I'm moving into a house that currently has an OTR Sharp microwave that vents outside (I can see duct above the microwave in the cabinet). I am going to replace the microwave with a stainless steel model but I'd still like the exhaust to be vented outside. Can I use the existing vent set up for my new microwave? If so, do I need to pay attention to where the vent comes out of the microwave on the new model or are they pretty much in the same location? Can I just buy any model of OTR microwave? Or is there going to be some re-duct work needed if the vent is not in the same location on the microwave?