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The information about the Viking range scares me since I just purchased and Viking dual fuel range and hood system. I am having issues with the VEV900 exterior mount ventilator though. I purchased what I though to be a ventilator which would mount on an outside 8' wall but when the contractor went to install the ducts found they were cutting right through the top plate. Since the top plate is a structural requirement I can't install the ventilator as hoped. We are now struggling to find viable options for installing what I have sitting in my new kitchen. The customer service I have received from Viking has been less than helpful - they don't have any ideas. BUT it does look professional! DON'T purchase the VEV900 to mount on an exterior wall if you have 8' wall. There are no instructions for installing without reframing the wall.