The Flanders NaturalAire Standard Air Filter is made of a one-sided metal-reinforced pleated media. This filter tests as a MERV (Minimum Efficiency Reporting Value) 8 rating through ASHRAE 52.2 testing methods. Housed in a recyclable clay-coated moisture resistant frame, the NaturalAire MERV 8 Air Filter uses a mechanical media that maintains the minimum listed efficiency through the 90-day service 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.

This is for all 4 filters, which is enough for one year of clean air.