180 CFM, 8", Utility Fan, 6.5 Sones, Efficient Ventilation For Kitchens, Laundry Rooms, Recreation Rooms Or Workshops, Built In Damper Prevents Backdrafts, 11-1/2" Square White Polymeric Grille, Paintable, Removable Easy To Clean Permanently Lubricated Motor With Twist Lock Installation, Built In Backdraft Damper, HVI Certified At 180 CFM, Includes Built In On/Off Rotary Switch, No Wall Switch To Install, Adjusts To Fit Walls 4-1/2" To 9-1/2" Thick, 8-3/8" Diameter Steel Housing, Fits 8-1/4" Round Opening, 14-1/4" Square Outside Flange, Fiberglass Reinforced Polymeric Fan Blade.