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Filtrete 16-in W x 20-in L x 1-in MERV 1 Basic Flat Air Filter (2-Pack) in the Air Filters department at Lowes.com
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16x20x1 Glasfloss Fiberglass Air Filter, Double Strut, GDS Series, Made in USA, Actual Size: 15 5/8 x 19 5/8 x 3/4 (Box of 6) - Amazon.com
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