Looks like more very hot days ahead this summer. One of my fans for the coop bit the dust (literally) so I picked up another today at Walmart. This one is specifically for dusty areas, as it has a sealed motor. The ones I had been using did not have that feature. As a plus, this one moves more air (7,000 CFM), even though they all have been 20 inchers. Plus this one is heavier. I could get the old ones I had been using for under $30 on sale at Menards, but this one was not on sale and set me back about $50. I think it will last a lot longer, as the old ones wore out after about one to one and a half seasons. I have not lost any birds to the heat so far, but I do keep the air moving inside the two buildings when it is hot.