Whether the fume purifier should be installed at the air inlet or the air outlet of the exhaust fan can be divided into two types, and the answers are as follows:

Type 1: electrostatic fume purifier. The electrostatic fume purifier should be installed at the air inlet of the fan, that is, it must be purified by the fume purifier before it can enter the fan for discharge. In this case, the wind speed is relatively uniform and the fan is not polluted. Just clean the dust collecting plate of the purifier.

Type 2: If it is a primary or intermediate purifier, it should be installed at the air outlet of the fan, so that the wind resistance is better.