Now, whether it is plant workshop, office buildings or other buildings, all are equipped with ventilation pipes. The role of ventilation pipes is exhaust, dust, etc., generally divided into full exhaust and local exhaust. Today, Xiaobian, respectively, from the overall exhaust and  local exhaust ventilation in terms of these two aspects of ventilation  pipe design basis.


       Full  exhaust is generally installed in the external wall of a certain number  of exhaust fan, relying on the exhaust to make the room negative  pressure, ventilation pipe design to take into account the outdoor fresh  air through the doors and windows into the room, so that the entire  workshop ventilation and harmful Gas concentration dilute to meet the health standards. In the installation of ventilation pipe to remind you that when  several kinds of solvent vapor or several kinds of irritating gas at  the same time distributed in the air, the ventilation volume should be  diluted to the maximum allowable concentration of the required amount of  air required.


       Partial  exhaust ventilation duct design to take into account the harmful gases,  vapors and dust dispersed in the workshop, the main use of local  exhaust system from the source directly discharged from the outside. The  local exhaust system consists of local exhaust hood, ventilation duct,  fan, dust or harmful gas purification equipment and exhaust device. When  the resulting harmful gas, steam or dust of the workpiece is large and  can not be processed in the exhaust cabinet, you can use one side open,  the other side of the closed side of the exhaust hood, or parties can  not be closed side of the exhaust Cover, or the upper exhaust of the umbrella hood, a single side of the  exhaust, both sides of the exhaust and blow the tank side of the  exhaust various forms.