Where fire dampers are installed, does the specification of externally applied ductwork acoustic/thermal insulation matter?
A. Yes. Any insulation within 500mm of a fire damper should be either a non combustible material or a material of limited combustibility. A material can be considered as being of limited combustibility if its reaction to fire performance meets the requirements of Table 1 below reproduced from Table A7 of Approved Document B. The fire performance of such materials may be demonstrated by testing to either British Standards or European Standards.
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