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Fire resisting ductwork - tested to BS 476 Part 24 (Blue book). British Standard version. 2nd edition (Withdrawn)

Fire resisting ductwork - tested to BS 476 Part 24 (Blue book). British Standard version. 2nd edition (Withdrawn)

Document Status

Withdrawn, Document not available for download


Core Supplement


Intended to ensure that fire resisting ductwork (including smoke outlet) is correctly designed and installed in accordance with current UK legislative requirements. Provides information on current British Standard fire resistance and reaction-to-fire tests, together with recommended methods for appraisal systems for both direct and extended fields of application, and requirements for duct systems incorporating penetration seals, support systems and ancillary items. Identifies limitations in the scope of the guidance.


Superseded by Fire resisting ductwork - tested to BS 476 Part 24 (Blue book). British Standard version. 3rd edition Volume 1 and Volume 2. (ADFP, 2016). This document is no longer current but is cited in the Building Regulations for England and Wales. See also, "Fire resisting ductwork - classified according to BS EN 13501 Parts 3 and 4 - European version (Blue book). 1st edition. (ASFP, 2009)". Published by the ASFP in conjunction with HVCA. Amended in 2010 and 2011.




Publisher History

Formed in 1975, the Association for Specialist Fire Protection currently represents the major U.K. based specialist manufacturers and installers of structural passive fire protection systems. They produce technical information to ensure built in fire protection in buildings.



NBS has produced specification systems and information products for construction industry professionals for more than 40 years. The National Building Specification is the recognised UK national standard and is used by over 5,000 organisations. NBS is part of RIBA Enterprises Ltd.


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