{HEAD ~ The room filter apparatus} 16 wherein {TAIL ~ said first sheet} of said woven polypropylene has heat sealed finished edges such that said filter material can support its own weight within said filter frame 
wherein
{ HEAD ~ The room filter apparatus } 16 wherein { TAIL ~ said first sheet } of said woven polypropylene has heat sealed finished edges such that said filter material can support its own weight within said filter frame
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD 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 OTH OTH OTH