20x25x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack Lighting Accessories • Each controller unit can

• Each controller unit can control up to 24 of our 5-gallon growing modules

phosphate and calcium

Lead to higher yields

During the lights on cycle

Rubber gasket to ensure air tight fitting

20x25x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack Lighting Accessories • Each controller unit canImportant 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 20x25x4 filter