Broan 502 Wall-Ceiling Mount Side Discharge Utility Fan, 10-Inch 270 CFM 8.0 Sones 270 CFM 8.0 Sones Installs easily between ceiling joists or wall studs Built-in damper prevents backdrafts Fits 3-1/4 inches by 10 inches duct Eliminate humidity from laundry rooms, tobacco smoke from rec rooms and workshops, or cooking fumes from kitchens with Broan's high-efficiency utility ventilators