The Elero Box 5 motors may be used to operate greenhouse roof vents, wall vents, and rolling curtain systems. The 120V unit produces 352inlbs of torque at 14rpm. The 220V unit produces 528inlbs of torque at 14rpm. Both units are reversible and have a maximum of 21 rotations in each direction. The travel distance of both directions is controlled by adjustable internal limit switches.