I got this fan for my travel trailer since it would run off a 12 volt socket. 1st issue was it was all I could do to get the thing plugged in. Either my socket was undersized or the plug on the fan was oversized, it was all I could do to get the thing pushed in far enough without breaking something. When I finally got it in far enough to power the fan, imagine my surprise when the fan blade rubbed on the fan housing as it was spinning , which caused a lot of noise. I promptly returned the fan.  I gave a second star for the ease of returning an Amazon product...otherwise it would have been just one.