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DuPont Advanced Allergen 8500 Merv 11 Furnace Air Filters $4.99 after sale and rebate various sizes B&M
DuPont 3 Way Odor Control Carbon Adjustable Air Filter 20"x25". This filter is unique in that can be trimmed to fit most HVAC size needs. - Walmart.com
16x25x4.375 MERV 13 Honeywell 5 Pack Air Filters for HVAC
12x24x1 DuPont High Allergen Care Electrostatic Air Filter (12 Pack) | eBay