ventilation experts - please comment on this idea
In my new kitchen, I will put an induction cooktop on an island. I know that an overhead ventilation system is best but my CD keeps saying I should use a downdraft system to protect my view. If I was to do this, would there be any value in adding an overhead ceiling ventilation system. Currently, I have an industrial sized fan on the roof of the house that vents the existing cooktop. Could I redirect this so that I have a wide cieling vent near the cooktop powered by the existing extractor fan? I would use the downdraft while cooking but could clear the air in the whole kitchen afterwards. I expect that if I used them both at the same time, the overhead would interfere with the function of the downdraft. Is this a really dumb idea or could it be made to work? Thank you.