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Filtrete 20x25x4, AC Furnace Air Filter, MPR 1550 DP, Healthy Living Ultra Allergen Deep Pleat, 2-Pack, Fits Lennox & Honeywell Devices exact dimensions 19.88 x 24.63 x 4.31 - Walmart.com
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hvac - Where should my furnace filter go in a Lennox G40UHX series furnace? - Home Improvement Stack Exchange
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