20x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack AIR FILTER BOXES Daisy chainable—run 4 fixtures from

Daisy chainable—run 4 fixtures from a single outlet

and create greater yields

and upon transplanting

Includes: CO2 Generator

20x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack AIR FILTER BOXES Daisy chainable—run 4 fixtures fromImportant 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