They were cheap. I figured if they're loud, I'm fine. These fans throw so much air around the edge. You can feel the backflow everywhere. I installed 4 fans for intake and one for exhaust. Exhaust fan appears to have no exhaust flow. I have vents for each fan. I understand they are cheap. But they literally mix the air in a circle and don't move anything. Oh, and they're really thick, a full inch thick, so it's very difficult to get them where you would expect them to be. Avoid this crap.
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