8-Inch Utility FanEfficient 180 CFM, 6. 5 Sones ventilation for kitchens, laundry rooms, recreation rooms or workshops, built in damper prevents backdrafts, 11 1 2 inch square white polymeric grille is paintable and removable so it's easy to clean. No wall switch to install, adjusts to fit walls 4 1 2 to 9 1 2 inch thick; 8 3 8 inch diameter steel housing, fits 8 1 4 inch round opening, 14 1 4 inch square outside flange, fiberglass reinforced polymeric fan blade.