20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 1 Pack lighting-&-electrical-components • No circling roots

• No circling roots

3/8" FPT inlet and MPT outlet

Nitrogen is critical for forming vegetative matter and supporting abundant growth

Minimizes the effects of transplanting shock and other related stress conditions

20x20x4 (3 5/8) Pleated Air Filters MERV 7 Plus Carbon 1 Pack lighting-&-electrical-components • No circling rootsImportant 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