The EP electric motor gearboxes are maintenance-free, compact power units for traveling ventilation, screening and lifting systems in greenhouses and livestock sheds. Electric motor gearboxes are given fixing bolts and spring washers. Motors can be sprocket drive or built with winch or belt drum. Features a self-braking worm gear transmitting with a patented built-in linear limit switch system with duty and protection switches Ventilation Screening And Lifting Gearbox Greenhouse Geared Motors System having superb switching precision.