Fan/light/heater unit combines instant infrared warmth and ventilation in 1 unit. Ventilator has molded centrifugal blower wheel. 10-1/4 In. x 15-5/8 In. grille. Housing dimensions: 11-5/8 In. x 14-1/4 In. x 6-3/8 In. high. Uses (2) 250-watt infrared bulbs, not included. Exhaust capacity HVI (Home Ventilating Institute) certified at 70 CFM (cubic feet per minute), 3.5 Sones. Suitable for use with insulation. Control with P68 series switch, sold separately. UL (Underwriter's Laboratories) listed.