16x20x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack growing-accessories providing years of trouble-free operation

providing years of trouble-free operation

By flushing your crops

and even then it probably won’t sting

from cloning to blooming

16x20x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack growing-accessories providing years of trouble-free operationImportant 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 16x20x4 filter