20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack micro-nutrients simple pH calibration with on

simple pH calibration with on screen instructions

factory-installed 120V power cord

have developed the first line of Natural Quartz

This allows for a reliable power supply at a competitive cost

The Max-Fan™ is an inline mixed flow fan capable of medium to high static pressure

20x25x4 (3 5/8) Pleated Air Filters MERV 15 Plus Carbon 2 Pack micro-nutrients simple pH calibration with onImportant 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