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18x24x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack - Walmart.com
18x24x4 MERV 10 AC & Furnace 4" Depth Air Filters. Box of 4. Actual Size: 17-1/2 x 23-1/2 x 3-3/4 - Amazon.com
