Some part of vapor would condense dew and attach to the inner wall of the tube,and dust parse to dew in turn,which is the forming causes of the dust layer with high strength.

• 露水又粘结尘灰,形成一层粘结强度很好的尘垢层,影响抽尘热风流正常流动,也影响风管的使用寿命。