Home Improvement: Nordic Pure 18x20x1M8-6 MERV 8 Pleated AC Furnace Air Filter, 18x20x1, Box of 6 - Nordic Pure

Home Improvement: Flanders 10155.01182 E-Z Flow Air Filter, MERV 4, 18 x 20 x 1-Inch, 12-Pack - Flanders Corporation

Home Improvement: Filtrete MPR 1000 18 x 20 x 1 Micro Allergen Defense AC Furnace Air Filter, Guaranteed Airflow up to 90 days, 4-Pack - Filtrete

Home Improvement: AIRx ALLERGY 18x20x1 MERV 11 Pleated Air Filter - Made in the USA - Box of 6 - AiRx

Home Improvement: FilterBuy AFB MERV 8 18x20x1 Pleated AC Furnace Air Filter, (Pack of 4 Filters), 18x20x1 - Silver - FilterBuy

Home Improvement: FilterBuy Allergen Odor Eliminator 18x20x1 MERV 8 Pleated AC Furnace Air Filter with Activated Carbon - Pack of 2 - 18x20x1 - FilterBuy

Home Improvement: AIRx HEALTH 18x20x1 MERV 13 Pleated Air Filter - Made in the USA - Box of 6 - AiRx

Kitchen: 18x20x1 MERV 8 Pleated AC Furnace Air Filters. 4 PACK - Clarcor / Johnson Controls

Home Improvement: AIRx DUST 18x20x1 MERV 8 Pleated Air Filter - Made in the USA - Box of 6 - AiRx

Home Improvement: Nordic Pure 18x20x1 MERV 10 Pleated AC Furnace Air Filter, Box of 6 - Nordic Pure

Home Improvement: E-Z Flow Heavy Duty Air Filter, MERV 4, 18 x 20 x 1-Inch, 12-Pack - Flanders Corporation

Home Improvement: 18x20x1 (17.75x19.75) MERV 8 Air Filter/Furnace Filters (4 pack) - Filters-NOW

Home Improvement: 18x20x1 (17.75x19.75) MERV 8 Air Filter/Furnace Filters (6 pack) - Filters-NOW

Home Improvement: AFB Silver MERV 8 18x20x1 Pleated AC Furnace Air Filter. Pack of 2 Filters. 100% produced in the USA. - FilterBuy

Home Improvement: 18x20x1 Ultra Allergen Merv 11 Pleated Replacement AC Furnace Air Filter (6 Pack) - Tier1

Home Improvement: Nordic Pure 18x20x1M7-6 MERV 7 Pleated AC Furnace Air Filter, 18x20x1, Box of 6 - Nordic Pure

Home Improvement: Nordic Pure 18x20x1M12-6 Replacement Furnace Filters - Nordic Pure

BISS Basic: Aerostar Pleated Air Filter, MERV 8, 18x20x1, Pack of 6, Made in the USA - Filtration Group (Environmental Air)

Home Improvement: NaturalAire Standard Air Filter, MERV 8, 18 x 20, 1-inch, 12-Pack - Flanders Corporation

Kitchen: 18x20x1, Percisionaire Ez Flow Ii Front Panel Merv 4, 10055.011820, Pack12 - Flanders

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