The Flanders NaturalAire standard MERV 8 is made of a one-sided metal-reinforced pleated media. This filter tests as a MERV 8 rating through ASHRAE 52.2 testing methods. Housed in a 1 inch recyclable clay-coated moisture resistant frame, the NaturalAire MERV 8 uses a mechanical media that maintains the minimum listed efficiency through the life of the filter. This filter captures particles as small as 1 microns and is effective against the following contaminants pet dander, mold spores, dust mite debris, pollen, household dust, as well as debris and lint.