, the terms and definitions given in EN 1363-1 and EN 1366-1 and the following apply 3.1 self-supporting duct duct constructed from fire protective boards to provide fire resistance without using a conventional steel duct 3.2 fire protected steel duct steel duct with or without external insulation or coating to provide integrity or integrity and insulation in case of fire 3.3 duct system complete system, consisting of the duct sections, duct joints, suspensions and penetration seals BS EN 15882-1:2011 EN 15882-1:2011 (E) 3.4 duct section element of a fire resisting duct constructed to form part of a duct system which has to be fire resistant 3.5 structural supports means of retaining the fire resisting duct section to the building structure Critical parameters and factors 4.1 General The following parameters and factors are considered to affect the fire resistance performance of a duct system and shall be taken into account when determining the field of extended application The parameters vary depending upon the nature of the element to be considered The parameters for the common, identifiable forms of duct construction are given in 4.2, 4.3 and 4.4 4.2 Common thermal and mechanical parameters and factors Table — Factors relating to thermal and mechanical parameters Line Parameter and rule reference Factor a Fire exposure Outside or inside b Changes in pressure (positive or negative) Lower or higher c Change in wall/floor type or thickness Rigid or flexible constructions Greater or lower thickness d Forces at wall/floor penetrations Value of force higher or lower BS EN 15882-1:2011 EN 15882-1:2011 (E) 4.3 Common constructional parameters and factors Table — Factors relating to Common constructional parameters Line a b c d e f 4.4 Parameter and rule reference Orientation Change in shape Change in height of cross-section Change in width of cross-section Change in diameter of cross-section Protection material Factor Vertical, horizontal or sloping Rectangular to circular or oval Greater or less than tested Greater or less than tested Greater or less than tested Change of material Specific constructional parameters and factors Table — Factors relating to Specific constructional parameters Line a b c d e f g h Parameter and rule reference Thickness of protection Distance between joints/stiffeners Number of protective layers Change in penetration sealing system around duct Expansion provision Presence of combustible materials within duct Length of vertical ducts between supports Distance and arrangements between the joints of various layers i j k l m n Self-weight of duct Length of horizontal duct between supports/hangers Effect of supports on vertical ducts Length of duct between flanges/spigots Change of structure of steel ducts (e.g type of steel, gauge, … etc.) Effect of access panels o Hanger protection and arrangement p Hangers q Bearers r Anchors s t u v Compensators Components integrated within the duct (fan cases, silencers etc.) Shape of joints in protection boards or insulation Fixing and jointing details Factor Greater or less than tested Greater or less than tested Greater or less than tested Dependant on test data available Greater or less than tested Yes or no Greater or less than tested Greater or less than tested, different arrangement Effect on hangers/supports Greater or less than tested Bending moment, section modulus Greater or less than tested Yes or no Yes or no Size of access panels Access panels protected? Greater or less than tested, different arrangement Length Tensile stress Position relative to any duct joint Bending stress Shear stress Section modulus Type of anchor, chemical or mechanical strength Penetration depth Yes or no Yes or no Mitred, butted or rebate edge Yes or no BS EN 15882-1:2011 EN 15882-1:2011 (E) Methodology When preparing an extended application for a construction product, the parameters listed in Clause relating to ducts shall be considered in turn and their relevance shall be identified This can normally be achieved in a tabular manner with using “yes” to identify those parameters that are relevant, and “no” to identify those that are not For each relevant parameter the appropriate factors from those given in Clause shall be analysed to establish their influence (positive or negative) on the fire resistance of the duct In this case, the influence shall be established for integrity and insulation in turn and where appropriate smoke leakage The analysis shall take the form of considering influence of the proposed variation against: a) The application of the requirements in this European Standard; b) The use of calculations and rules defined