Broan-Nutone 509S 8-Inch Utility Fan, Efficient 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.