16x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack controllers Root Royale Cocopure and Cocolite

Root Royale Cocopure and Cocolite are RHP certified and have very low EC values

and the rubber feet minimize vibration and hum as they protect the surface the ballast sits on

bat guano and kelp meal

Available Phosphate (P2O5) 1

The Max-Fan® Pro Series is even more efficient and stronger than the original Max-Fan® design

16x20x4 (3 5/8) Pleated MERV 7 Air Filters 6 Pack controllers Root Royale Cocopure and CocoliteImportant 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