Fire classification of construction products and building elements - Part 4: Classification using data from fire resistance tests on components of smoke control systems

This European Standard specifies the procedure for classification of components of smoke control systems, using data from fire resistance tests which are within the field of application of the relevant test methods. Classification on the basis of extended application of test results is also included in the scope of this European Standard.
Products covered by this European Standard are:
-   smoke control ducts;
-   smoke control dampers;
-   smoke barriers;
-   powered smoke and heat exhaust ventilators (fans), including connectors;
-   natural smoke and heat exhaust ventilators.
Relevant documents which include the relevant test methods which have been prepared for these products are listed in Clause 2.

Klassifizierung von Bauprodukten und Bauarten zu ihrem Brandverhalten - Teil 4: Klassifizierung mit den Ergebnissen aus den Feuerwiderstandsprüfungen von Anlagen zur Rauchfreihaltung

Diese Europäische Norm legt das Verfahren zur Klassifizierung von Bauteilen zur Rauch  und Wärmefreihaltung anhand der Ergebnisse von Feuerwiderstandsprüfungen entsprechend dem direkten Anwendungsbereich der zugehörigen Prüfverfahren fest. Die Klassifizierung auf der Basis des erweiterten Anwendungsbereichs von Versuchsergebnissen wird ebenfalls in dieser Europäischen Norm behandelt.
Folgende Bauprodukte werden von dieser Europäischen Norm abgedeckt:
-   Entrauchungsleitungen;
-   Rauchschutzklappen;
-   Rauchschürzen;
-   maschinelle Rauch  und Wärmeabzugsgeräte (Ventilatoren) einschließlich deren Verbindungsteile;
-   natürliche Rauch  und Wärmeabzugsgeräte.
Die für diese Bauprodukte entwickelten zugehörigen Prüfverfahren sind in den nach Abschnitt 2 aufgeführten Dokumenten enthalten.

Classement au feu des produits et éléments de construction - Partie 4: Classement à partir des données d'essais de résistance au feu des composants de dispositifs de contrôle de fumée

La présente Norme européenne spécifie le mode opératoire de classement des composants de dispositifs de contrôle de fumée, à partir des données des essais de résistance au feu qui font partie du domaine d'application des méthodes d'essai correspondantes. Le domaine d’application de la présente Norme européenne inclut également le classement basé sur l’application étendue des résultats d’essai.
La présente Norme européenne couvre les produits suivants :
—   les conduits de désenfumage ;
—   les volets de désenfumage ;
—   les écrans de cantonnement de fumée ;
—   les ventilateurs pour le contrôle de fumées et de chaleur, y compris les joints de connexion ;
—   les dispositifs d’évacuation naturelle de fumées et de chaleur.
L'Article 2 dresse la liste des documents pertinents concernant les méthodes d'essais applicables qui ont été élaborées pour ces produits.

Požarna klasifikacija gradbenih proizvodov in elementov stavb - 4. del: Klasifikacija na podlagi podatkov iz preskusov požarne odpornosti elementov sistemov za nadzor dima

Ta evropski standard določa postopek klasifikacije sestavnih delov sistemov za nadzor dima na podlagi podatkov iz preskusov požarne odpornosti, ki spadajo v področje uporabe ustreznih preskusnih metod. Področje uporabe tega evropskega standarda zajema tudi klasifikacijo na podlagi razširjene uporabe rezultatov preskusov.
Ta evropski standard obravnava naslednje proizvode:
– kanali za nadzor dima;
– dušilniki za nadzor dima;
– protidimne pregrade;
– električni prezračevalniki (ventilatorji) za odstranjevanje dima in toplote, vključno s priključki;
– naravni prezračevalniki za odstranjevanje dima in toplote.
Pomembni dokumenti z opisom ustreznih preskusnih metod, ki so bile izdelane za te proizvode, so navedeni v 2. točki.

General Information

Status
Published
Public Enquiry End Date
29-Dec-2015
Publication Date
16-Aug-2016
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
21-Jul-2016
Due Date
25-Sep-2016
Completion Date
17-Aug-2016

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Požarna klasifikacija gradbenih proizvodov in elementov stavb - 4. del: Klasifikacija na podlagi podatkov iz preskusov požarne odpornosti elementov sistemov za nadzor dimaKlassifizierung von Bauprodukten und Bauarten zu ihrem Brandverhalten - Teil 4: Klassifizierung mit den Ergebnissen aus den Feuerwiderstandsprüfungen von Anlagen zur RauchfreihaltungClassement au feu des produits et éléments de construction - Partie 4: Classement à partir des données d'essais de résistance au feu des composants de dispositifs de contrôle de fuméeFire classification of construction products and building elements - Part 4: Classification using data from fire resistance tests on components of smoke control systems13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elementsICS:Ta slovenski standard je istoveten z:EN 13501-4:2016SIST EN 13501-4:2016en,fr,de01-september-2016SIST EN 13501-4:2016SLOVENSKI

