Review on Wathai 40x40x20mm 40mm 12V 2Pin DC Brushless Cooling Fan: Efficient Cooling Solution for Electronics by Cornelius Mosley

This fan is noisy but I have ordered 2 more from other sellers and they are all noisy. This is a fan for my security recorder. I've found that QUIET fans don't move much air at all. I actually bought and tested a new DVR, it is very quiet but there is very little air movement which could explain the premature failure of the HD in mine. I think I'll live with the noise and extend the life of the HD.