Step.3
Roll the blower unit so that the fan blade openings are facing back ( rear of unit ).
* If you want VERTICAL, roll the blower unit so that the fan blade openings are facing upward.
CAUTION: Wires to blower unit must be muted
avoid to pinching, before reinstallation of cover plate.
Horizontal duct configuration
Step.4
* Carefully match the exhaust opening location of the microwave oven and reinstall screws(I,2).
Vertical duct configuration