20x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack grow-light-ballasts Our carbon beds feature an

Our carbon beds feature an overall set width to maximize the efficiency of the granular carbon

This is the Best Hydroponic Bucket System on the market

Magnetic 100W MH

Will not harm beneficials or pollinators

20x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack grow-light-ballasts Our carbon beds feature anImportant 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