In the early stage of laboratory design and planning, one must consider an issue related to the future development layout of the laboratory. In order to prevent some vapors, gases and particles (smoke, soot, dust and aerosols) from absorbing pollutants, perhaps some toxic substances, fume hoods, hoods or local ventilation methods must be used to clean them. In the safe operation of the processing laboratory, it was found that the use of all-steel fume hoods is more effective.

Its exhaust system can be divided into two types: centralized and decentralized. The following editor will introduce to you the characteristics of these two exhaust systems:

Centralized: The centralized exhaust system is toAll steel fume hoodform a system. Its characteristics are that there are few fume hoods, which can save equipment investment, and it has good adaptability to slight increases or decreases in the number of equipment and changes in location. However, its disadvantage is that due to the large system and unbalanced air volume, although each device is equipped with a regulating valve, it is inconvenient to use and it is not easy to meet the predetermined effect. If the air duct of one of the systems is damaged and needs to be repaired, the equipment of the entire system will not be able to function normally. Therefore, laboratories that previously used centralized systems have successively switched to decentralized systems.

Distributed: Distributed installation of exhaust systems is currently a method commonly used in laboratories. The advantage of this exhaust method is that the fume hood can be opened and closed according to the working needs of the all-steel fume hood. They do not interfere with each other, can easily meet the predetermined effect, and save energy than the centralized type. Since the decentralized system is small and the exhaust volume is also small, the air volume and wind pressure of the equipment are not large, and the noise and vibration are correspondingly small. Another advantage of the decentralized type is that it is easy to handle the discharge of harmful gases of different properties. But it also has its limitations: there are many ventilators and many systems. If the ventilators are centralized in the computer room, the cost of laboratory construction will be increased. However, all-steel fume hoods are distributed and installed on-site. Although the investment in ventilators increases, the investment in air ducts can be saved, and the total cost estimate will not be much different.