Ventilation Extract

Ventilation Ductwork should be tested for Type A (fire outside) and Type B (fire inside) to BS 476 part 24 for a specified time of Stability, Integrity and Insulation (if required).

Ventilation ducts that cross an escape corridor are deemed escape route ducts and in accordance with BS9999:2008, clause 33.4.2, escape route ventilation ducts must be fire rated.

Ventilation ductwork used as part of a pressurisation system must be fire rated and tested as Type A and Type B. Typically used to protected stairways, lobbies, corridors and firefighting shafts, a pressurisation system will provide a positive pressure in defined compartments to prevent smoke entering from adjacent areas. Pressurisation ducts must be able to maintain an air supply to the defined areas for the specified time limits, as defined in terms of Stability and Integrity.

Air supply must be maintained, fire dampers cannot be used.

Fire resisting ductwork may prove to be a cost effective alternative to fire dampers in general ductwork systems (particularly over the lifetime of a building).

System Description Material Stability & Integrity Insulation
Ventilation / Pressurisation Galvanised Mild Steel Up to 4 Hours Up to 2 Hours*

*Insulation values are obtained through the application of specific insulation

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Environment

Non Coated galvanized ductwork has significant commercial and environmental savings on systems using intumescent or flame retardant coatings that require energy and chemicals to degrease, etch, prime , paint and dry but also alleviates the inherent problems of damaging these coatings during assembly and installation and compromising the fire resistance of a coated system.

LPCB
LPS-SD198(appendix B12)
BS476 part 24 1987
Cert - LPCB Ref 1345a

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