16x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Lighting This carb source is as

This carb source is as unique as it is strong

Perfect for 1

When used in a hydroponic system

Continuously records data to the included microSD card every 5 seconds

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

16x20x4 (3 5/8) Pleated MERV 15 Air Filters 2 Pack Lighting This carb source is asImportant 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