Fume hoods are classified according to their use conditions: they can be divided into integral lower part open type, floor type, two-sided type, three-sided glass type, table-top type, one-piece type, as well as radioactivity experiments and pair synthesis experiments designed according to different experimental use needs. Yes, a special fume hood for perchloric acid experiments. Common fume hood classification
1. The exhaust type fume hood is called the full exhaust type through the indoor air intake and circulates in the cabinet, which is a type that is very widely used.
2. Supplementary air fume hood When the fume hood is installed in a room with heating or temperature and humidity control requirements, in order to save heating and air conditioning energy consumption, the method of taking the supply air from the outside and circulating it outside the cabinet is called supplementary air. Type fume hood.
3. The general constant air volume system of the variable air volume fume hood needs to manually adjust the air valve of the fixed blade, adjust the exhaust air volume of the fume hood, and reach the desired surface wind speed when the valve is adjusted to a certain angle. Variable air volume control is to change the air volume to reach a given surface wind speed by adjusting the sensor of the valve. Of course, the standard type has low cost and high variable air volume cost, which is suitable for occasions that require high precision. Fume hoods are classified into three types according to the exhaust method: upper exhaust type, lower exhaust type and upper and lower exhaust simultaneously. In order to ensure uniform wind speed in the work area, the lower exhaust type should be adopted for the fume hood in the cold process, and the upper exhaust type should be adopted for the fume hood in the hot process. For the process of unstable heat generation, exhaust outlets can be set up and down along with the cabinet. The change of the internal heat generation adjusts the ratio of the upper and lower exhaust air volume, so as to obtain a uniform wind speed.