HEPA= densely packed with paper
and the pre motor filter is foam as Madrat mentioned
I thought you could get HEPA pre-motor filters on some vaccums
There's no point in the pre filter being a HEPA as the HEPA is designed to capture miscoscopic particles for cleaner air. The motor produces carbon dust so it makes more sense for the HEPA to be after the motor rather than as a pre filter.
After so many quotes
[/quote]
Oh Ok- That makes sence now