Photo 1 of Aerostar 20x20x4 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x19 1/2"x3 3/4") 20x20x4 Air Filter

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Photo 1 of Aerostar 20x20x4 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x19 1/2"x3 3/4") 20x20x4 Air FilterPhoto 2 of Aerostar 20x20x4 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x19 1/2"x3 3/4") 20x20x4 Air FilterPhoto 3 of Aerostar 20x20x4 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 6 Pack (Actual Size: 19 1/2"x19 1/2"x3 3/4") 20x20x4 Air Filter