Ram air can give a portion or all of the necessary cooling air flow, and the fan remains disengaged.
Ram air turbine -- a propeller used by aircraft to generate power
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Parafoils, also called ram air parachutes, non-rigid airfoils inflated by wind
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Short ram air intake -- a smaller, aftermarket version of ram-air intakes, commonly used on automobiles
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Ram-air intake -- an air intake system that aids in engine performance and cooling, commonly used on aircraft and other high-performance vehicles
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Compression is achieved through the ram-air effect in an intake similar to that found on a high-speed aircraft like Concorde, where intake ramps create shock waves that compress the air.