Selection and arrangement of fume cabinets

The most important function of the fume cabinets is to control the various harmful gases, water steam, odor, waste heat generated during the experiment,control them in the ventilator and emit them to outdoor, to protect the user's safety and prevent the spreading of the pollutants from the laboratory.

The fume cabinet has a very wide application in various biochemical and physicochemical laboratories. It plays an important role in the protection of the purity of the experimental sample, the accuracy of the experimental results, maintainance of the laboratory environment and improvement of the labor and health conditions and work efficiency, etc. .

We usually measure the performance of the fume cabinets with three parameters: capture efficiency, inhibition efficiency, and efficiency of excluding harmful gases. The key to a reasonable ventilator design and maintaining the wind speed of the ventilator opening is to obtain higher inhibitory efficiency. The efficiency of excluding harmful gases is achieved by the height and appropriate wind speed of the outdoor discharge port.

The arrangement of the fume cabinets: the fume cabinet is an important part of the laboratory furniture, and it is also an indispensable necessary condition. Therefore, when we choose the laboratory fume cabinet , we will usually investigate the safety factor of the ventilator and the principle of ventilation, but ignore a very important issue, that is the layout problem of the wind cabinet.

From the current fume cabinet design principle, the frequency of usage throughout the laboratory is high . If we don't pay attention to its layout, it is likely to reduce the advantages of the fume cabinet, thus can't completely play their own function. In fact, the choice of the position of the fume cabinet is mainly based on the type of the fume cabinet, which includes the material and shape of the fume cabinet, etc., but also according to the size of the laboratory.

When considering the layout of the fume cabinet, we first choose the location according to the direction of the laboratory. Because the direction of the laboratory is the direction of air circulation, the indoor air is guaranteed to a certain extent based on this orientation.

Secondly, according to the material of the ventilator, if it is some special materials, then some are not able to expose, so we must put the fume cabinets in some cool positions, don't be too close to the window. In addition, we can’t ignore another important problem, that is, the location of the installed position should be  suitable for facilitating maintenance and overhaul.

The number of fume cabinets in the workplace is based on experimental research types, and there is large difference. Generally in the research institute and universities, chemical research laboratory is equipped with 1 fume cabinet each researcher , and physics laboratory may set up 1 fume cabinet in all. The type of ventilator is determined by the experimental nature and laboratory process requirements. We should comprehensively consider various factors to determine the form of ventilation , ventilation systems , replacement system, and determine the position of ventilation machine rooms and ventilation shaft.

When considering the laboratory fume cabinets, it is necessary to make selection according to the experimental content of the laboratory, select the corresponding shape and specification; and the experimental reagent required for experimental content to control the wind speed and whether to use the dedicated Ventilation cabinet. Select the ventilate box that meets the needs of experiment to  ensure the comfort and safety of the usage.

Tags：fume cabinets