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Centrifugal fan is generally used for indoor ventilation of large buildings such as factories, and for high pressure forcible ventilation of boilers and forging boilers and other occasions of materials handling. Types of gas handled by centrifugal fan is air or other non-explosive and non inflammable gas and gas non-corrosive to steels. Stickum should not be contained in gas, dust and hard corpuscular matter contained should not be larger than 150mg/m3. Temperature for gas handling should not exceed 80°C。