STANDARDSIST EN 13501-4:2007+A1:20091DGRPHãþD
SIST EN 13501-4:2016
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 13501-4
June
t r s x ICS
s uä t t rä w r Supersedes EN
s u w r sæ vã t r r y ªA sã t r r {English Version
Fire classification of construction products and building elements æ Part

vã Classification using data from fire resistance tests on components of smoke control systemsClassement au feu des produits et éléments de construction æ Partie

vã Classement à partir des données d 5essais de résistance au feu des composants de dispositifs de contrôle de fumée

Klassifizierung von Bauprodukten und Bauarten zu ihrem Brandverhalten æ Teil

vã Klassifizierung mit den Ergebnissen aus den Feuerwiderstandsprüfungen von Anlagen zur Rauchfreihaltung This European Standard was approved by CEN on

t u April
t r s xä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey andUnited Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s x CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s u w r sæ vã t r s x ESIST EN 13501-4:2016
EN 13501-4:2016 (E) 2 Contents

Page European foreword ..........................................................................................................................................4 Introduction .......................................................................................................................................................5 1 Scope .......................................................................................................................................................6 2 Normative references .......................................................................................................................6 3 Terms and definitions ......................................................................................................................7 4 Fire scenarios ......................................................................................................................................8 4.1 General ...................................................................................................................................................8 4.2 The standard temperature/time curve (post flash-over fire) ...........................................9 4.3 The slow heating curve (smouldering fire) ..............................................................................9 4.4 Constant temperature attack .........................................................................................................9 4.5 Specific thermal actions ................................................................................................................ 10 4.5.1 Smoke control ducts ....................................................................................................................... 10 4.5.2 Smoke control dampers ................................................................................................................ 10 4.5.3 Smoke barriers ................................................................................................................................. 10 4.5.4 Powered smoke and heat control ventilators ....................................................................... 10 4.5.5 Natural smoke and heat exhaust ventilators ........................................................................ 10 5 Resistance to fire performance characteristics ................................................................... 11 5.1 General ................................................................................................................................................ 11 5.2 Performance characteristics ....................................................................................................... 11 5.2.1 E – Integrity ....................................................................................................................................... 11 5.2.2 I – Insulation ..................................................................................................................................... 12 5.2.3 S – Smoke leakage ........................................................................................................................... 12 5.2.4 D – Stability duration under constant temperature ........................................................... 12 5.2.5 DH – Stability duration under the standard time-temperature curve ......................... 12 5.2.6 F – Functionality of powered smoke and heat ventilators ............................................... 13 5.2.7 B – Functionality of natural smoke and heat ventilators .................................................. 13 6 Declaration of performance ........................................................................................................ 13 6.1 Classification periods .................................................................................................................... 13 6.2 Designatory letters ......................................................................................................................... 13 6.3 Declaration of performance ........................................................................................................ 13 6.4 Declaration of classes in product standards ......................................................................... 13 6.5 Number of tests required for classification ........................................................................... 13 6.6 Presentation of classification ..................................................................................................... 14 7 Classification procedure for fire resistance .......................................................................... 14 7.1 General ................................................................................................................................................ 14 7.1.1 Procedure ........................................................................................................................................... 14 7.1.2 General rules for deducing the number of fire resistance tests ..................................... 15 7.1.3 Field of application ......................................................................................................................... 15 7.2 Classification of smoke control ducts ...................................................................................... 16 7.2.1 General ................................................................................................................................................ 16 7.2.2 Test methods and field of application rules .......................................................................... 16 7.2.3 Tests to be performed ................................................................................................................... 16 7.2.4 Performance criteria ..................................................................................................................... 17 SIST EN 13501-4:2016

