Next generation WhisperWarm DC™ packs a slew of new features to deliver healthy air and instant warmth to chilly bathrooms. A powerful new ECM motor and larger 1600 W heating element enables builders and remodelers to enjoy easy, code compliant installations, while delivering high output exhaust ventilation and space heating for occupants. Panasonic WhisperWarm DC™ Ventilation Fan/Heater, Precision Spot, 50/80/110 cfm Flow Rate, 4 or 6 in Diameter Duct, 120 V, 0.5 A, 60 Hz Frequency, 4.7/7.7/12 W Power, 1600 W Heater Wattage, 16 in L x 10-1/4 in W x 7-1/2 in H Housing, Ceiling Mounting, 18-1/4 in L x 13-1/4 in W Grille, Polypropylene Grille, 26 ga Zinc-Aluminum-Magnesium Housing Material