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By certification 
Indoor ventilation 4-68 type centrifugal fan can be applied to General Factory and large buildings, can be used as the input gas, but also can be used as the output of gas, harmless to the human body, non-corrosive gases of steel materials.
Traffic: 565~239655m? /h
Full pressure: 215~3863pa
Machine: 2.8~20B 14
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