Fire resistance tests for non-loadbearing elements - Part 4: Curtain walling - Part configuration

This European Standard specifies a method for determining the fire resistance of parts of curtain walling and of the perimeter seal. It examines the fire resistance to internal and external fire exposure of:
-   the spandrel panel, i.e. downstand, upstand or a combination thereof, or
-   the perimeter seal, or
-   the fixing of the framing system (anchoring) used to attach the curtain walling to the floor element, or
-   combinations thereof.
Results from tests according to this standard form the basis for classification of curtain walling type A (see 3.3 for definition).
For curtain walling type B (see 3.4 for definition) results may be used to determine fire resistance of parts of a curtain walling to increase the field of application when previously tested to EN 1364 3. For intended classification EW and for corner/faceted specimens EN 1364 3 should be used.
This European Standard does not cover double skin façades, over-cladding systems and ventilated façade systems on external walls. It does not deal with the reaction to fire behaviour of curtain walling.
This standard is intended to be read in conjunction with EN 1363 1 and EN 1363 2 as well as EN 1364 3 for curtain walling type B.
NOTE   Annex A gives informative guidance on the principles of testing parts of curtain walling and the test method.

Feuerwiderstandsprüfungen für nichttragende Bauteile - Teil 4: Vorhangfassaden - Teilausführung

Diese Europäische Norm legt ein Verfahren zur Bestimmung der Feuerwiderstandsdauer von Teilen der Vorhangfassade und der Rand-Dichtung fest. Sie untersucht den Feuerwiderstand der folgenden Elemente bei Brandbeanspruchung von innen und von außen:
-   Brüstungspaneel, d. h. Schürze, aufgeständerte Brüstung oder eine Kombination daraus;
-   Rand-Dichtung;
-   Befestigung des Rahmensystems (Verankerung) zur Anbringung der Vorhangfassade am Decken-element;
-   Kombinationen dieser Elemente.
Die Ergebnisse der Prüfungen nach dieser Norm bilden die Grundlage für die Klassifizierung von Vorhang-fassaden vom Typ A (siehe 3.3 für die Definition).
Für Vorhangfassaden vom Typ B (siehe 3.4 für die Definition) dürfen die Ergebnisse zur Bestimmung des Feuerwiderstands von Teilen der Vorhangfassade angewendet werden, um den Anwendungsbereich zu erweitern, sofern bereits Prüfungen nach EN 1364 3 durchgeführt wurden. Bei vorgesehener Klassifi-zierung EW sowie bei Probekörpern mit Ecken/facettierten Probekörpern sollte EN 1364 3 angewendet werden.
Die vorliegende Europäische Norm deckt keine Doppelfassaden, Fassadenbekleidungssysteme und hinterlüftete Fassadensysteme an Außenwänden ab. Sie behandelt nicht das Brandverhalten von Vorhang-fassaden.
Diese Norm ist dafür vorgesehen, zusammen mit EN 1363 1 und EN 1363 2 sowie - für Vorhangfassaden vom Typ B - mit EN 1364 3 angewendet zu werden.
ANMERKUNG   Anhang A enthält informative Hinweise zu den Grundsätzen der Prüfung von Teilen von Vorhang-fassaden und zum Prüfverfahren.

Essais de résistance au feu des éléments non-porteurs - Partie 4: Murs rideaux - Configuration partielle

La présente Norme européenne spécifie une méthode permettant de déterminer la résistance au feu de
parties de façade rideau et de l'étanchéité périphérique. Elle étudie la résistance au feu à l'exposition interne
et externe :
⎯ du panneau d'allège, c'est-à-dire panneau d’allège suspendu, en appui ou combinaison des deux ;
ou
⎯ de l'étanchéité périphérique ; ou
⎯ des fixations du système d'ossature (ancrage) utilisées pour attacher la façade rideau à l'élément de
plancher, ci-après désignées en tant que « fixation » ; ou
⎯ de combinaisons de ceux-ci.
Les résultats des essais réalisés conformément à la présente norme servent de base au classement d'une
façade rideau de type A (voir définition en 3.2).
Pour une façade rideau de type B (voir définition en 3.3), les résultats peuvent être utilisés pour déterminer la
résistance au feu de parties de la façade rideau afin d'étendre le domaine d'application, lorsqu'elle a été
préalablement soumise à essai conformément à l'EN 1364-3. Lorsqu'un classement EW est prévu et pour les
éléments d'essai à angles/facettes, l'EN 1364-3 doit être utilisée.
La présente Norme européenne ne couvre pas les façades double peau, les systèmes de bardage et les
systèmes de façades ventilées sur des murs extérieurs. Elle ne traite pas du comportement au feu des
façades rideaux.
La présente norme est destinée à être lue conjointement à l'EN 1363-1 et à l'EN 1363-2 ainsi qu'à l'EN 1364-3
pour une façade rideau de type B.
NOTE L'Annexe A informative donne des lignes directrices concernant les principes et la méthode d'essai de parties
de façade rideau.

