Does fire resisting ductwork require any fire insulation criteria in all circumstances?
ANSWER – When the specification is for a prescribed period of fire resistance then all fire resistance criteria shall apply, in terms of the load-bearing capacity (stability), integrity and insulation criteria. Removal of the insulation criteria shall only apply in exceptional circumstances It is a requirement that where these compartment walls/floors are penetrated by ducts or other building services, the fire performance criteria for the penetrated wall or floor are maintained, such that fire in one compartment may not spread to other areas. In specific installations, Building Control authorities may waive the insulation requirement or allow a reduced period of insulation, Examples include some car parks, where enforcers have considered that there was not a possibility of combustible materials being in close proximity of the ductwork.
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