16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack coco-cubes No other enzyme cleansing product

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

which hatch when the weather becomes warm

65-70% relative humidity

CNC-machined rounding and chamfering on all corners and edges for a high-end look

This adjustable timer protects the HID lights which need to cool down before to restart to avoid prematurely burning the bulbs

16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack coco-cubes No other enzyme cleansing productImportant 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