Laboratory Fume Hood installation place should not block the ventilation slits

- May 22, 2018-

(1) In the course of the experiment, the experimental device for generating harmful substances shall be placed in the place where the operation opening of the Laboratory Fume Hood inner cabinet is greater than 150mm to prevent the spillage of harmful substances;

(2) The experimental device of the Laboratory Fume Hood shall not cover the ventilation slits;

(3) After the experiment is completed, the fan shall not be turned off immediately and it shall not be closed until after 3-5 minutes;

(4) The Laboratory Fume Hood should not be used as a storage cabinet;

(5) The inside of the Laboratory Fume Hood should always be kept clean and sealed inside the cabinet. It should be thoroughly cleaned and cleaned on a regular basis; if it is damaged, it must be repaired in time;

(6) Ventilators, ducts and related accessories should all be regularly overhauled.

(7) At intervals, the Laboratory Fume Hood shall be measured and adjusted;

(8) The temperature inside the Laboratory Fume Hood, such as the electric furnace with large wattage, should be cushioned, and should not be stored for a long time to avoid affecting the use of the Laboratory Fume Hood.

Laboratory Fume Hood inlet wind speed requirements

The average inlet velocity of the Laboratory Fume Hood should be able to suppress the harmful chemical gases generated in the cabinet to prevent it from leaking. The inlet speed of the suitable Laboratory Fume Hood is very important for laboratory safety, but it is not the only standard. We should take into account various factors to consider the movement of the operators and other equipment items in the laboratory, and the safety performance of the Laboratory Fume Hood, especially When the inlet wind speed is low, it has a significant effect. Therefore, it is necessary to understand the impact and formulate the corresponding laboratory operating procedure specifications accordingly. When the inlet wind speed is too low, the ability of the Laboratory Fume Hood to suppress the flow of air in the cabinet will be greatly reduced, which will lead to corresponding risks. Therefore, we recommend that the inlet wind speed be greater than 0.3 m/s.

The exhaust fan speed and the Laboratory Fume Hood exhaust valve shall be controlled to adjust the Laboratory Fume Hood, and the control device for the exhaust air volume shall be designed rationally to ensure that in the constant air volume system, unless the Laboratory Fume Hood is stopped or there is a written danger description there are additional requirements In addition, the minimum amount of exhaust air should take the maximum of the following two values: 50 cfm/ft x ft (width of the Laboratory Fume Hood) or 25 cfm/ft 2 x ft 2 (work area of the Laboratory Fume Hood).