The EP engine gearboxes are maintenance-free, compact power units for traveling ventilation, screening and lifting systems in greenhouses and livestock sheds. Electric motor gearboxes are supplied with Ventilation Screening And Lifting Gearbox Greenhouse Geared Motors System fixing bolts and springtime 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 program with duty and safety switches having superb switching precision.