20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack reflectors and grow lights Evaporation from the tray on

Evaporation from the tray on hot days helps prevent leaf scorch in the same way a gravel tray would

while allowing the stems of your cuttings to be completely unrestricted to the inside of the misting chamber

OMRI listed and NOP approved

Rated at 40

20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack reflectors and grow lights Evaporation from the tray onImportant 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