This type of fan is commonly used for mine ventilation or industrial systems whose characteristics vary widely. ... In addition, the non-overloading feature of the backwardly inclined and airfoil design wheels is an important advantage of this fan. 4. ... Industrial Ventilation aa A Manual of Recommended Practice, ACGIH, P.O. Box 453, Lansing, Michigan, 12th Edition, 1972. ... HEMEON, W. C. L., Plant and Process Ventilation, 2nd edition, The Industrial Press, , New York, 1963.
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