Many local codes require that exhaust fans installed in fire-rated ceilings must be protected by dampers, which, in case of fire, protect against the spread of heat and flame. Broan offers a variety of radiation/fire damper solutions to meet most any need. Housings and finishes (motor assembly and grille) sold separately in units of four per carton - purchase housings for rough-in and blower assemblies/grilles later for finishing UL classified (UL standard 555C) for use in 1-, 2-, or 3-hour fire-rated floor-ceiling and roof-ceiling designs Warnock Hersey Listing allows use in combustible ceilings with ducted fans High temperature, non-asbestos, reinforced fiber thermal fabric Galvanized steel frame 165°F fusible link Stainless steel negator-type closure spring available from 50 CFM to 110 CFM Radiation damper comes attached to housing Blower assembly will fit into housing without the removal of the radiation damper - one less step in installation process.
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