This disposable deep pleated air filter cartridge is specially designed to work in a Air Bear whole-house air cleaner. The filtering medium is made with a blend of polypropylene and polyethylene electrostatic filtering fibers. The medium is adhered to an expanded metal backing, deep pleated and encased in a moisture resistant kraft board frame. It offers a MERV 8 level of performance. (This product is manufactured by Flanders Precisionaire. Honeywell is a registered trademark of Honeywell Inc. Reference to their mark here is for system identification only.)