- This is a progressive density, adhesive coated synthetic fiber air filter with a reinforcing scrim on the air exiting side. This panel filter is designed to meet the most stringent efficiency and particle migration tests to ensure air free of finish damaging dust. Ideal for upgrading a crossdraft spray booth to downdraft quality air. The self-sealing gasket and internal wire frame eliminate by-pass and flutter to keep dirt out of the spray booth. Fits frames fast without adaptors or sharp edges for reduced labor costs.