20x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack rock-bottom with driver and suspending accessories

with driver and suspending accessories

increasing the rate of chemical reactions which facilitate plant growth

too much will cause root rot and plants will suffer

integrated production and world-class R&D

20x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack rock-bottom with driver and suspending accessoriesImportant Note: Almost ALL furnace filters have a different "actual size" than the nominal size printed on the air conditioner filter. It's best if you measure your air filter for the EXACT size and compare it to our "Actual Size" and then you can be sure your A C air filter fits! With the 4" and 5" air filters there is a wider variance between the nominal and actual size depending on the manufacturer. If you are replacing a 4 3 8 depth 20x20x4 filter