The apparatus 1 further comprising an outlet filter immediately before the outlet for purified air to remove a majority of particles in {HEAD ~ the air stream} of {TAIL ~ the apparatus} 
of
The apparatus 1 further comprising an outlet filter immediately before the outlet for purified air to remove a majority of particles in { HEAD ~ the air stream } of { TAIL ~ the apparatus }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL