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http://www.electricfanengineering.com/turbine-electric-fans/over-the-road-truck-tractor/ 24v is half the amps of 12v so I would look at a high voltage 12v alternator with a 24v equalizer

Only thing you are going to find that is equal to the engine run fan is going to be a turbine electric unit or a hydraulic unit. Turbine electric unit max out around 30in and 10,000cfm. There are some surplus military units that are hydraulic from the HEMTT trucks. They move enough air to...