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Closed wind is generally installed in the dust ash bucket below, in order to ensure tight no leakage at the connection, top should be kept (storage) must have high levels of dust. Because the impeller turns, the discharged dust on impeller side, often there is no dust, so easy to make air leakage into the. In order to maintain a certain height of the ash column and not empty, preferably installed material level signal facilities at the ash bucket and chain with clean relief valve motor.