in EN 1366-1 or in EN 15882-1 For each factor this analysis shall be transparent and the report shall include the justification BS EN 15882-1:2011 EN 15882-1:2011 (E) Table — Factor influence on criteria (concluded) Factor Influence On Criteria Parameter Mechanical fixings Inclined / sloping ducts Corner details a) b) Factors Smoke Leakage (S) Integrity (E) Insulation (I) Use of screws (same or greater length) instead of staples See rule See rule See rule Use of staples instead of screws See rule See rule See rule Additional test a > 10° from horizontal axis See rule See rule See rule α Allowed provided that both vertical and horizontal tests acc EN 1366-1 have been successfully performed on the same protection system and that the length of the inclined part of the duct is less than the distance between the suspension devices in the horizontal test Penetration through walls and floors are not covered Covered by horizontal test a < 10° See rule See rule See rule Change from «upper/lower board on top vertical boards» to «upper/lower board between vertical boards» OK (=/+ E) OK (=/+ I) OK (=/+ S) Change from «upper/lower board between vertical boards» to «upper/lower board on top vertical boards» Rules Assume that classification will be maintained The windmill test arrangement in figure c) is representative for the other two board combinations (see figures a) and b) on the left), but the test of a single combination does not cover the other combination (e.g a) does not cover the combination b) c) Worse (-E) Worse (-I) Worse (-S) NOTE If more than one variation of the construction parameters are included in the test according to this standard and if the results (time to satisfy the criteria) are lower than those of the basic test according to EN 1366-1, these lower test results shall be taken as basis for the classification of the duct with any one of the variations 12 BS EN 15882-1:2011 EN 15882-1:2011 (E) Requirements, performance criteria and influences 6.1 Requirements and performance criteria Ducts shall be able to withstand all the pressure differentials at all working conditions within the designed system For the assessment of fire resistance with extended applications of ducts the following criteria: a) insulation (see EN 1366-1); b) integrity (see EN 1366-1); c) leakage (see EN 1366-1) shall be taken into account as they are described in EN 1366-1 and in this European Standard 6.2 Influences 6.2.1 Insulation The insulating effect of building materials for ducts with a requirement to the fire resistance is not in linear proportion to their thickness The rules of linear stationary heat transmission are not applicable 6.2.2 a) Integrity and leakage Integrity of duct system The integrity of duct construction, especially the leakage, may be adversely affected due to splitting and cracking and is lost with an increasing number, width and length of gaps and cracks The formation of gaps and cracks in horizontal ducts could be introduced by: 1) displacement of ducts due to long and unprotected hangers, in addition the stability of horizontal ducts is significantly dependent on the design and length of the suspension device; 2) substantial distortion of the bearer/suspension components in the event of a fire (the assessment of the duct does not consider this); 3) increase of cross-sectional area of ducts; 4) high pressure differentials within the ducts; 5) increase of number of joints For exposure to fire from the outside, ducts with external supporting construction or external stiffeners shall be considered as critical With regard to this criterion, insulated steel ducts can be considered less critical than those where supports and stiffeners are outside the insulation b) Integrity at the penetration point of supporting constructions The integrity at the penetration point of supporting constructions, i.e where ducts pass through walls and floors, may be adversely affected due to the deflection of the duct walls, formation of gaps and cracks between the duct surfaces and the adjacent supporting constructions and is lost with increasing width of gaps and cracks 13 BS EN 15882-1:2011 EN 15882-1:2011 (E) The formation of gaps and cracks could be introduced by: 1) high pressure differences within the ducts to the ambient; and 2) large dimensions of ducts NOTE The integrity at the penetration point may be affected also by damages of the fire stopping due to the thermal elongation of the duct NOTE Considerable forces may affect walls due to thermal elongation Adjustable arrangements in wall penetrations and the use of compensators may serve to limit the impact of forces into walls High pressure