Low density, reticulated filter foam stripping is a flexible, porous polyurethane ether foam with unique filtering abilities. 20PPI foam is a permeable reticulated foam ideal for filtration applications. Reticulated filter foam is flexible and soft for sewing, taping, gluing and grommeting applications. Save on volume purchases of 10 foot rolls packaged 4 rolls to a carton. Typical application include sill baffles and weep holes, filter foam, air conditioners, furnaces, engines, scrubber pads and sound attenuators.