16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack coco-cubes which hatch when the weather

which hatch when the weather becomes warm

Reliable Passive Cooled Design

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

Ensures the safest water

non-burning

16x20x4 (3 5/8) Furnace Air Filters MERV 12 Pleated Plus Carbon 6 Pack coco-cubes which hatch when the weatherImportant 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