Requires two ceiling grilles with housings and wall or roof vent. Consider theAtmospheric-310for single grille applications. This product is not designed for In-Shower applications. For Steam or In-Shower use please see theAtmospheric 410. Superior performance @ Higher Static Optional Dimmable 50W Halogen Lighting May qualify for local utility rebate Remote fan, 230 CFM with mounting bracket Dimensions:11-3/4" Diameter x 9-1/2" Length Housing Composition:ABS - PC Blend Thermo Plastic Air Volume:230 CFM @ 0.20" W.G. Lubrication:Permanently lubricated, sealed ball bearings Protection:Thermal overload, automatic reset Speed Control:100% speed controllable Testing:U.L. Listed; CSA Certified Airstream Temperature Tolerance:Up to 140 degrees F Dimensions:6" Diameter x 6" Length Body Composition:Galvanized Steel, 28 Gauge Blade Composition:Aluminum Blades Type:Removable screen, duct extension Dimensions:10-3/4" L x 8-1/4" W x 5-1/4" H Composition:Galvanized Steel, 28 Gauge Vent Dimensions:8-1/8" L x 8-1/8" W x 7/16" H Duct Extensions:6" Diameter x 12' Length Grille Composition:Polyethylene plastic, UV resistant, brittleness temp -99 degrees F Extension Composition:Galvanized Steel, 28 Gauge Dimensions:6" Diameter x 25' Length Composition:Reinforced grey polyester with fiberglass insulation Operating Temperatures:Max -20 degrees F to 140 degrees F Operating Temperatures:Max 185 degrees F Composition:Liquid water-based sealant, UV resistant, grey Testing:UL-181-B, USDA, FDA, EPA approved