16x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack HPS Protects Beneficial Bacteria: Ideal for

Protects Beneficial Bacteria: Ideal for organic compost

Though new to growers

Highly effective in nutrient-deficient soils and for container or hydroponic plants

- Grey 12gal - 15inW x 15

16x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack HPS Protects Beneficial Bacteria: Ideal forImportant 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