Chain Crank (AA) 30'x45' Control speed to optimize efficiency

Control speed to optimize efficiency

It is compatible with all GC-315 CMH

J&D Manufacturing's Wall Master greenhouse exhaust fan offers high volume output and smooth

• Analog inputs selectable for 0-5V or 0/4-20mA

Status of manual override knob is returned to the master GCX control system to notify of an override condition

Chain Crank (AA) 30'x45' Control speed to optimize efficiencyChain cranks (Gear Chain Wheel including Roll Bar Adapter) are used for manually pulling greenhouse light deprivation curtains. If you have a smaller greenhouse that does not use automation, you can use chain cranks to pull your curtains and save on electricity costs.