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