Laboratory ventilation system design includes which aspects?

First, the classification of the ventilation system

1,the whole ventilation

The whole test room for comprehensive air circulation ventilation. When the toxic harmful gases occur in a large area dispersed to the test room interior, must be effectively discharged in a timely manner indoors, together with the need for a certain amount of fresh air to make up for, to prevent the emergence of negative pressure. The concentration of toxic harmful gases is controlled within the scope of the rules. 

2,Partial ventilation 

Toxic harmful gases through the fume cupboard, absorption hood, exhaust hood other part of the ventilation equipment for part of the ventilation process, to prevent harmful gases dispersed to the entire room; can also be based on the gas concentration of the size of the selection of forced exhaust. Forced exhaust, also known as mechanical exhaust, the use of part of the wind pressure generated by the exhaust with the help of ventilation ducts for the discharge of the whole. 

Second, the selection of air volume

Selection of air volume is based on the room exhaust requirements to carry out the size, according to the nature of the test room is different the corresponding standards are also different. The selection of the test fan with the primary speed / power / pressure value have a certain connection, the fan pressure ventilation system resistance value has a connection, the selection of the fan is also a very important part of the test room ventilation system.

Third, fan selection

1, the correct selection of fans, is to ensure that the ventilation system normal, economic operation of an important condition. The so-called correct selection of fans, mainly refers to the nature of the gas being transported the use of the selection of different uses of the fan: the selection of the fan to meet the system's demand for air volume, together with the fan's wind pressure to be able to overcome the resistance of the system, in the efficiency of the permissible economic use of the scope of work.

2, according to the nature of the gas being transported, the selection of different uses of the fan. Such as the transportation of clean air, dusty gas flow through the fan has been purified, can be selected for general ventilation fan; transportation of corrosive gases, to use anticorrosive fan; transportation of flammable, explosive gases dusty gases, to use explosion-proof fan dust exhaust fan. Detailed in the selection of the type of fan also needs to be based on the actual nature of the laboratory to decide.