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Pack of 12 disposable UL Class II rated air filters designed for protection of furnace and central air units;MERV 4 rating: Removes household dust, pollen, and lint;Continuous chipboard design guards against corner separation while the one-sided metal media retainer adds to the filter strength;Each filter maintains efficiency for up to 30 days;Compatible with HVAC systems requiring filters sized 10 x 20 x 1

E-Z Flow Air Filter MERV 4 10 x 20 x 1-Inch by Flanders - B01N5GMXPJ