If reducing the voltage supplied to the fan motor is not convenient then reducing the power by using a PWM controller should work, since the fan is a DC powered device.Something not being said but that may clear up a misunderstanding the fan will try to draw its rated power regardless of what the power source is rated at.
A recent example is a 100 watt lightbulb connected to household wiring that can typically supply well over 1,000 watts still only draws the 100 watts it was designed to draw.
To reduce the current drawn by your fan you need ti reduce the voltage to the fan. This will not wotk well with some kinds of motors.
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by Jake Hertz
by Luke James