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In my office, there is a ceiling vent for the air heat/conditioning, where the main blower is on the roof right above, and all that heat pours out into my desk area, leaving my space filled with roaring fan noise and 80 degrees temp. One baffle hanging in front of that vent has reduced the noise considerably (it doesn't bother my concentration anymore) and seems to block/push the air the other way reducing temp a little.
-B. Connor
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