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Fan Size - 4 Inch
and 55 gallon drums
always confirm compatibility with a jar test and apply to a small section of the crop before mixing and applying large volumes
The control includes an on/off switch and up/down buttons
16x20x4 (3 5/8) Pleated MERV 12 Air Filters 1 Pack CO2 Fan Size - 4 InchImportant 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
