Because the fan is mechanically made for rotating clock wise if if would have mechanically made to be rotate anti close wise it would rotate anti clock wise. hence the main thing the machine has an mechanically made for what it has will do that only, it wont change at any cost.

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The fan has been mechanically manufactured to rotate in a clockwise direction. If it would have been manufactured to rotate in anti-clockwise direction, it would've done so. There would've been no problem.