{TAIL ~ The room filter apparatus} 16 wherein {HEAD ~ 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 
{ TAIL ~ The room filter apparatus } 16 wherein { HEAD ~ 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
TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH