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K&N 24-in W x 24-in L x 1-in Washable 11 MERV Pleated Air Filter in the Air Filters department at Lowes.com
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Amazon.com: Filterbuy 24x24x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 23.38 x 23.38 x 0.75 Inches) : Tools & Home Improvement
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AAF Flanders 24 x 24 x 2 Pre-Pleat 40 Pleated MERV 8 air filter; (12-Pack) 80055.022424 - The Home Depot
24 in x 24 in x 11 1/2 in Actual Filter Size, 1,200 cfm Air Flow @ 300 fpm, HEPA Air Filter - 6B614|6B614 - Grainger
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Truaire 190RF 24X24 Stamped Return Air Filter Grille, Removable Face, 24" X 24", White, 27 " x 1.75 " x 27": Amazon.com: Tools & Home Improvement
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