The bottom cover is fastened with four screws. Remove those.
Once the bottom cover is removed, the blower motor is clearly visible.
Where the power cable attaches to the motor, are four diodes. These diodes only allow half-cycle of a full cycle of positive and negative power cycle to reach the motor.
The motor only gets current in one direction,allowing it to spin in one direction. After all, we are dealing with AC current here.
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