The basement ventilation and smoke exhaust project is divided into clean ventilation, poison filtration ventilation and isolation ventilation. A new generation of basement ventilation equipment-Yashe brand indoor fresh air purification system developed by Qingdao Shuangjin Installation Engineering Co., Ltd. is designed by using the principles of air convection and negative pressure ventilation. The negative pressure fan is installed in a place with poor ventilation. During normal work, the mechanical kinetic energy is used to make the fan run, so that the hot air, odor and black smoke trapped in the basement can be quickly discharged outside in the shortest time, and at the same time, outdoor fresh air and indoor air can be exchanged circularly to achieve the purpose of ventilation, cooling and improving the workshop environment.

Ventilation mode of basement ventilation engineering can be divided into two types according to ventilation power:

First, natural ventilation. The natural pressure difference can be used as the power of ventilation by using the wind pressure generated by the air circulation outside the project and the hot pressing generated by the air temperature difference inside and outside the project and its import and export. Natural ventilation is economical, but it can only be used conditionally because of the influence of season, wind direction and wind speed, as well as the limitation of hole direction, height difference and engineering building form. When the underground works are tunnel-type, and the tunnel body is not long, and the requirements for temperature and humidity are not high, such as short tunnels, underground warehouses, underground boiler rooms, underground power plants, etc., they can be considered.

Second, mechanical ventilation. Take the wind pressure generated by mechanical equipment (such as ventilator) as the power of ventilation, control the intake and exhaust air volume, heat, refrigerate, humidify, dehumidify and purify the air, and give full play to the efficiency of ventilation (including air conditioning) technology, which is used in occasions with high air environment requirements or large ventilation resistance.