We purchased a few of these for our barn. They work well and are almost silent on low.
I was hoping they could be hosed off at the end of the cooling season but even though they are described as "waterproof", they are only rated for water resistance like indirect rain. I don't understand why they say water proof. The rating excludes direct streams.
Second, albeit minor issue is the wall mount bracket interferes with the ability to rotate the fan. It would be nice if you can rotate 90 degrees, but more like 45. You can use a longer bolt and bushings to gain more deflection or possibly mount the bracket upside down.
JD 
JC 
