Honeywell 527SHON104BLK 20-Watt Roof Mount Solar Powered Attic Fan Ventilates up to 1850-square-feet Thermostat controlled Adjustable commercial grade 20-watt solar panel Limited 5-year warranty on motor and 20-year warranty on solar panel May qualify for federal and/or local tax rebate Ventilates up to 1850 square feet Thermostat controlled Adjustable commercial grade 20 watt solar panel Limited 5 Year Warranty on Motor - 20 Year Warranty on Solar Panel May qualify for federal and/or local tax rebate