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18" x 21" x 1" MERV 8 Air Filters - Only $16.59/ea.
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Filtrete 18-in W x 20-in L x 1-in 5 MERV Basic Pleated Air Filter in the Air Filters department at Lowes.com
Amazon.com: Filterbuy 18x20x1 Air Filter MERV 8 Dust Defense (4-Pack), Pleated HVAC AC Furnace Air Filters Replacement (Actual Size: 17.50 x 19.50 x 0.75 Inches) : Tools & Home Improvement
Airteva AC, Furnace Filter With (1) Biosponge Plus Replacement Pad (18 X 20 x 1)Actual Size: 17 3/4 x 19 3/4 x 3/4" - Walmart.com
Filterbuy Merv 8 Silver Furnace Filter NEW 2 Pack - 18 x 20 x 1 - MADE IN USA | eBay
AAF/Flanders 84858011820 18" x 20" x 1" NaturalAire Furnace Air Filter | Highway To Buy
25" X 25" X 1" Fiberglass Media Furnace Air Filter - No. 10055.012525 - Whitehead Industrial Hardware
Do it Best 18 In. x 30 In. x 1 In. Dust & Lint MERV 6 Furnace Filter - Alamo Lumber
18 x 20 x 1 Merv 11 Furnace Filter 12 Pack - Replacement Furnace Filters - Amazon.com
12 Pack of 18 x 20 x 1 Merv 10 Pleated Air Filters for AC & Furnace - Walmart.com
Filterbuy 18x20x1 Air Filter MERV 8 Odor Eliminator, Pleated HVAC AC Furnace Filters Replacement | Wayfair
12 Pack of 18 x 20 x 1 Merv 10 Pleated Air Filters for AC & Furnace - Walmart.com
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Nordic Pure 18x20x1 MERV 13 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com
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Nordic Pure 18x20x1 MERV 8 Pleated AC Furnace Air Filters 6 Pack - Replacement Furnace Filters - Amazon.com
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HDX 18 in. x 20 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-011820 - The Home Depot
Filtrete 18-in W x 20-in L x 1-in 5 MERV Basic Pleated Air Filter in the Air Filters department at Lowes.com
Nordic Pure 18x28x1ExactCustomM8-6 Exact MERV 8 AC Furnace Filters - 18 x 28 x 1 in., Pack of 6 - Walmart.com
