Air King AK80H Energy Star Quiet Series Humidity Sensing Bath Fan, 80-CFM, White Fan's grill measures 11" x 13-3/4" and housing measures 10-7/8" in length x 9-3/8" in width x 7-7/8" in depth Operates at 80 CFM at a very quiet 1.0 scones Integrated humidstat senses when to turn fan on or off: when humidity level reaches preset level, the fan turns on; when humidity level is below the preset level, the fan turns off Comes with 4" round plastic duct connector with damper for superior back draft protection, and side access panel makes for easy wiring without having to remove the interior components Fan is HVI-certified, UL-listed for safe installation over a tub or shower on a GFCI circuit, satisfies California Title 24 guidelines, meets ASHRAE 62.2 requirements and those of the ARRA, is CAL Green compliant and LEED for homes Energy Star humidity sensing bath fan with contoured grill 80-CFM blower at 1.0-sone for quiet operation Exhaust capacity for rooms of approximately 75 to 100-square feet Easily install by using the included adjustable hanging brackets Comes with a 5-year limited warranty