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Filtrete 18-in W x 24-in L x 1-in MERV 11 1085 MPR Allergen Defense Extra Electrostatic Pleated Air Filter (2-Pack) in the Air Filters department at Lowes.com
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Filtrete 18x24x1 Air Filter, MPR 1000, MERV 11, Micro Allergen Defense 3-Month Pleated 1-Inch Air Filters, 2 Filters - Amazon.com
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4QualityAir.com - 18 x 24 x 5 (17.75 x 23.75 x 4.38) MERV 13 Replacement Aftermarket Grille Filter for Honeywell 2-Pack
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HDX 18 in. x 24 in. x 1 in. Standard Pleated Air Filter FPR 5, MERV 8 HDX1P5-011824 - The Home Depot
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PRO-SOURCE - Pleated Air Filter: 18 x 24 x 1″, MERV 8, 35% Efficiency, Wire-Backed Pleated - 03314150 - MSC Industrial Supply
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