16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack coco-cubes Reliable Passive Cooled Design

Reliable Passive Cooled Design

critical environments

V9D 9 CFM Two Stage Vacuum Pump

65-70% relative humidity

No other enzyme cleansing product on the face of the earth can compete with Z7 when comparing cost savings for growers and plant growth performance

16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack coco-cubes Reliable Passive Cooled DesignImportant 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