Application field: Model 4-79 Centrifugal Blower may be used for the indoor ventilation in ordinary factory or in large-scale building, conveying air or other gas which may not self-ignite, do no harm to human body or is not corrosive to the steels. No glutinous matter is allowed in the gas. The dust or grain matter is no more than 150mg/m3. The gas temperature is no higher than 80℃.