Let the sun cool your attic with this solar powered attic fan! This attic fan is fully assembled,can be installed in an afternoon, uses NO fossil fuels , can cool your attic by as much as 50 degrees, saving you about 30% on your summer cooling costs. The 850 model can move up to 850 cfm and will cool up to 1200 sq. ft. of attic space. Made in in the USA of 70% recycled plastic - qualifies for 30% Federal Tax credit and 50% Indiana tax credit!Flat base for pitched roofs