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PRO-SOURCE - Pleated Air Filter: 18 x 18 x 1″, MERV 10, 55% Efficiency, Wire-Backed Pleated - 00027441 - MSC Industrial Supply
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Filtrete 18-in W x 18-in L x 1-in MERV 5 Basic Pleated Air Filter (3-Pack) in the Air Filters department at Lowes.com
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Filtrete 18x18x1 Air Filter, MPR 1000, MERV 11, Micro Allergen Defense 3-Month Pleated 1-Inch Air Filters, 4 Filters - Replacement Furnace Filters - Amazon.com
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