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