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 given fixing bolts and springtime washers. Motors could be sprocket drive or built with winch or belt drum. Features a self-braking worm gear tranny with a patented built-in linear limit switch program with duty and basic safety Ventilation Screening And Lifting Gearbox Greenhouse Geared Motors System switches having excellent switching precision.