I bought one, and liked it so much, I bought 2 more 2 weeks later. Within 2-3 weeks, whenever you even gently touched them or tried to change their speeds, they started making this high speed whirling noise and stopped moving air. At first, you could turn them off, then they would work normally again until you touched them. Then back to the whirling noise with no air movement. After a few times of this, they stopped moving air altogether. After reading many of the reviews, this is a common problem. If the vendor wants to send me three more fans to re-try, I would gladly change my review if they worked. Otherwise, stay away from this fan, there are so many more out there with great reviews.
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