20x25x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack led Packed full of features to

Packed full of features to keep your grow room and your light bill at its best

Derived From: Naturally occurring

• Dolomitic and Calcitic limestone (pH adjuster)

Conductivity Resolution: 10 uS

20x25x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack led Packed full of features toImportant 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