Date:   7/28/2011 12:48:39 PM ( 13 y ago)
Hits:   2,214
URL:   https://www.curezone.org/forums/fm.asp?i=1840020

Hepa filters require a lot of air movement to work. So you'll need a fan to pull that air through. Usually the fan is placed on the inside and draws/sucks air through the filter. If the fan is on the outside the blades get dirty. I heard you need about 200 cfm air movement in the fans to push the air through the rather dense Hepa filter.
 

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