Amtrak Solar's Powerful 70-Watt Galvanized Steel Solar Attic Fan Cools your House Ventilates your house, garage or RV and protects against moisture build-up 70 Watt Solar Panel 3 Times More Powerful than Most Competition New 10 Inch Fan Blade. Powerful enough to open louver. Easy to install with quick-connect wires. Most Powerful Fan Motor 25 Year Warranty Made in USA. Free thermostat (optional)