Originally Posted by LyveWRX
I'd guess that a intake engine air filter would be at least HEPA quality. (99.97% of all particles >.3um (first pass efficiency)) The problem is that if the Max CFM at the pressure that the blower motor produces (prob not > 12"H2O) is too low there is a chance of not cooling the blower motor properly.
no way imho! have you looked at engine filters? they are nothing like HEPA filters, atleast in order of filtration. you can see through them ! (not really, but you get the idea).