16x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 2 Pack Hydroponics 2 μmol/J (PhysioSpec Indoor

2 μmol/J (PhysioSpec Indoor

including azadirachtin

With its rapid heat-up time

Premium DE lamp features:

Nordic Pure 12x24x4 MERV 10 Pleated Plus Carbon air filters are made of a dual material where the MERV rated material has been fused together with a carbon layer

16x20x4 (3 5/8) Pleated Air Filters MERV 13 Plus Carbon 2 Pack Hydroponics 2 μmol/J (PhysioSpec IndoorImportant 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