I've been using this brand of fan in the coop for over a year now and going strong. I actually have 3 of them in different sizes. All work great.My coop is so small that they have to be window sized rather than the huge exhaust fans. It is possible that they just don't make small ones. I could use a household one, but their motors just aren't made for all that dust.
http://www.acehardware.com/product/index.jsp?productId=18201726
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