It is recommended to clean, because under the double action of static electricity and high voltage for a long time, the molecules of oil fume are adsorbed on the electrode plate of the electric field of the hood purification machine. After long-term adsorption, the electrode plate of the electric field of the hood purification machine will be very dirty, which will lead to many problems, such as fire, ineffective purification, abnormal sound inside the electric field and so on.