4 inch bathroom ventilation exhaust fan for spaces 100 square feet or less Ultra-quiet operation; 1.0 sone volume (equivalent to soft refrigerator hum) Dissipates humidity, mirror fog, and odors Energy-efficient design; Energy Star certified; 110CFM delivers high-volume air flow Galvanized plate housing, copper motor, polypropylene plastic wind wheel, and ABS plastic grill Includes all necessary hardware, components, and instructions; ceiling hole size 10.8 x 10.5 inches Includes Fan Housing, Grille, Duct Connector, Quick-Connect Wire Connectors, Wood Screws (M4x30 mm), Machine screws (M4x12mm), Suspension Brackets