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