"Exhaust Fan" hot indoor air can quickly exhaust the air outside the other side of the suction chamber, the temperature and the outside temperature reaches unchanged and will not in the shop temperature. Process air flow will take away the body heat, the air flow to accelerate sweat evaporation heat absorbed by the body, thus allowing the body to feel cool, to cool and natural, like the wind. "Exhaust Fan" installation must be reliable, solid, with more than 2.3m from the ground; this fan to the distance between the roof must meet more than 5CM; remember ceiling Do not install more than soot, dusty place, to leave high temperature source; either wall with fan ventilation in the workplace, can also be used for pumping soot; "Exhaust fan" to remind you when the use of power outlets, power cord should be connected with the safety standards of the plug.