20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 8 Pleated Plus Carbon 2 Pack Hydro Systems B'Cuzz Hydro Nutrition A &

B'Cuzz Hydro Nutrition A & B must be mixed together in water simultaneously

Calcium also keeps nutrients moving throughout the plant

Corrosion and rust-resistant black zinc chromate plating

Ancient Amber was designed for all phases of plant growth and bloom

durable and easy to clean

20x20x5 (4 3/8) Honeywell/Lennox Replacement Furnace Filters MERV 8 Pleated Plus Carbon 2 Pack Hydro Systems B'Cuzz Hydro Nutrition A &Important 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. We also carry 4 7 8 and 5 1 4 inch depth filters,