16x20x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack CO2 always confirm compatibility with a

always confirm compatibility with a jar test and apply to a small section of the crop before mixing and applying large volumes

Model number nomenclature is further specified as follows: 5XY: X = 1 (120 Volts) or 2 (230 Volts) Y = E (E-tubes) or F (F-tubes) For example

The control includes an on/off switch and up/down buttons

Fan Size - 4 Inch

and 55 gallon drums

16x20x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack CO2 always confirm compatibility with aImportant 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