16x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack Grow Strong the Plasma Air 50 Series

the Plasma Air 50 Series Industrial Ionizer delivers a proven

One simple controller to manage ALL of your indoor garden's climate parameters

outdoor and container gardens

Verticillium sp and White Mold

plant root dip

16x20x4 (3 5/8) Furnace Air Filters MERV 10 Pleated Plus Carbon 6 Pack Grow Strong the Plasma Air 50 SeriesImportant 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