20x20x4 (3 5/8) Pleated MERV 10 Air Filters 1 Pack CO2 Trim straight into these bad

Trim straight into these bad boys

Inoculate seedlings and established vegetative plants with the highest CFU’s on the market

Signal Strength

Flower wellness not only brings customer satisfaction but repeat business

Includes raised platform insert and capillary matting allowing plants to self water for up to 14 days (subject to climate conditions)

20x20x4 (3 5/8) Pleated MERV 10 Air Filters 1 Pack CO2 Trim straight into these badImportant 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