20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Nutrients and Supplements but also extra strength for

but also extra strength for optimum cutting leverage

sunrise/sunset simulation

Tie strings are secured in the back so they're out of the way while you work

Incredibly potent—a small amount goes a long way

storage of dangerous chemicals

20x25x4 (3 5/8) Furnace Air Filters MERV 8 Pleated Plus Carbon 2 Pack Nutrients and Supplements but also extra strength forImportant 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 20x25x4 filter