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Activated Carbon Air Filters: True MERV 8 filtration with activated carbon to control odors. Bag packed. Actual size is 19-15/8" x 21-3/4" x 3/4"NaturalAire® Air Filters: These pleated filters are MERV 8 rated, individually wrapped, made to fit an opening 20" x 22" x 1" and will capture visible dust.. THESE FILTERS ARE MADE TO ORDER AND CANNOT BE RETURNED. See Product Image Pre-Pleat 40 Air Filters: These 20"x22"x1" pleated filters are rated MERV8 and will capture visible dust. These are heavy-duty, commercial-grade pleated filters with actual dimensions of 19-5/8" x 21-3/4" x 3/4".See Product Image
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