Sharp OVER THE RANGE MICROWAVE OVEN/HOOD SYSTEM Installation Instructions Manual page 6

Step 4.
Place the blower unit into the opening and secure it to
the oven with the screws(
See Figure 11.
Carefully match the exhaust opening location of the
microwave and attach the damper to the rear plate by
sliding it into the guides at the rear plate. See Figure
12,13.
Be sure that the damper hinge is on the top and
the damper swings free into the wall outlet.
) from step 2.
3
6
Figure 11
Damper
Figure 12
Figure 13