Why should it be pointed up at the ceiling?  I saw a study that said pointed down is better.

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    Why should it be pointed up at the ceiling?  I saw a study that said pointed down is better.

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    That study did not include the risk of reaersolization (blow back up in the air)  of dried respiratory aerosols that will have settled on the ground.   You will give a little in efficiency to gain safety.

    http://poppendieck.com/IAQ/COVID19%20FAQ.html

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