This guide details the removal of the main fan from the fan housing.
Pull on outer latch.
Lower door until it is level with your work surface.
Remove the screw from each of the two niches on lower part of fan using the Phillips #1 screwdriver.
Remove the power cable from the fan and detach bracing.
To fully remove the fan, unfasten the 4 screws on the front of the bracing using the Phillips #2 screwdriver.