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12x20x1 Naturalaire MERV 8 (12 Filters) 84858.011220
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The Naturalaire Standard MERV 8. The Naturalaire Standard has an ASHRAE 52.2 rating of MERV 8. This filter is convenient to use and easy to replace. Ordinary furnace filters are designed to protect heating and cooling equipment from the insulating properties of relatively large airborne particles. The NaturalAire Standard goes far beyond that, removing even those microscopic particles that can stain walls and furnishings, or worse aggravate seasonal allergies.