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BS 476-24:1987

Current

Current

The latest, up-to-date edition.

Fire tests on building materials and structures Method for determination of the fire resistance of ventilation ducts

Available format(s)

Hardcopy , PDF

Language(s)

English

Published date

30-04-2014

National foreword
Committees responsible
Method
0 Introduction
1 Scope and field of application
2 Reference
3 Principle
4 Apparatus
5 Test conditions
6 Preparation of test specimens
7 Test arrangements
8 Procedure
9 Performance criteria for expression of fire
   resistance
10 Test report
Annexes
Explanatory notes

Defines a method of tests and criteria for the determination of the fire resistance of vertical and horizontal ventilation ducts under standardized fire conditions.

1.1 This International Standard specifies a method of test and criteria for the determination of the fire resistance of vertical and horizontal ventilation ducts under standardized fire conditions. 1.2 The general purpose of this test is to measure the ability of a representative duct or duct assembly to resist the spread of fire from one fire compartment to another without the aid of fire dampers. 1.3 It is applicable to vertical and horizontal ducts, with or without branches, taking into account joints, air supply and exhaust openings, as well as suspension devices, etc. 1.4 This International Standard is not applicable to: ducts above fire-resisting suspended ceilings (horizontal membranes) in those cases where the ducts rely for their fire resistance on the performance of the ceiling; NOTE – Other tests are necessary for these ducts. ducts containing fire dampers at points where they pass through fire separations. NOTE – In order to assess the fire resistance of fire dampers, other tests are required. A method of test for fire dampers is under consideration as a subject for a future International Standard. 1.5 This International Standard is not appropriate for the following ducts unless the further criteria described in the an­ nex are established to the satisfaction of the appropriate authority: ducts of materials which are extremely sensitive to thermal shock; NOTE – Thermal shock may affect such ducts in a way that would differ from the effect in this test, but the test may still be used where it can be established that sensitivity to thermal shock is within acceptable limits. smoke outlet ducts; NOTE – These ducts need to retain their integrity and cross­ sectional area under fire conditions. Consequently criteria for ac­ ceptance additional to those given in this International Standard are required. This International Standard is only applicable, therefore, to smoke outlet ducts if the criteria for integrity failure of a representative smoke outlet duct within the furnace and the loss of retention of cross-sectional area of such ducts are agreed between all parties concerned and are investigated and reported (see the annex). ducts lined on the inside with combustible material or which in practice may accumulate combustible deposits on their inside face (such as kitchen extract ducts). NOTE – Additional criteria regarding the insulation performance of the duct are required in this case (see the annex). 1.6 This International Standard does not take into consideration the effect of impact shock loading on ducts due to the collapse of supporting or adjacent structural members or other components, or of impact- or thermal shock loading resulting from the application of a water (hose) stream. NOTE – The method described in this International Standard should be used solely to measure and describe the properties of ducts and their supports in response to heat and flame under controlled laboratory conditions and should not by itself be considered or used for the description. appraisal or regulation of the fire hazard of such ducts or supports under actual fire conditions.

Committee
FSH/22
DevelopmentNote
Together with BS 476-20(1987), BS 476-21(1987), BS 476-22(1987) and BS 476-23(1987), it supersedes BS 476-8(1972). Also numbered as ISO 6944. Supersedes 84/37753 DC. (07/2005) To be read in conjunction with BS 476-20(1987). (05/2014)
DocumentType
Standard
Pages
24
PublisherName
British Standards Institution
Status
Current
Supersedes

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07/30147204 DC : 0 BS 476-10 - FIRE TESTS ON BUILDING MATERIALS AND STRUCTURES - PART 10: GUIDE TO THE PRINCIPLES, SELECTION, ROLE AND APPLICATION OF FIRE TESTING AND THEIR OUTPUTS
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BS 5588-8:1999 Fire precautions in the design, construction and use of buildings Code of practice for means of escape for disabled people
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PD 7974-3:2011 Application of fire safety engineering principles to the design of buildings Structural response and fire spread beyond the enclosure of origin
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BS 476-10:2009 Fire tests on building materials and structures Guide to the principles, selection, role and application of fire testing and their outputs
BS 5908:1990 Code of practice for fire precautions in the chemical and allied industries
BS 8313:1997 Code of practice for accommodation of building services in ducts
11/30203947 DC : 0 BS 9991 - FIRE SAFETY IN THE DESIGN, MANAGEMENT AND USE OF RESIDENTIAL BUILDINGS - CODE OF PRACTICE
BS 476-10:1983 Fire tests on building materials and structures Guide to the principles and application of fire testing
BS 8519:2010 Selection and installation of fire-resistant power and control cable systems for life safety and fire-fighting applications. Code of practice
BS 476-20:1987 Fire tests on building materials and structures Method for determination of the fire resistance of elements of construction (general principles)
PD 7974-3:2003 Application of fire safety engineering principles to the design of buildings Structural response and fire spread beyond the enclosure of origin (Sub-system 3)
BS 5588-11:1997 Fire precautions in the design, construction and use of buildings Code of practice for shops, offices, industrial, storage and other similar buildings
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16/30314117 DC : 0 BS 9999 - FIRE SAFETY IN THE DESIGN, MANAGEMENT AND USE OF BUILDINGS - CODE OF PRACTICE
PD 6520:1988 Guide to fire test methods for building materials and elements of construction
BS 5588-9:1989 Fire precautions in the design, construction and use of buildings Code of practice for ventilation and air conditioning ductwork
BS 476-23:1987 Fire tests on building materials and structures Methods for determination of the contribution of components to the fire resistance of a structure
BS 476-22:1987 Fire tests on building materials and structures Method for determination of the fire resistance of non-loadbearing elements of construction

BS 476-20:1987 Fire tests on building materials and structures Method for determination of the fire resistance of elements of construction (general principles)
ISO 834:1975 Fire-resistance tests — Elements of building construction

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