20x25x4 (3 5/8) Pleated MERV 12 Air Filters 6 Pack Controllers • Adjustable Speed Control (1-20

• Adjustable Speed Control (1-20 RPM)

You can daisy-chain up to 4 of these units to the MTMDU unit to maximize your seed starting area

Anodized aluminum construction with CNC-machined detailing for a professional appearance

Operating Time Monitor: Accumulates actual humidifier run time to activate periodic drain and fill cycles

Single bow

20x25x4 (3 5/8) Pleated MERV 12 Air Filters 6 Pack Controllers • Adjustable Speed Control (1-20Important 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 20x25x4 filter