Photo 1 of Aerostar 18x20x1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size: 17 1/2" x 19 1/2" x 3/4") Visit the Aerostar Store

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Photo 1 of Aerostar 18x20x1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size: 17 1/2" x 19 1/2" x 3/4") Visit the Aerostar StorePhoto 2 of Aerostar 18x20x1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size: 17 1/2" x 19 1/2" x 3/4") Visit the Aerostar StorePhoto 3 of Aerostar 18x20x1 MERV 13 Pleated Air Filter, AC Furnace Air Filter, 4 Pack (Actual Size: 17 1/2" x 19 1/2" x 3/4") Visit the Aerostar Store