Application Of Local Exhaust Air in Fume Hood

Local exhaust is a local ventilation method that removes pollutants directly from the source of pollutants. When pollutants are concentrated in a certain place, local exhaust is the most effective ventilation method to control the environmental damage caused by pollutants. If the overall ventilation method is adopted in this occasion, the pollutants will be diffused indoors; when the amount of pollutants is large, the required dilution ventilation is too large, and it is even difficult to achieve in practice. There are many occurrences of pollutants in industrial plants, such as electroplating tanks, blanking points or operating points conveyed by bulk material belts, welding workbenches, chemical analysis benches, paint sprayers, grinding machines, etc. There are also some cases where pollutants are generated at fixed points in civil buildings, such as stoves in kitchens, hot pots in restaurants, and chemical test benches in schools. It can be seen that the application of local exhaust is very extensive.