20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack reflectors and grow lights Use Ancient Amber in soil

Use Ancient Amber in soil or hydroponics with any nutrient line

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

Rated at 40

California Laurel Aphid (Euthoracaphis umbellulariae)

potassium sulfate

20x20x4 (3 5/8) Pleated MERV 8 Air Filters 6 Pack reflectors and grow lights Use Ancient Amber in soilImportant 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