I'm really impressed that such a tiny fan can blow THAT hard... although I didn't use it for it's intended purpose, so can't attest to how it would work spliced into a duct. I mounted two of them on the ceiling of my box truck toward the front of the box (blowing backward along the ceiling & out the back door) for ventilation on hot days, and in about 15-20 minutes it REALLY cools the box quite a bit... exhausting the hot air along the ceiling, and drawing in the cooler air along the floor. I'd definitely recommend this fan, especially for the walmart price you can't go wrong!
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