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NW Washington | I vaguely recall from my college days that the design of a centrifugal fan affects the power required to operate it, and some fans draw more current if they have no airflow resistance on the exhaust side. All the details escape me, but this might be a factor in this situation. Here is a little cut and paste on the fan, type of blades, and power draw.
Optimum usage range
Optimum functioning of centrifugal fans with backward-curved
blades is obtained when the operating point is close to the point of
maximum efficiency. If consideration is also to be given to the economical aspect, it is best to ensure that the operating point of the fan
selected is at or just to the right of the optimum point.
Centrifugal fans with forward-curved blades have different operating
characteristics. Here again it is important for the operating point to be
close to or slightly to the right of the optimum point – but it should be
remembered that the power required by centrifugal blowers increases significantly with decreasing back pressure. This can lead to
overloading of the motor.
The "ebm-papst FanScout" selection software (see Page 13) presents
the important factors, namely maximum efficiency and minimum
noise, so you can always make the right choic
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Can somebody with a 9xx0 case Steiger tractor tell me how many amps the cab blower pulls?
