Panasonic FV-08WQ1 WhisperWall 70 CFM Wall Mounted Fan Designed specifically for through-the-wall mounting to provide ventilation in rooms where a ceiling mounted fan is not possible Blower wheel is designed to draw air in both sides allowing more area for air to enter the wheel Continuous, trouble-free operation for many years due to high-quality components and permanently lubricated motors This Panasonic wall mounted ventilating fan uses a propeller fan driven by a capacitor motor. The motor is designed for extended service life with reduced energy consumption. It also incorporates a thermal-cutoff device for safety. The grille is easily detachable from the main unit .An exterior hood with a back-draft damper is included Rated 70 cubic feet per minute. Master Carton Dimensions (HxWxD) : 11.06 x 23.25 x 11.06 inches Duct diameter shall be 8-Inch