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Filtrete 10-in W x 20-in L x 1-in MERV 13 1900 MPR Premium Allergen, Bacteria and Virus Electrostatic Pleated Air Filter in the Air Filters department at Lowes.com
Amazon.com: Filtrete 10x20x1 Air Filter, MPR 1500, MERV 12, Healthy Living Ultra-Allergen 3-Month Pleated 1-Inch Air Filters, 6 Filters : Everything Else
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Filtrete 10x20x1 Air Filter, MPR 1200 MERV 11, Allergen Plus Odor Reduction, 1 Filter - Walmart.com
Filtrete 10x20x1 Air Filter MPR 300 MERV 5 Clean Living Basic Dust, 6 Pack | eBay