20x20x4 (3 5/8) Pleated MERV 12 Air Filters 2 Pack control system Big Rootz is carefully formulated

Big Rootz is carefully formulated to meet the needs of professional growers

resulting in a more bountiful harvest and improved aroma

simply press the handles together to open automatically

Active tip probe length 50 mm/2''

20x20x4 (3 5/8) Pleated MERV 12 Air Filters 2 Pack control system Big Rootz is carefully formulatedImportant 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