20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack drying-racks EC-to-TDS Conversion Factor: NaCl (avg

EC-to-TDS Conversion Factor: NaCl (avg of 0

enhanced crop quality and increased yields

The end result

the light is dimmable by knob manual dimmer or RJ11 connection for massive control opperation

We recommend that you change your air filter every 3-6 months to maintain maximum efficiency and economy

20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack drying-racks EC-to-TDS Conversion Factor: NaCl (avgImportant 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 20x25x4 filter