Hi all...Thanks in advance for your inputs. I'm trying to figure out how to replace anOTR microwave with. Range hood. Anyone with step by step instructions? Kitchen is in the middle of the house ,about 12' from the wall , on the first floor. How do and where do we run the ductwork for the vent. If I need to call in a pro, would I have to call an. HVAc guy to do this and any idea how much this would cost ?