The EP electric motor gearboxes are maintenance-free, compact 201902071320455467551power 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 equipped with winch or belt drum. Includes a self-braking worm gear transmission with a patented integrated Ventilation Screening And Lifting Gearbox Greenhouse Geared Motors System linear limit switch program with duty and safety switches having superb switching precision.