HEPA filters can remove at least 99.97% of airborne particles 0.3 micrometers (µm) in diameter. Particles of this size are the most difficult to filter and are thus considered the most penetrating particle size (MPPS). Particles that are larger or smaller are filtered with even higher efficiency.
http://en.wikipedia.org/wiki/HEPA
Why don't you have any sound in your video?
jaworskij 2 years ago
SEARS in the U.S.
louisodavid 3 years ago
where do you get one?
Niggajaybrezzy 4 years ago