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HDX 21 in. x 21 in. x 1 in. Standard Pleated Air Filter FPR 5, MERV 8 HDX1P5-012121 - The Home Depot
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Filtrete 21-in W x 21-in L x 1-in MERV 12 1500 MPR Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com
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Koch Air Filter 19 7/8 x 21 1/2 x 1 MERV 8 Pleated Air Filter 12 Pack - Hepa Filter Sales - HepaFilterSales.com -- We Deliver Breathing Easier
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Aerostar 21 1/2x21 1/2x1 MERV 11 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 21 1/2" x 21 1/2" x 3/4") - Amazon.com
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Filtrete 21-in W x 21-in L x 1-in MERV 5 Basic Pleated Air Filter in the Air Filters department at Lowes.com
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