By using the air flow of the fan to form positive pressure in the air duct, forced ventilation can be achieved to regulate the internal environment of the greenhouse, achieve ventilation, cooling, and air flow uniformity, making the greenhouse environment more conducive to plant growth, and increasing the uniformity of air flow and temperature and humidity in the crop root environment. Compared with greenhouses without air duct ventilation systems, it can reduce the number of top windows, lower the frequency of opening top windows, and reduce the number of mechanical ventilation systems, reduce energy consumption, improve resource utilization, and reduce costs. The specifications of the air duct are φ380,φ500,φ600,φ800. If it is a support-type cultivation gutter, the diameter of the air duct should not exceed the distance between the two supports.
