"This Tamarack Whole House Fan lets you enjoy a cooler home while running your air conditioner less. Using less energy than a 100-watt bulb, this super-efficient whole house fan cools your home with outside air. U.S.A. Air Delivery CFM 1,450, Power Cord ft. Hardwire, Volts 115, Speeds qty. 1, Amps 0.65, Watts 70. Easily installs in attic on 16in. or 24in. on-center attic floor joists Adjust the air flow to suit your needs with a speed control not included Requires hardwire electrical connection for power and fan control UL listed"