Universal Security Instruments Bathroom Exhaust Fan with Custom-Designed Motor and 26-Watt Fluorescent Light, 90 CFM, Model BF-904LF Bathroom exhaust fan combines high function with practical design to keep air moving and effectively pull out moisture Comes equipped with a 90-CFM 2-sones motor that is permanently lubricated so that it will not get louder over time Covers 85 to 110 square feet of living space and includes 4-inch duct adaptor with built-in damper Includes an energy-saving 26-watt fluorescent lamp that can operate independently or together with the fan Comes with a three-year limited warranty