Preskusi požarne odpornosti nenosilnih elementov - 4. del: Obešene fasade - Delna fasada

General Information

Status
Published
Publication Date
04-Feb-2014
Current Stage
9092 - Decision on results of review/2YR ENQ - revise - Review Enquiry
Completion Date
17-Feb-2020

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Preskusi požarne odpornosti nenosilnih elementov - 4. del: Obešene fasade - Delna fasadaFeuerwiderstandsprüfungen für nichttragende Bauteile - Teil 4: Vorhangfassaden - TeilausführungEssais de résistance au feu des éléments non-porteurs - Partie 4: Façades rideaux - Configuration partielleFire resistance tests for non-loadbearing elements - Part 4: Curtain walling - Part configuration91.060.10Stene. Predelne stene. FasadeWalls. Partitions. Facades13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elementsICS:Ta slovenski standard je istoveten z:EN 1364-4:2014SIST EN 1364-4:2014en,fr,de01-april-2014SIST EN 1364-4:2014SLOVENSKI

STANDARDSIST EN 1364-4:20071DGRPHãþD
SIST EN 1364-4:2014
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 1364-4
February 2014 ICS 13.220.50; 91.060.10 Supersedes EN 1364-4:2007English Version

Fire resistance tests for non-loadbearing elements - Part 4: Curtain walling - Part configuration

Essais de résistance au feu des éléments non-porteurs - Partie 4: Façades rideaux - Configuration partielle

Feuerwiderstandsprüfungen für nichttragende Bauteile - Teil 4: Vorhangfassaden - Teilausführung This European Standard was approved by CEN on 9 November 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
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
CEN-CENELEC Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2014 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 1364-4:2014 ESIST EN 1364-4:2014

EN 1364-4:2014 (E) 2 Contents Page Foreword ..............................................................................................................................................................4 Introduction .........................................................................................................................................................5 1 Scope ......................................................................................................................................................6 2 Normative references ............................................................................................................................6 3 Terms and definitions ...........................................................................................................................7 4 Test equipment ......................................................................................................................................8 4.1 General testing principles .....................................................................................................................8 4.2 Furnace configuration ...........................................................................................................................9 4.3 Supporting floor .....................................................................................................................................9 5 Test conditions ......................................................................................................................................9 6 Test specimen ..................................................................................................................................... 10 6.1 Size ....................................................................................................................................................... 10 6.2 Number of specimens ........................................................................................................................ 10 6.3 Design .................................................................................................................................................. 10 6.3.1 General ................................................................................................................................................. 10 6.3.2 Standard configuration ...................................................................................................................... 11 6.3.3 Restraint of the specimen .................................................................................................................. 11 6.3.4 Surfaces ............................................................................................................................................... 12 6.3.5 Perimeter seal ..................................................................................................................................... 12 6.4 Construction ........................................................................................................................................ 13 6.5 Verification .......................................................................................................................................... 13 7 Installation of the test specimen ....................................................................................................... 13 7.1 General ................................................................................................................................................. 13 7.2 Supporting floor .................................................................................................................................. 13 7.2.1 Standard supporting floor ................................................................................................................. 13 7.2.2 Non-standard supporting floor .......................................................................................................... 13 7.3 Furnace closure .................................................................................................................................. 14 7.4 Fixing of the framing system ............................................................................................................. 14 8 Conditioning ........................................................................................................................................ 14 9 Application of instrumentation .......................................................................................................... 14 9.1 Thermocouples ................................................................................................................................... 14 9.1.1 Furnace thermocouples (plate thermometers) ................................................................................ 14 9.1.2 Unexposed face thermocouples ....................................................................................................... 14 SIST EN 1364-4:2014

