Use exhaust fans in today's society is more a kind of exhaust fan, exhaust fan for this, people are more concerned about is its noise reduction problem of how to effectively implement their noise problem that double Improved speed exhaust fan impeller gas flow path, then how to do it? Impeller design we learned two-speed exhaust fan, the inlet of impeller speed and the degree of deceleration of the impeller, the problem is of particular concern. Where we learned that the two-speed exhaust fan down to reduce the speed of the impeller inlet and the impeller increases the degree of deceleration, impeller flow rate can be reduced, reducing the flow loss, improving flow rate of the impeller, but also can effectively reduce noise. For more information about the exhaust fan, small specific analysis for you. 

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