Model BF-704LH Bath Fan with Light and Heat. 70 CFM Performance. 4.0 Sones. 4 in. Duct Adaptor with Built-In Damper. Exhaust Capacity up to 85 sq. ft. 1100 Watt Heater. 100 Watt Lamp Maximum (not included). Polycarbonate Light Lens. Galvanized Housing Resists Humid Conditions and Changing Attic Temperatures. Housing has Ceiling/Wall Thickness Indicator Markings and Built-In Mounting Tabs for Quick and Easy Installation. Permanently Lubricated Plug-In Motor for Quick Activation. Precision Balanced Blade. Decorative Molded Grille. Independently Tested for CFM and Noise Levels.