A fume hood is an indispensable part of laboratory furniture. Wind and ventilation in the lab. Experimental operation produce a variety of harmful gases, odor, moisture and inflammable, explosive, corrosive substances, in order to protect the safety of the user, to prevent the spread of pollutants to the laboratory, in the vicinity of pollution sources to use fume hood, fume hood before using the Numbers is less, only in particularly harmful and dangerous gas and produce a large amount of heat used in the experiment. The ventilation cabinet is only for the auxiliary function of the test bench.
In recent years, considering the improvement of the experimental environment, the experiment carried out on the experimental stage has been gradually transferred to the ventilation cabinet, which requires the most suitable function for the equipment to be used in the fume hood. In particular, most new laboratories require air conditioning, so the use of ventilation cabinets should be incorporated into the air-conditioning system in the preliminary design phase of the building. Because of the fume hood occupies very important position in the
biochemical laboratory, from the improvement of laboratory environment, improve the labor hygiene conditions, improve the work efficiency into consideration, such as the use of the fume hood number by leaps and bounds.
The fume hood is classified according to the exhaust mode: it is divided into the upper exhaust air type, the lower exhaust air type and the top and bottom line. Uniform wind speed, in order to ensure the work area for the cooling process of fume hood should use the lower exhaust type, for thermal process of the fume hood adopt upper exhaust type, the calorific value is not stable, the process of air outlet can be set inboth up and down along with the change of calorific value contained in the adjust the ratio of upper and lower exhaust air volume, and uniform wind speed is obtained.
The fume hood is classified according to the exhaust mode: it is divided into the upper exhaust air type, the lower exhaust air type and the top and bottom line. Uniform wind speed, in order to ensure the work area
for the cooling process of fume hood should use the lower exhaust type, for thermal process of the fume hood adopt upper exhaust type, the calorific value is not stable, the process of air outlet can be set in both up and down along with the change of calorific value contained in the adjust the ratio of upper and lower exhaust air volume, and uniform wind speed is obtained.
The fume hood is classified into three categories according to the wind inlet. It is widely used to call the exhaust air in the back of the cabinet through indoor air inlet.
Wind ark according to the using status classification can be divided into the integral lower open, floor, two, three sides of glass, the table type, even the asana and designed according to the needs of different experimental use of radioactive experiment, synthetic experiment, across chlorate experiment of special fume hood.
Safety is the most important mission of ventilators. The use of ventilation cabinets in laboratories is to ensure the safety of users and prevent pollution to the surrounding environment.
The fume hood shall be safe when used:
Before the experiment begins, it is necessary to confirm that the fume hood should be in a running state before the experimental operation can be carried out.
At least five minutes before the end of the experiment, the ventilator can be turned off to discharge the residual gas in the pipe. It can also be considered to install the exhaust time delay device to ensure that the ventilator is delayed.
In the experiment, do not put any equipment in 150mm from the glass window. The large experimental equipment should have sufficient space, and should not affect the flow of air. The front window should be turned off as much as possible.
