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If a 75-kW fan motor has a VSD installed that slows down the fan by 20%...

If a 75-kW fan motor has a VSD installed that slows down the fan by 20% what is the effect on air flow rate and the kW savings?

20% CFM reduction, and 36.6 kW savings

80% CFM reduction, and 51.2 kW savings

20% CFM reduction, and 20 kW savings

20% CFM reduction, and 37.4 kW savings
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