Installation of industrial exhaust fans after the location is determined, the installation of industrial exhaust fans in the plant outside the other three walls windows to find a suitable factory to supplement the fresh air intake, we look for the air intake is best to avoid the outside after noon, the high temperature of direct sunlight, as far as possible, the intake is set up in the outside world of the shade, the air is clean, cool location, pay attention to look at the air intake exhaust formed by the air flow routes, the best hot stuffy air when pumping the air into the room, the best hot stuffy air does pass through the body of the employees above the head position is the fastest pumped out of the outside. In the extraction of hot stuffy air, it is best that the hot stuffy air does pass through the staff's body, higher than the top of the head of the location of the fastest pumped out of the outdoors, the plant outside the fresh cool supplemental air into the room, it is best to pass through the human legs above the location of the inflow, so that the air flow route people will feel very comfortable. The air inlet can also be considered to be open factory door often open the window.