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Old 03-11-2015, 10:35 AM   #44
Qmulus
inveniam viam aut faciam
 
Join Date: Mar 2014
Location: Arvada, CO
Posts: 441
FWIW, here is a good study of air filters. I like tests with real data and there is a lot there. Bottom line, there is no free lunch. Interesting read if nothing else...
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