Very quiet fan
This is a very quiet fan and I could not hear its noise when I hold it 2 ft away from my ears. It can be used to blow air in/out the computer case by facing the label side of the fan inward/outward. Because my power fan and CPU fan are much louder than this fan, I will perhaps not hear the difference by using a noisier fan. There is no way to tell how the variable speed works. I assume that it is more efficient than a fan with fixed speed.
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