This kind of boiler without mechanical ventilation of blowers and induced draft fans is distinguished as natural draft boilers.
这种不采用鼓、引风机机械通风的锅炉，称之为自然通风锅炉。
This kind of boiler without mechanical ventilation of blowers and induced draft fans is distinguished as natural draft boilers.
这种不采用鼓、引风机机械通风的锅炉，称之为自然通风锅炉。
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