In principle;suction fan It is designed using the principles of air convection and negative pressure ventilation. Negative pressure fans are installed in poorly ventilated areas. During normal operation, they use mechanical kinetic energy to operate the fan, quickly removing stagnant hot air, odors, and smoke from the factory building in a short period of time. At the same time, they circulate and exchange fresh outdoor air with indoor air, thereby achieving the goal of ventilation, cooling, and improving the workshop environment. The high temperature, stuffiness, smoke, dust, and odor gases in the workshop are all discharged outdoors, indicating that the negative pressure fan is also a smoke exhaust fan& nbsp;