16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 2 Pack Growing Accessories 13-inch overall length

13-inch overall length

For a limited time

Tarnished Plant Bug)

Fold these up and make a quick rosin bag

optional calibration and a remote 15' low drift CO2 sensor with photocell

16x20x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 2 Pack Growing Accessories 13-inch overall lengthImportant 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