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Closeup of the massive fan and controller antennas.
This is a brushless DC motor, which is fairly standard for fans in devices like this. Brushless motors are quieter than more traditional fans, but require fine computer control to function. It is not a maglev fan like Apple is known to use, however.
The Bluetooth and WLAN antennas, intentionally three-dimensional in design, are attached to the lower case with Phillips screws.