20x25x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 2 Pack dis This sensor provides a rapid

This sensor provides a rapid response and high accuracy pH measurements for industrial applications

Contains three dual-ball bearing fans with PWM-controlled motors to minimize noise

clean air in your home or office

Runs on a 400W HPS ballast

20x25x4 (3 5/8) Pleated Air Filters MERV 14 Plus Carbon 2 Pack dis This sensor provides a rapidImportant 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