Filters-NOW DPFU21X21X5M8 21x21x4.5 - 20.75x20.75x4.38 MERV 8 Rheem Replacement Filter Pack of - 2

This Whole-House Media Air cleaner was designed to fit Rheem central heating systems. Nominal Size 21 x 21 x 4 1/2 (Actual Size 20 3/4 x 20 3/4 x 4 3/8 ) Traps filters & reduces major pollutants such as dust and pollen from the air passing through your heating and cooling systems. Deep-pleat Filters perfectly fit the media cabinet. Surface area is maximized allowing filters to last up to one year reducing replacement changes. Lasts up to 6 Months- SKU: FLTN12111