20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 2 Pack Growing Accessories The Phantom Dual CMh High

The Phantom Dual CMh High Voltage System is a highly versatile fixture that allows you to run multiple ballast positions

This constant stimulation will quickly break down the nervous system of the insect and cause paralysis and death

Patented technology for nitrogen utilization and nutrient stabilization

The tailored spectral output promotes larger leaf area and thicker primary stems

What is air pruning and how does it help your garden

20x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filters 2 Pack Growing Accessories The Phantom Dual CMh HighImportant 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 20x20x4 filter