12x24x4 MERV 10 ( FPR 6-7 ) AC and Furnace Pleated 4" Inch Air Filters. Case of 6. Exact Size: 11-3/8 x 23-3/8 x 3-3/4"

16x25x4 MERV 10 ( FPR 6-7 ) AC and Furnace Pleated 4" Inch Air Filters. Case of 6. Exact Size: 15-1/2 x 24-1/2 x 3-3/4"

20x20x4 MERV 10 ( FPR 6-7 ) AC and Furnace Pleated 4" Inch Air Filters. Case of 6. Exact Size: 19-1/2 x 19-1/2 x 3-3/4"