The ventilation system of a greenhouse usually consists of two methods: side wall ventilation and ceiling ventilation. Side wall ventilation achieves air flow by setting openable windows or doors on the side walls of the greenhouse, while ceiling ventilation promotes air flow by setting openable skylights or ceilings on the top of the greenhouse. These ventilation systems can be equipped with automatic controllers as needed to automatically adjust the opening and closing of ventilation equipment according to changes in temperature and humidity inside and outside the greenhouse, helping to maintain an ideal growing environment inside the greenhouse.