differentials (e.g over pressures and under pressures) within the ducts may affect the forces, which are apparent within the wall penetrations 7.1 Assessment scheme General Basic information on satisfactory performance of the fire resistance of a duct shall be based on a test in accordance with EN 1366-1 Without further proof, these ducts are suitable for pressure differentials between -300 Pa and +300 Pa 7.2 Requirement for additional tests Additional tests are required (see Table 4), if the classification covers: a) higher pressure differentials than ± 300 Pa or tested; or b) larger cross-sections than a width × height (B × H) = 1250 mm × 1000 mm; or c) heights greater than m between floors; or d) hangers with a length (L) > 1,5 m; or e) access panels, unless already tested Test arrangements and criteria for additional tests 8.1 Maximum dimensions of ducts which can be classified Should an additional test be undertaken, the cross-section of the proposed ducts shall not exceed a width × height (B × H) = 2500 mm × 1250 mm or diameter (D) = 1250 mm The fire resistance of ducts with larger cross-sections is not covered by this European Standard For vertical ducts the distance between two supports (capable of carrying the load of 15 m duct length in case of fire) shall not be more than 15 m 8.2 Closed ducts with pressure differential For over pressure and under pressure in each case a horizontal and a vertical ventilation duct shall be tested The pressure differential during the test shall be adjusted according to EN 1366-1 14 BS EN 15882-1:2011 EN 15882-1:2011 (E) For overpressure and under pressure tests, a condensing unit according to EN 1366-1 shall be installed between duct and volume flow measuring station and shall allow for drainage Control the pressure inside duct A (see Figure and Figure 2) according to the intended values at the beginning of the test and maintain it at this value throughout the test The vertical duct A shall be loaded if the application is intended in practice with height more m (see 8.4 – identical with vertical duct B) 8.3 Open horizontal duct B For the assessment of integrity of horizontal ducts, an additional open ventilation duct as in Figure and Figure 4, shall be mounted into the furnace chamber and tested with simultaneous exposure of the duct from inside and outside Prior to the start of the test stabilise the volume flow rate within this duct B (see Figure and Figure 4) to 0,75 m /s Adjust the fan during the "fan on" parts of the test to maintain the volume flow rate of (0,75 ± 0,1) m /s as in Figure of EN 1366-1:1999 8.4 Open vertical duct B The vertical duct has to be tested according to EN 1366-1, with the exception that the air volume flow rate within duct B is (0,75 ± 0,1) m /s The vertical duct B shall be loaded if the application is intended in practise with height of more than m (see table below) Top end unloaded Top end loaded Top end loaded Tested height within furnace 2m 3m 5m Application 5m 10 m 15 m Vertical ducts used for a height between floors greater than m shall be mounted (tested) within a furnace with a minimum height of m; for a height between floors greater than 10 m the vertical ducts shall be mounted (tested) within a furnace with a minimum height of m At the upper end of the ventilation duct the individual weight of the ducts, which are calculated from the planned height between the two supports of max 15,0 m (see 8.1) minus the clear furnace height, shall be simulated by applying dead loads 9.1 Evaluation of fire resistance Application of the basic and additional test results The evaluation is carried out in accordance with the provisions of EN 1366-1, and to the principles stated in 7.2 15 BS EN 15882-1:2011 EN 15882-1:2011 (E) The classification of the ducts, according to EN 13501-3, may be extended to cover: a) The tested duct pressure, up to the cross-section size for that duct; b) The tested cross-section size, up to the duct pressure for that duct All pressure differentials between the highest tested under pressure and the highest tested overpressure are considered as the tested pressure differential range 9.2 Suspension devices 9.2.1 General The test arrangements of the test in accordance with EN 1366-1 and the additional tests not allow a final evaluation regarding the load-bearing capacity of the suspension devices (structural supports) The suspension devices shall therefore be made according to the following details 9.2.2 Dimensioning of suspension devices The suspension rods shall be made of steel without elastic connecting links and dimensioned so that the calculated stresses not exceed the values given in Table