EN 1364-4:2014 (E) 3 9.2 Pressure ............................................................................................................................................... 17 9.3 Radiation .............................................................................................................................................. 17 10 Test procedure ..................................................................................................................................... 17 11 Performance criteria ............................................................................................................................ 17 12 Test report ............................................................................................................................................ 18 13 Field of direct application of test results .......................................................................................... 19 13.1 Rules for curtain walling type A ......................................................................................................... 19 13.1.1 General rules ........................................................................................................................................ 19 13.1.2 Rules for the complete construction ................................................................................................. 19 13.1.3 Framing system ................................................................................................................................... 21 13.1.4 Spandrel panels ................................................................................................................................... 24 13.2 Rules for curtain walling type B ......................................................................................................... 28 13.3 Perimeter seal ...................................................................................................................................... 28 13.3.1 General ................................................................................................................................................. 28 13.3.2 Material ................................................................................................................................................. 28 13.3.3 Width/depth .......................................................................................................................................... 29 13.3.4 Fixing of the perimeter seal ................................................................................................................ 29 13.3.5 Covering ............................................................................................................................................... 29 13.4 Supporting floor .................................................................................................................................. 29 Annex A (informative)

Guidance on testing curtain walling – part configuration ...................................... 44 A.1 Standard configuration ....................................................................................................................... 44 A.1.1 General ................................................................................................................................................. 44 A.1.2 Supporting floor .................................................................................................................................. 44 A.1.3 Parts of a curtain walling .................................................................................................................... 44 A.1.4 Specimen selection ............................................................................................................................. 45 A.2 Test principles and requirements ...................................................................................................... 45 A.3 Fire from the inside ............................................................................................................................. 47 A.3.1 General ................................................................................................................................................. 47 A.3.2 Curtain walling type A ......................................................................................................................... 47 A.3.3 Curtain walling type B ......................................................................................................................... 47 A.3.4 Perimeter seal ...................................................................................................................................... 48 A.3.5 Fixing of the framing system.............................................................................................................. 48 A.4 Fire from the outside ........................................................................................................................... 48 Annex B (normative)

Standard configurations .............................................................................................. 51 Annex C (normative)

Radiation calculation ................................................................................................... 56 Annex D (normative)

Field of direct application of test results for unitised construction ....................... 59 D.1 Rules for curtain walling type A ......................................................................................................... 59 D.1.1 General ................................................................................................................................................. 59 D.1.2 Exposure conditions ........................................................................................................................... 59 D.1.3 Rules for the complete construction ................................................................................................. 59 D.1.4 Spandrel panels ................................................................................................................................... 59 D.2 Rules for curtain walling type B ......................................................................................................... 59 Bibliography ...................................................................................................................................................... 60

SIST EN 1364-4:2014

EN 1364-4:2014 (E) 4 Foreword This document (EN 1364-4:2014) 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 August 2014, and conflicting national standards shall be withdrawn at the latest by August 2014. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document supersedes EN 1364 −4t200q. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association, and supports essential requirements of 89/106/EEC. 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 1364-4:2014

EN 1364-4:2014 (E) 5 Introduction WARNING The attention of all persons concerned with managing and carrying out this fire resistance test is drawn to the fact that fire testing can be hazardous and that there is a possibility that toxic and/or harmful smoke and gases can be developed during the test. Mechanical and operational hazards can also arise during the construction of the test elements or structures, their testing and disposal of test residues. An assessment of all potential hazards and risks to health should be made and safety precautions should be identified and provided. Written safety instructions should be issued. Appropriate training should be given to relevant personnel. Laboratory personnel should ensure that they follow written safety instructions at all times. SIST EN 1364-4:2014

EN 1364-4:2014 (E) 6

1 Scope This European Standard specifies a method for determining the fire resistance of parts of curtain walling and of the perimeter seal. It examines the fire resistance to internal and external fire exposure of: — the spandrel panel, i.e. downstand, upstand or a combination thereof, or — the perimeter seal, or — the fixing of the framing system (anchoring) used to attach the curtain walling to the floor element, or — combinations thereof. Results from tests according to this standard form the basis for classification of curtain walling type A (see 3.3 for definition). For curtain walling type B (see 3.4 for definition) results may be used to determine fire resistance of parts of a curtain walling to increase the field of application when previously tested to EN 1364-3. For intended classification EW and for corner/faceted specimens EN 1364-3 should be used. This European Standard does not cover double skin façades, over-cladding systems and ventilated façade systems on external walls. It does not deal with the reaction to fire behaviour of curtain walling. This standard is intended to be read in conjunction with EN 1363-1 and EN 1363-2 as well as EN 1364-3 for curtain walling type B. NOTE Annex A gives informative guidance on the principles of testing parts of curtain walling and the test method. 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 1364-3, Fire resistance tests for non-loadbearing elements - Part 3: Curtain walling - Full configuration (complete assembly) EN 13119, Curtain walling - Terminology EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification using data from reaction to fire tests EN 13501-2, Fire classification of construction products and building elements — Part 2: Classification using data from fire resistance tests, excluding ventilation services EN 13830, Curtain walling - Product standard EN ISO 13943, Fire safety - Vocabulary (ISO 13943) SIST EN 1364-4:2014

