... vent. Rack and pinion vent is the first option for multi connected span greenhouses venting system, it features reliable ... and it is easily automatic control.Product Description:Specialized for greenhouse vent open and closeBig torque capabilityWide application usageStable ... FLC-Gear Motor, Rated Voltage: 220v/380v, Rated Power: 0.55KW,0.75KW, OutputTorque: 800N.m Gear Motor for Greenhouse Ventilation