20 in x 25 in x 6 in Synthetic Furnace Air Cleaner Filter, MERV 11 2 PK, Bestair Pro, Mfr#: A201-SGM-BOX-11R$47.19+
16 in x 20 in x 5 in Synthetic Furnace Air Cleaner Filter, MERV 11 2 PK, Bestair Pro, Mfr#: 5-1620-11-2$39.15+
20 in x 20 in x 5 in Synthetic Furnace Air Cleaner Filter, MERV 11 2 PK, Bestair Pro, Mfr#: 5-2020-11-2$40.69+
20 in x 25 in x 5 in Synthetic Furnace Air Cleaner Filter, MERV 11 2 PK, Bestair Pro, Mfr#: AB-52025-11-2$54.65+