Broan 80RDF Finish Pack, Blower with Metal Grille 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. 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.