16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack BVV It will help protect beneficial

It will help protect beneficial bacteria to invigorate organic compost

1/2" grommet

for maximum portability and ease of use

HPCC BIOFUNGICIDE + MYCORRHIZAE – high porosity

lush white root development and will maximize your germination and cloning success rate for up to 14 seeds or clones

16x20x4 (3 5/8) Pure Carbon Pleated Odor Reduction Merv 8 Furnace Filter 1 Pack BVV It will help protect beneficialImportant 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