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HDX 18 in. x 18 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack) HDX3P5-011818 - The Home Depot
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Amazon.com: Air Filter 18x18x1, TRIGHTFILTERS MERV 8 Pleated HVAC AC Furnace Filters, 6-Pack Furnace Air Filter for Vent, Air Conditioner, Cleaner Machine, MPR 600 : Tools & Home Improvement
