How to deal with the noise of laboratory fume hoods and fume hoods

Noise treatment method of exhaust cabinet and fume hood in laboratory The fume hood is an indispensable exhaust equipment in the laboratory Reasonable installation can effectively reduce the harm of the laboratory staff from the chemical gas I have been to many laboratories Some laboratories have either a big smell or too much noise The smell is that the exhaust is not well handled There are many reasons for the noise Here is how to solve the problem of the noisy fume hood in the laboratory Problem If more than one fume hood is installed in a laboratory, the better way is to use a set of exhaust system, that is to say, install outdoor centrifugal fan If each fan is installed separately, turn on all the fume hoods when doing the experiment Those fans are working at the same time, and the buzzing noise is a little unbearable, so we can only install outdoor centrifugal fan, outdoor centrifugal fan Generally, the machine is installed on the roof What if the top floor is an experimental building or an office building? Is there no noise when the outdoor centrifugal fan is installed on the roof? The answer is very simple There must be noise from centrifugal fans, which is even louder than that from indoor axial-flow fans How to deal with it? Let me introduce some methods to deal with the noise 1 Shockproof pad: when installing the fan, the shockproof pad under the fan can effectively reduce the noise 2 The thickness of the exhaust pipe can also affect the ventilation noise The ventilation pipe should be as thick as possible The thick pipe can not only reduce the noise, but also the ventilation effect is much better than that of the thin pipe Generally, the pipe with diameter of 350 or 400 is suitable 3 The frequency conversion system, if conditions permit, is installed The frequency conversion system means that if the laboratory is installed with four fume hoods, if I only start two fume hoods, the noise is only one-half of the four at the same time If I only start one fume hood, the noise is only one-quarter of the total start-up