EN 13501-4:2016(E) 3 7.2.5 Classes ................................................................................................................................................. 18 7.3 Classification of smoke control dampers ............................................................................... 19 7.3.1 General ................................................................................................................................................ 19 7.3.2 Test method and field of application rules ............................................................................ 19 7.3.3 Tests to be performed ................................................................................................................... 19 7.3.4 Performance criteria ..................................................................................................................... 20 7.3.5 Classes ................................................................................................................................................. 22 7.4 Classification of smoke barriers ................................................................................................ 23 7.4.1 General ................................................................................................................................................ 23 7.4.2 Test method....................................................................................................................................... 23 7.4.3 Tests to be performed ................................................................................................................... 23 7.4.4 Performance criteria ..................................................................................................................... 24 7.4.5 Classes ................................................................................................................................................. 24 7.5 Classification of powered smoke and heat control ventilators ...................................... 24 7.5.1 Test method....................................................................................................................................... 24 7.5.2 Tests to be performed ................................................................................................................... 24 7.5.3 Performance criteria ..................................................................................................................... 24 7.5.4 Classes ................................................................................................................................................. 25 7.6 Classification of natural smoke and heat exhaust ventilators ........................................ 25 7.6.1 Test method....................................................................................................................................... 25 7.6.2 Tests to be performed ................................................................................................................... 25 7.6.3 Performance criteria ..................................................................................................................... 25 7.6.4 Classes ................................................................................................................................................. 25 Annex A (normative)

Classification report ......................................................................................... 26 A.1 General ................................................................................................................................................ 26 A.2 Content and format ......................................................................................................................... 26

SIST EN 13501-4:2016

EN 13501-4:2016 (E) 4 European foreword This document (EN 13501-4:2016) has been prepared by Technical Committee CEN/TC 127 “Fire safety in buildings”, the secretariat of which is held by BSI. This document supersedes EN 13501-4:2007+A1:2009. 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 2016, and conflicting national standards shall be withdrawn at the latest by March 2018. 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. CEN, CENELEC and EOTA committees preparing technical specifications which contain performance requirements against fire resistance tests can make reference to the fire resistance classification given in this European Standard and not refer directly to any specific fire test method. EN 13501 Fire classification of construction products and building elements consists of the following parts: — Part 1: Classification using data from reaction to fire tests — Part 2: Classification using data from fire resistance tests, excluding ventilation services — Part 3: Classification using data from fire resistance tests on products and elements used in building service installations: fire resisting ducts and fire dampers — Part 4: Classification using data from fire resistance tests on components of smoke control systems — Part 5: Classification using data from external fire exposure to roof tests — Part 6: Classification using data from reaction to fire tests on electric cables 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. SIST EN 13501-4:2016

EN 13501-4:2016(E) 5 Introduction This European Standard defines a harmonized procedure for the classification for resistance to fire of construction products. This classification is based on the test procedures sited in the relevant documents listed in Clause 2 and the relevant field of application procedures. This European Standard is prepared in support of the second basic requirement, in the EC Construction Products Regulation ( 305/2011) and is detailed in the Interpretative Document number 2 (ID2): Safety in case of fire (OJC62 Vol 37). The Interpretative Document and the Commission Decision of 3 May 2000 specify performance and classes regarding fire resistance. These classes are identified by designation letters, each of which refers to an important characteristic of fire resistance behaviour. This European Standard provides for a common understanding for these requirements. It interprets the functional requirements for the different groups of building products/elements and explains the method for deriving their classification on the basis of test results and/or extended application results for individual products/elements. NOTE Test reports constitute the basis for extended application reports as explained in EN 15725. SIST EN 13501-4:2016

EN 13501-4:2016 (E) 6 1 Scope This European Standard specifies the procedure for classification of components of smoke control systems, using data from fire resistance tests which are within the field of application of the relevant test methods. Classification on the basis of extended application of test results is also included in the scope of this European Standard. Products covered by this European Standard are: — smoke control ducts; — smoke control dampers; — smoke barriers; — powered smoke and heat control ventilators (fans), including connectors; — natural smoke and heat exhaust ventilators. Relevant documents which include the relevant test methods which have been prepared for these products are listed in Clause 2. 2 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 1363-1, Fire resistance tests - Part 1: General Requirements EN 1363-2, Fire resistance tests - Part 2: Alternative and additional procedures EN 1366-1, Fire resistance tests for service installations - Part 1: Ventilation ducts EN 1366-2, Fire resistance tests for service installations - Part 2: Fire dampers EN 1366-8, Fire resistance tests for service installations - Part 8: Smoke extraction ducts EN 1366-9, Fire resistance tests for service installations - Part 9: Single compartment smoke extraction ducts EN 1366-10, Fire resistance tests for service installations - Part 10: Smoke control dampers EN 12101-1:2005, Smoke and heat control systems - Part 1: Specification for smoke barriers EN 12101-2, Smoke and heat control systems - Part 2: Specification for natural smoke and heat exhaust ventilators EN 12101-3, Smoke and heat control systems - Part 3: Specification for powered smoke and heat control ventilators (Fans) EN 15725, Extended application reports on the fire performance of construction products and building elements SIST EN 13501-4:2016

