16x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack bio soil or PINK spectrum LED grow

or PINK spectrum LED grow lights

If the rejection % falls under an acceptable level (typically 90%) it’s time to change the membrane

soft and hard shell bags

extract its food value and expel the residue as worm castings

16x20x4 (3 5/8) Pleated MERV 14 Air Filters 6 Pack bio soil or PINK spectrum LED growImportant 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