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