20x25x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 1 Pack Water Treatment due to its optimized nutrient

due to its optimized nutrient profile

No-Hassle Drainage – The positive pressure drain removes the need for a drain trap

High product quality

Chironomus plumosus

1000W - Halide 250W

20x25x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 1 Pack Water Treatment due to its optimized nutrientImportant 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