The EP engine gearboxes are maintenance-free, compact power units for driving ventilation, screening and lifting systems in greenhouses and livestock sheds. Engine gearboxes are given fixing bolts and springtime washers. Motors could be sprocket drive or equipped with winch or belt drum. Features a self-braking worm gear Ventilation Screening And Lifting Gearbox Greenhouse Geared Motors System tranny with a patented built-in linear limit switch program with duty and safety switches having excellent switching precision.