Cabinet-type centrifugal fans are widely used in the air-conditioning industry due to their small longitudinal dimensions, low noise, and large heads. For automotive air-conditioning, due to the full consideration of human comfort requirements, the use of cabinet-type centrifugal fans without exception as the power to send air-conditioned air to the vehicle through the evaporator. As an air-conditioning fan, the air supply volume is an index that must be met. Under this premise, the only factor we must take into consideration is the noise at work. Due to improper design, most of the time, the single design considers the requirement of air volume or noise, and the fan will appear to flow back at the time of work.
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