EN 1364-4:2014 (E) 7 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1363-1, EN 13119, EN 13830,

EN ISO 13943 and the following apply. 3.1 anchoring see fixing of the framing system 3.2 associated wall construction form of construction required to close the vertical side of the furnace (not part of the test specimen) 3.3 curtain walling type A curtain walling without fire resistant glazing outside the spandrel area – fire resistant only in the spandrel area 3.4 curtain walling type B curtain walling with fire resistant glazing outside the spandrel area - fully fire resistant curtain walling 3.5 downstand special type of spandrel panel, hanging down from or located in front of the floor Note 1 to entry: See Figure A.2. 3.6 fire-resistant glazing glazing system consisting of one or more transparent or translucent panes with a suitable method of mounting, with e.g. frames, seals and fixing materials, capable of satisfying the appropriate fire resistance criteria 3.7 fire resistant translucent or transparent spandrel panel glass product, monolithic, laminated or insulating glass unit, manufactured by a particular manufacturer and intended to be used as spandrel panel in curtain walling, which is CE marked based on a classification according to EN 13501-2 in minimum one glazed construction Note 1 to entry: The term “insulating” when used with “insulating glass unit” according to EN 1279–1, should not be confused with the term “insulation” used in classification standard EN 13501–2. 3.8 fixing of the framing system system used to attach the curtain wall to the loadbearing floor. It contains the brackets but not the anchor or other devices used to fix the brackets to the floor 3.9 glazing materials all materials used to glaze the fire resistant translucent or transparent spandrel panel into its frame 3.10 horizontally faceted curtain walling curtain walling with an angle between horizontally adjacent infill panels at the common mullion (see Figure 1) 3.11 insulating glass unit (IGU) glass product according to EN 1279–1 SIST EN 1364-4:2014

EN 1364-4:2014 (E) 8 3.12 over-cladding system protection system fixed to an external wall for weather protection 3.13 overrun time time of fire resistance in minutes beyond the envisaged classification time, achieved in the test 3.14 perimeter seal see EN 13119 3.15 standard configuration standard arrangement of curtain walling components in a test specimen 3.16 supporting floor representation of a floor, forming part of the test construction, to allow the fixing of the test specimen of the curtain walling and the installation of the perimeter seal 3.17 upstand special type of spandrel panel, standing up from or located in front of the floor Note 1 to entry: See Figure A.2. 4 Test equipment 4.1 General testing principles Table 1 defines which specific standard test configuration may be used for each part of the curtain walling depending on the type of fire exposure and type of curtain walling. The test equipment specified in EN 1363-1 and EN 1363-2 shall be used where applicable. SIST EN 1364-4:2014

EN 1364-4:2014 (E) 9 Table 1 — Standard test configurations and exposure conditions Product / component of curtain walling Type of curtain walling a Fire exposure / heating conditions Test configuration (see Annex B) Surfaces Spandrel panel (upstand, downstand or combinations thereof) A Internal (STC) + external (ef) b 1 S3 Internal (STC) + external (STC) c 2 S3 B Internal (STC) 3 S2, S3 External (STC or ef) d 4 S1 Perimeter seal A Internal (STC) 1, 5 - B Internal (STC) 3, 5 - Fixing of the framing system A Internal (STC) 1, 5 - B Internal (STC) 3, 5 - ef External fire curve as specified in EN 1363–2. STC Standard temperature / time curve as specified in EN 1363–1. For more information on the test configuration depending on the heating exposure and explanation, see Table A.1. a For definition of type of curtain walling see 3.2 and 3.3 b In case the requirement for the external fire exposure is the external fire curve as specified in EN 1363–2. c In case the requirement for the external fire exposure is the standard temperature/time curve as specified in EN 1363–1. d Depending on national requirements. 4.2 Furnace configuration A floor or a wall furnace may be chosen. The minimum dimensions of the furnace are given in Figures B.1 to B.5. For the installation of the specimen, wall or floor furnaces shall be modified, if necessary, to accommodate the three-dimensional construction. The three dimensional construction includes the perimeter seal. The test according to EN 1364-4 is performed on a three-dimensional specimen to allow an exposure of a number of surfaces of the upstand/downstand (spandrel area) and incorporates a supporting floor, which provides the support for the curtain walling. 4.3 Supporting floor A supporting floor is provided as a base for the attachment of the fixing of the framing system and as a location for the perimeter seal under examination. If information on the fire resistance of the curtain walling in conjunction with a particular type of floor construction is required, such a construction shall be used, see 7.2. 5 Test conditions The pressure conditions and the furnace atmosphere shall conform to those given in EN 1363-1, subject to a nominal pressure of 20 Pa at the positions shown in Figures B.1 to B.5. The heating conditions shall conform to those given in EN 1363-1 and/or EN 1363-2 for the test configuration selected as given in Table 1. For details see Annex B. SIST EN 1364-4:2014

