I just found this, while looking for a solar fan for the vents in the eves in the coop. Of course it won't work for the bigger coops, but the smaller coops and tractors it would.
http://www.samsclub.com/sams/shop/product.jsp?productId=prod2390223
http://www.samsclub.com/sams/shop/product.jsp?productId=prod2390223
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