EN 13501-4:2016(E) 7 EN ISO 13943:2010, Fire safety - Vocabulary (ISO 13943:2008) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN ISO 13943:2010 and the following apply. 3.1 direct field of application outcome of a process (involving the application of defined rules) whereby a test result is deemed to be equally valid for variations in one or more of the product properties and/or intended end use applications 3.2 extended field of application outcome of a process (involving the application of defined rules that can incorporate calculation procedures) that predicts, for a variation of a product property and/or its intended end use application(s), a test result on the basis of one or more test results to the same test standard 3.3 test specimen product provided for test purposes 3.4 smoke control duct duct used in a system to control the movement and/or containment of smoke and heat 3.4.1 single compartment smoke control duct smoke control duct designed to provide a degree of fire resistance for use within single fire compartment application 3.4.2 multi compartment smoke control duct smoke control duct designed to provide a degree of fire resistance for use in multicompartment applications 3.5

smoke control dampers device, open or closed in its operational position to control the flow of smoke and hot gasses, which is automatically or manually activated 3.5.1 single-compartment smoke control damper device for use within a single compartment, associated with a single compartment smoke extraction duct conforming to EN 1366-9 3.5.2 multi-compartment fire resisting smoke control damper smoke control damper for use in multi-compartment applications, associated with a smoke extraction duct conforming to EN 1366-8 SIST EN 13501-4:2016

EN 13501-4:2016 (E) 8 3.6 smoke barrier device to channel, contain and/or prevent the migration of smoke (fire effluent) Note1 to entry:

Smoke barriers are also referred to as smoke curtains, smoke blinds or smoke screens. 3.7 smoke and heat exhaust ventilator device specially designed to move smoke and hot gasses out of a construction works under conditions of fire 3.8 powered smoke and heat exhaust ventilator powered device (usually a fan) that is suitable for exhausting hot gasses from a building under fire conditions Note 1to entry:

Such devices are often able to function under fire conditions for a limited period only. 3.9 natural smoke and heat exhaust ventilator device specifically designed to move smoke and hot gasses out of the construction works by buoyancy forces 3.10 extended application result predicted result for performance parameter obtained following the process of extended field of application 3.11 extended application report document reporting extended application results, including all details of the process leading to those results, prepared in accordance with EN 15725 4 Fire scenarios 4.1 General NOTE 1 The essential requirement ‘safety in case of fire’ of the Construction Products Regulation addresses the spread of fire and smoke in a building. To demonstrate satisfaction of this requirement, the fire resistance performance of these components is addressed in this European Standard. Fire resistance shall be assessed using one or more of the levels of thermal attack given in 4.2 to 4.5. NOTE 2 Later clauses of this European Standard identify which attack(s) shall be used for which products. NOTE 3 The various levels of thermal action given in 4.2 to 4.5 reflect different fire scenarios and the standards which specify their translation into practical tests give tolerances for their application. SIST EN 13501-4:2016

EN 13501-4:2016(E) 9 NOTE 4 Other heating curves exist, for example the hydrocarbon curve. Also, for extreme fire scenarios (e.g. traffic tunnels, nuclear plants), more severe conventional curves are specified. These are not, however, used for the classification of products according to this European Standard. 4.2 The standard temperature/time curve (post flash-over fire) The ‘post flash-over’ fire test utilizes the ‘standard temperature/time relationship’ which is a model of a fully developed fire in a compartment and is given by the following relationship: T = 345 log10 (8t + 1) + 20 where t is the time from the start of the test in minutes (min); T is the mean furnace temperature in degrees Celsius (°C). The post flash-over fire curve shall be applied in accordance with EN 1363-1. When applied as a basis for testing, the relationship shall be applied for the full duration of the test. 4.3 The slow heating curve (smouldering fire) The ‘smouldering’ fire test shall only used if the fire resistance performance of the product is expected to be reduced by exposure to temperatures associated with the growth stage of a fire. NOTE It is, therefore, particularly relevant to products whose performance can be dependent upon high heating rates below approximately 500 °C (defined in the ‘standard temperature/time’ curve) for achievement of their classifications (i.e. mainly reactive or intumescent products). The slow heating curve is given by the following relationship: for

´ t
t s 0,25T154t20=+
for t > 21 ()()10T345log8t20120=−++

where t is the time from start of test, in minutes (min); T is the mean furnace temperature in degrees Celsius (°C). The smouldering fire curve shall be applied in accordance with EN 1363-2. 4.4 Constant temperature attack In addition to the heating regimes given above, the evaluation of smoke barriers and smoke and heat exhaust ventilators shall be made using a notional constant temperature attack. The specified temperature and the rate at which the temperature is reached, is specified in the relevant test method. SIST EN 13501-4:2016

