16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 1 Pack aaron The extended root system resulting

The extended root system resulting from the symbiotic relationship allows to enhance water and nutrient uptake

and soilless applications

precise cut accompanied by a razor sharp edge that is perfect for harvesting undamaged buds and trichomes

Chinch Bugs (3 different species within the Lygaeidae family)

16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 1 Pack aaron The extended root system resultingImportant 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