That, My friend is the amazing invention of Mr. Mildwurf Flump in 1979. It converts co and other greenhouse gasses to pure o2. In 1980 almost every split coil was shipped with this amazing product, i't didn't work. Manufactrures removed the wonder fabric and found it good for shipping packing, apparently that unit was assembled on a early Monday morning or late Friday afternoon. Incidentily, Mr. Flump has since left inventing and has moved on to desighning equipment with non acessable controls-motors-belts,etc. His newest idea is a welded box with a pad on the side that you bang you'r head on and chant "ooom" while the customer is at the bottom of the ladder chewing you'r pants leg.