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