16x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack spl_hlg Natural fertilizer

Natural fertilizer

ZeroTol is a powerful tool to contain pathogens and stop the spread of diseases in your grow

Coconut Coir: a natural water-holding ingredient providing on-demand moisture

and it's non-toxic and biodegradable

16x20x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 1 Pack spl_hlg Natural fertilizerImportant 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