Solar Attic Fan 36-watt with 25-Year Warranty - Florida Rated 36 watt unit can fully vent up to 2,500 square feet. Exhausts at up to 1,628 cfms (cubic feet per minute) for up to 2625 Sq. Ft. Easily installed with No wiring required. Qualified for 30% Solar Federal tax credits. 25-Year warranty on motor, housing and solar panel.