Amtrak Solar's Powerful 40-Watt Galvanized Steel Roof Mounted Solar Attic Fan Quietly Cools and Ventilates your house, garage or RV and protects against moisture build-up. 40 Watt Solar Panel and Fan at a Great Price! Drastically reduce your cooling bill, and pays for itself in very little time. Removes Hot Air & gives Better Performance than other Solar Attic Fan in its Class.