The dimensioning shall be carried out on the basis of the calculated proportionate load from the dead load of the ducts Steel sections in the tested form and size shall be used as traverse support See field of direct application in EN 1366-1 NOTE The dimensioning of suspension rods is necessary to prevent an excessive elongation or breaking of the suspension rods L-shape profile tested covers symmetrical profile (C-shape) but not vice-versa The thickness t shall be greater/equal than tested and the moment of resistance in x- and y-direction shall be greater/equal than tested NOTE Only the specified traverse supports ensure that the casing of fireproofing boards will remain intact at the points of support in the event of a fire Table — Stress limits in suspension devices depending on their fire resistance class Rating for the fire resistance class Load 30 or 60 90 or 120 180 or 240 15 10 Tensile stress σ (N/mm ) in all vertically orientated components Shearing stress τ (N/mm ) in screws of property class 4.6 according to EN ISO 898-1 For higher times of fire resistance no guidance can be given 9.2.3 Fixing of suspension devices The horizontal/vertical ducts shall only be supported by means of suspension devices to beams and floors or roofs having at least the same fire resistance as the ducts Take care that the fixing of the supporting does not adversely affect the fire resistance performance of the load bearing construction For fastening to steel construction elements that are fire protected, mechanically fixed clamps, which comply with the above stated calculated stress limits, shall be used instead of anchors In this case, 16 BS EN 15882-1:2011 EN 15882-1:2011 (E) the fire protection of the steel construction elements shall be elongated to a minimum length of 300 mm to the supporting devices The extension of the fire protection prevents the fire resistance of the steel construction elements from being affected by the attachment to hangers Anchors If these have been tested under maximum allowable load to the heating curve of EN 1363-1, then these can be used without the need to test in a duct system in accordance with EN 1366-1 (see ETAG 001) 9.2.4 Longitudinal limit of suspension devices The suspension height (distance between the underside of a duct and the soffit) shall not exceed 1,50 m for unprotected hangers For these suspension devices an elongation of 40 mm can be expected under fire exposure This elongation is not considered as critical for the specified hanger arrangements If larger suspension distances shall be used, precautions shall be taken to prevent more extensive hanger elongations A fire test with hangers under load shall prove that the above elongation of 40 mm is not exceeded NOTE Clarification for unprotected suspension devices of approximately 1,5 m length an elongation of 40 mm can be expected depending on the fire resistance period 9.3 Inspection openings/access panels If a door for an inspection opening is to be tested in a horizontal duct it shall be included in the basic test arrangement according to EN 1366-1 and shall be mounted in the first straight duct piece after the T-piece after the wall penetration 9.4 Components within ducts Components within ducts (e.g sound attenuators or fans) may be used if it has been proven that they will not affect the fire resistance of the ducts (e.g by weakening of the wall thickness, thermal expansion in the event of a fire, impairment of the stability (also see 2)) Sound attenuators shall be tested with the duct The same locations for use as an access panel shall be used as described above 9.5 Surface finishes The fire resistance classification achieved by the duct shall be regarded as not being changed if a combustible surface finishing in the test specimen is omitted or reduced (amount per m ) 9.6 Change in wall or floor thickness The result of a fire resistance test obtained for a duct passing through a standard supporting construction (see EN 1366-1:1999, Table to Table 5) is applicable to a supporting construction with a fire resistance equal to or greater than that of the standard supporting construction used for the fire test (thicker, denser, more layers of board, as appropriate) Test results obtained with flexible supporting walls may be applied to rigid supporting constructions of a thickness equal to or greater than that of the element used in the tests 17 BS EN 15882-1:2011 EN 15882-1:2011 (E) 10 Extended application report The extended application report, prepared when using this European Standard shall contain the following information: a) name and address of the issuing body; b) name and the address of