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- $55.972-Pack Air Filter Factory Replacement For Aprilaire Space-Guard 401, 2400, SG4PR-2 Accordion Style Furnace Air FiltersAmazon
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- $48.50Filtrete 20x25x1 AC Furnace Air Filter, MERV 8, MPR 700, Tough on Pollen, Easy on Airflow, 3-Month Pleated 1-Inch Electrostatic Air Cleaning Filter, 4-Pack (Actual Size 19.880 x 25.563 x 0.8125 in )Amazon
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- $12.9624 in. x 24 in. x 1 in. Standard Pleated Furnace Air Filter FPR 5, MERV 8 (3-Pack)The Home Depot
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