16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack Pots and Containers and mushroom houses

and mushroom houses

19 x PotPro™ | Link x 2ft (unit)

At the heart of both these systems is the new and improved PHB4030 Phantom Commercial DE Ballast with USB Interface

soilless and soil-based media

Available in 4x4 and 4x8

16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack Pots and Containers and mushroom housesImportant 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