Detail:Working Voltage DC24V Standard Operation Power 50W(2.5A) Torque 40NM Speed 3.7rpm Maximum Operation Powder 84W(3.5A) Torque 60NM Speed 3.4rpm Weight 2.4kg Rolling capacity : 50m (L) * 2m(L) One motor for one side ventilation side ventilation will need the creeper also , Need thhe controller with switch to open power and close. The Motor-driven Film Rolling Machine replacing traditional manual roll-up unit to reach high speed automation in revolving & releasing films and greenhouse environment, it is the new generation of greenhouse ventilation and temperature regulation facilities.outPortability, output torque, output lock, wide range and precise adjustment, waterproof, dew-proof and power-saving are the key characteristics for Electric Roll-Up Unit, which is the best choice for modern daylight greenhouse applied in different climates.