16x20x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack Controllers Simply submerge the tip of

Simply submerge the tip of the specially designed electrode into soil

filters and ducting

and aeration in a consistent growing medium such as: mycorrhizal fungi

fear no more

This component ensures a perfect cut and optimal results for wet and dry product

16x20x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack Controllers Simply submerge the tip ofImportant 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