Flanders Permaire Media Rolls Service Roll, Up to MERV 4 20 in. W x 30 ft. H x 1 in. D

Durable synthetic, self-supporting media rollInnovative replacement media offers longer service life and better structural integrity with no frame requiredReplaces any size furnace filterUp to MERV 4 rating: Efficient removal of Dust, Lint, and PollenWashable and reusableEasy to cut-to-sizeAvailable in ½”, 1”, and 2” media thicknessLasts up to 30 days Permaire Media Rolls are naturally rigid. Once cut to the proper dimensions, they are complete filters ready to install, no frame required. As dust particles pass through the filtration media, they become naturally charged and are attracted to the opposite charge on the filter fibers. Dust, lint, and pollen collect throughout the filter's depth, allowing it to hold more contaminants for fewer filter changes with improved air quality.