20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack special-order Inner Dimensions: 3/16''

Inner Dimensions: 3/16''

Potassium and

While it perfectly matches the footprint and hanging height of legacy 1000W DE-HPS grow lights

PRO 315W CMH FIXTURE

20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack special-order Inner Dimensions: 3/16''Important 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