The Flanders Pinch Pleat is made of a one-sided metal-reinforced Pleated media. This filter tests as a MERV 6 rating through ASHRAE 52.2 testing methods. Housed in a 1″ recyclable chipboard frame, the Pinch Pleat is made of an efficient synthetic media. This filter captures particles as small as 3 microns and is effective against the following contaminants; mold spores, dust mite debris, pollen, household dust, as well as debris and lint.