EN 1364-4:2014 (E) 10 6 Test specimen 6.1 Size The size of the test specimen shall be as follows: a) the height of the spandrel area as in practice (normally about 1 m), b) if the width of the curtain walling in practice is less than 3 m, the specimen shall be full size as in practice, c) if the width of the curtain walling in practice is larger than 3 m, the width of the specimen shall be not less than 3 m. NOTE 1 A width larger than 3 m may be the result of single panels with a width of more than 3 m or the result of the repetition of smaller construction units (mullion distance < 3m). NOTE 2 The height depends on national requirements. Where the width of a single spandrel panel (upstand/downstand) is less than 3 m, at least 3 panels with the mid panel at the maximum dimension shall be incorporated in the test specimen. Where the width of the panel is greater than or equal to 3 m, at least 3 panels with the mid panel at the maximum width shall be incorporated in the test specimen. The outer panels may be cut, subject to a minimum clearance between the mullions at the boundary of the mid panel and the inner surface of the furnace of 200 mm. The height h is the total of upstand and downstand (spandrel area). If the height of the specimen is smaller than the vertical opening of the furnace, the furnace opening shall be closed with a furnace closure according to 7.3. 6.2 Number of specimens The performance of curtain walling or parts of curtain walling type A for internal and external exposure shall be determined from a single test where the specimen is heated from both sides. For details see Annex B. For curtain walling type B separate tests shall be performed for internal and external exposure. NOTE Depending on national requirements the external exposure may be the external fire curve as specified in EN 1363–2 or the standard temperature/time curve as specified in EN 1363–1. 6.3 Design 6.3.1 General The test specimen shall be: — either fully representative of the construction intended for use in practice, including fixing of the framing system, expansion joints, perimeter seals, any surface finishes and fittings which are essential and may influence its behaviour in the test, or — a standard configuration as defined in Annex B. NOTE The use of a standard configuration allows the use of field of application rules to obtain the widest applicability of the test result to other similar constructions. The test specimen shall consist of parts of the curtain walling. It shall fully represent the construction on which information is required. For use of field of application rules, one of the standard configurations given in Table 1 as described in Annex B shall be used, see Clause 13. The test specimen shall consist of: SIST EN 1364-4:2014

EN 1364-4:2014 (E) 11 — the curtain walling part, — the perimeter seal and — the fixing of the framing system. If the scope of the test is the perimeter seal and movement capability is intended to be considered (see A.3.4) the fixing may be omitted. All design features which influence fire resistance performance shall be included. If the scope of the test includes an assessment of the fixing of the framing system additional load may be required to take account of the part of the curtain walling not included in the test. 6.3.2 Standard configuration 6.3.2.1 General A straight test specimen shall comprise a section of the curtain walling with minimum two mullions or two vertical joints between panels in case of systems without frame or mullions, fully exposed to the fire, see Figure 2. In case a T-connection and/ or cross connection is intended to be included these shall be located in the heated area. A transom shall be used on top and bottom of the spandrel panel except it is the intention of the test to demonstrate the performance of panels not fixed on top or bottom. A faceted specimen shall comprise minimum four sections of the curtain walling forming minimum one corner of 90 degrees and two angles of 135 degrees, all sections with a minimum width of 500 mm, minimum three sections with a width of minimum 1000 mm, see Figures 3A to 3D for examples. Two such specimens may be combined to a specimen forming two corners of 90 degrees and two angles of 135 degrees, see Figures 3E and 3F for examples. In case a transom is located in front of the floor slab in practice the test specimen shall also contain a transom in front of the supporting floor. Such a transom is not considered being part of the perimeter seal but part of the framing. A supporting floor shall be used for standard configurations 1, 2, 3 and 5. The design of the standard supporting floor is given in 7.2.1. 6.3.2.2 Test configuration for curtain walling type A The test specimen shall be heated from both sides at the same time. Depending on the requirements for the external exposure the heating of conditions of the standard temperature/time curve as specified in EN 1363-1 are maintained on one side only or on both sides of the specimen – for details see Figures B.1 and B.2. 6.3.2.3 Test configuration for curtain walling type B The test specimen shall be heated only from one side. In standard configurations for curtain walling type B the furnace closure or fire-resistant glazing may be positioned directl

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