EN 13501-4:2016 (E) 10 4.5 Specific thermal actions 4.5.1 Smoke control ducts Multicompartment ducts – standard temperature/time curve. Single compartment ducts – a constant temperature of either 300 °C or 600 °C, following the standard temperature/time curve up to the specified constant temperature. NOTE EN 1366-9 does not include a test for assessing integrity at 300 °C. 4.5.2 Smoke control dampers Multi-compartment dampers – standard temperature/time curve. Single compartment dampers – a constant temperature of either 300 °C or 600 °C, following the standard temperature/time curve up to the specified constant temperature. NOTE EN 1366-10 does not include a test for assessing integrity at 300 °C. 4.5.3 Smoke barriers A constant temperature of 600 °C, following the standard temperature/time curve up to the specified constant temperature. 4.5.4 Powered smoke and heat control ventilators A constant temperature of: 200 °C, reached within 5 min to 10 min, or 300 °C, reached within 5 min to 10 min, or 400 °C, reached within 5 min to 10 min, or 600 °C, reached within 5 min to 10 min, or 842 °C following the standard temperature/time curve up to the specified constant temperature. 4.5.5 Natural smoke and heat exhaust ventilators A constant temperature of 300 °C, increasing the furnace temperature following a gradient as specified in EN 12101-2. A constant temperature of 600 °C, increasing the furnace temperature following a gradient as specified in EN 12101-2. A constant temperature of specified in EN 12101-2. NOTE

SIST EN 13501-4:2016

EN 13501-4:2016(E) 11 5 Resistance to fire performance characteristics 5.1 General NOTE 1 The basic requirement ‘safety in case of fire’ of the Construction Products Regulation requires the products covered in this standard to be assessed against specified characteristics. These include integrity, insulation, stability, smoke leakage and reliability. This clause provides the necessary details of each of the above characteristics. NOTE 2 Where a characteristic may have more than one different definition or type of performance, later clauses identify which specific definition applies to which products. 5.2 Performance characteristics 5.2.1 E – Integrity Integrity E is the ability of a component of a smoke control system to prevent the transmission of fire as a result of the passage of significant quantities of flames or hot gases from the fire to the unexposed side, thereby causing ignition either of the non-fire exposed surface or of any material adjacent to that surface. The assessment of integrity shall be made on the basis of one or more of the following aspects simultaneously: — cracks or openings in excess of given dimensions; — ignition of a cotton pad; — sustained flaming on the non-exposed side; — leakage measurements; — maintenance cross section and mechanical stability. The integrity shall be determined by all methods during the test. The cotton pad procedure shall be applied until the pad ignites and once it has ignited, it shall be withdrawn and the test continued until all aspects have been exceeded (the sponsor has the option, however, of stopping the test once the desired level has been reached). The times of each mode of integrity failure shall be recorded. Classification of integrity is according to whether or not the component is also classified for insulation. Where a component is classified both for integrity E and insulation I, the integrity value shall be that determined by whichever of the four criteria fails first. Where a component is classified E but without an I classification, failure of the cotton pad shall not be taken into account. Where leakage rate is a performance characteristic for integrity, the limit value for different products is given in the relevant clause. Conformity to the requirements for criterion, E, is required for: — multi-compartment smoke control ducts; — single compartment smoke control ducts; — multi-compartment smoke control dampers; SIST EN 13501-4:2016

EN 13501-4:2016 (E) 12 — single compartment smoke control dampers. 5.2.2 I – Insulation Insulation I is the ability of a component of a service installation to withstand fire exposure without the transmission of fire as a result of significant transfer of heat. Heat transfer shall be limited so that non-exposed surfaces or any material in close proximity to that surface is not ignited. The product shall also provide a barrier to heat sufficient to protect people near to it. Conformity to the requirements for criterion, I, is required for: — multi-compartment smoke control ducts; — multi-compartment smoke control dampers. Conformity to the requirements for criterion, I is also required for powered smoke and heat ventilators outside the burning room inside the building. 5.2.3 S – Smoke leakage Smoke leakage S is the ability of a product to resist the passage of smoke under defined temperature and pressure conditions. Conformity to the requirements for criterion, S, is required for: — multi-compartment smoke control ducts; — single compartment smoke control ducts; — multi-compartment smoke control dampers; — single compartment smoke control dampers. 5.2.4 D – Stability duration under constant temperature Stability duration under constant temperature is the ability of a product to resist the passage of gasses or smoke under a constant temperature attack of 600 °C. It includes:

...

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