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Buy 20x20x4 (19.5x19.5x3.75) Accumulair Diamond Filter MERV 13 | AirFilters.com
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6 Pack of 20x20x4 MERV 13 Pleated 4" Inch Air Filters by Glasfloss. Actual Size: 19-1/2 x 19-1/2 x 3-3/4 - Walmart.com
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Amazon.com: Aerostar 20x20x4 MERV 13 Pleated Replacement Air Filter for Honeywell FC100A1011, 2 Pack (Actual Size: 19 3/4" x 19 7/8" x 4 3/8") : Tools & Home Improvement
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Aerostar 20x20x4 MERV 13, Pleated Air Filter, 20 x 20 x 4, Box of 1, Made in the USA - Walmart.com
