20x20x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack Emitters Trellis expands to over 4

Trellis expands to over 4 feet tall and snaps together

84 x PotPro™ | Link x 1ft (unit)

CO2 Sensor Type:                               NDIR (Nondispersive Infrared)

or indoor potting soil media

OAKTON's new EcoTestr is economical and easy to use

20x20x4 (3 5/8) Pleated MERV 15 Air Filters 1 Pack Emitters Trellis expands to over 4Important 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 20x20x4 filter