the sponsor; c) date of issue of the extended application report; d) unique reference number of the report; e) type of element tested specimen(s), including a general description, any trade names of all the products involved or a generic description; f) summary of test report(s) and previously granted extended applications (This is a specially prepared synopsis of the relevant test evidence and not necessarily a summary as given in the report It may be acceptable to append full copies of the relevant documents); g) description of the change(s) to be made, which shall incorporate a clear statement of the proposed variations considered in this document, including any previously requested changes; h) for each factor, the influence of the change to be made regarding the element's fire resistance will be: i) 1) favourable with justification 2) unfavourable with justification 3) no influence with justification classification to the modified duct system in accordance with EN 13501-3; The following statement: “This extended application is issued on the basis of test data and information available at the time of issue If contradictory evidence becomes available to the assessing authority, the extended application will be unconditionally withdrawn and the applicant will be notified in writing Similarly, the extended application is invalidated if the assessed construction is subsequently tested since actual test data is deemed to take precedence over an expressed opinion The extended application is valid for a period defined in the classification report.” 18 BS EN 15882-1:2011 EN 15882-1:2011 (E) Dimensions in millimetres Plan view ● with minimum one duct joint Key Joint covers or stiffeners Duct joint Furnace thermocouples (plate thermometer) For thermocouple Ts – T1 – T2, see Figure 8, Figure and Figure 10 in EN 1366-1:1999 Restrained (for details see 7.4.1 and EN 1366-1:1999) Duct A (see EN 1366-1) Leakage measuring station (detail shown in Figure of EN 1366-1:1999) Figure – Duct A – Arrangement of a closed horizontal duct with a width Bmax of up to 500 mm and a height Hmax of up to 250 mm 19 BS EN 15882-1:2011 EN 15882-1:2011 (E) 000 Dimensions in millimetres Front view Section A-A of Figure Key x Thermocouple (plate thermometer) Figure – Duct A – Arrangement of a open horizontal duct with a width of up to 500 mm and a height Hmax of up to 250 mm (section A-A to Figure 1) 20 BS EN 15882-1:2011 EN 15882-1:2011 (E) Dimensions in millimetres Plan view ● with minimum one duct joint Key Joint covers or stiffeners Duct joint Furnace thermocouples (plate thermometer) For thermocouple Ts – T1 – T2, see Figure 8, Figure and Figure 10 in EN 1366-1:1999 Duct B (see EN 1366-1, volume flow rate 0,75 m /s and see 8.3) Openings: total cross section 50 % of duct cross section (see EN 1366-1) a Gas velocity measuring station (detail shown in Figure of EN 1366-1:1999) Figure – Duct B - Arrangement of an open horizontal duct with a width Bmax of up to 500 mm and a height Hmax of up to 250 mm L: approximately two fittings (see 8.3) 21 BS EN 15882-1:2011 EN 15882-1:2011 (E) 000 Dimensions in millimetres Front view Section A-A of Figure Key x Thermocouple (plate thermometer) Figure – Duct B - Arrangement of an open horizontal duct with a width of up to 500 mm and a height Hmax of up to 250 mm (section A-A to Figure 3) 22 BS EN 15882-1:2011 EN 15882-1:2011 (E) Bibliography ISO 5221, Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air handling duct EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from reaction to fire tests EN 1506, Ventilation for buildings — Sheet metal air ducts and fittings with circular cross-section — Dimensions EN 1507, Ventilation for buildings — Sheet metal air ducts with rectangular section — Requirements for strength and leakage EN ISO 13943, Fire safety — Vocabulary (ISO 13943:2008) EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular crosssection conduits running full — Part 1: General principles and requirements (ISO 5167-1:2003) 23 This page deliberately left blank This page deliberately left blank NO COPYING WITHOUT BSI PERMISSION EXCEPT AS PERMITTED BY COPYRIGHT LAW British Standards Institution (BSI) BSI is the national body responsible for preparing British Standards and other standards-related publications, information and services BSI is incorporated by Royal Charter British Standards and other standardization products are published by BSI Standards Limited About us Revisions We bring together business, industry, government, consumers, innovators and others to shape their combined experience and expertise into 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