16x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Lighting Negative pressure means molecules in

Negative pressure means molecules in the air are pulled toward the center of the room and toward a controlled disinfection point

Adapter collar to increase pH probe thread to 1' NPT

±(50ppm + 3%MV)

Simply attach the tumbler and brush bar to the mounting points

Continuously records data to the included microSD card every 5 seconds

16x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Lighting Negative pressure means molecules inImportant 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