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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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BNX TruFilter 20x20x4 (19 1/2'' X 19 1/2'' X 3 5/8'') MERV 13 Air Filter | eBay
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Amazon.com: PureFlow Home Air Filter MERV 13, 20x20x4 Furnace Filter, 4 Layer High Efficiency Filtration for Dust, Smoke, Fumes, Pollutants (Pack-of-1) : Tools & Home Improvement
Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) - Replacement Furnace Filters - Amazon.com
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Filterbuy 20x20x4 Air Filter MERV 13 Optimal Defense (6-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 19.38 x 19.38 x 3.63 Inches) - Replacement Furnace Filters - Amazon.com
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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20x20x4 MERV 13 Pleated Air Filter 3PK | 19.5x19.5x3.625 - Actual Size - Walmart.com
