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. This housing is designed for model 110RDF, 80RDF, and HD50RDGF finish packs.Includes hanger bars.
Duct Size: 4"