Centrifugal fans' features1. The latter is more complicated to install;2. The former is often installed at the inlet and outlet of air-conditioning units, boiler drums, induced draft fans, etc.

When experimenting in the laboratory, there may be a lot of easily volatile harmful objects. If the minimum threshold of these easily volatile harmful objects reaches 50 parts per million, the laboratory must be opened quickly. Fume hood or some other equipment capable of exhausting air.