20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 1 Pack lighting-&-electrical-components Nitrogen is critical for forming

Nitrogen is critical for forming vegetative matter and supporting abundant growth

We use only premium ingredients for the healthiest plants possible

Bacterial leaf blights

Minimizes the effects of transplanting shock and other related stress conditions

easy-to-hold grip of floral snips

20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 1 Pack lighting-&-electrical-components Nitrogen is critical for formingImportant 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