Hello - I am installing a new over-the-range microwave oven and need help on installing the soffit for venting. The microwave will be installed on an exterior wall so I plan on having it vent out straight through the wall (I checked my model # and the blower direction allows this to happen). My question is, how do I properly vent it outside? I have been looking for kits at Lowes/ HD and cannot find anything. The closest thing is a Dryer Vent Kit, which I do not think will work. My wall is comprised of 1/2" drywall, 2x4 framing (Roll insulation in between studs), 3/4" sheating, and then the exterior is stucco. Any assistance in how to properly do this is greatly appreciated.