Originally Posted by
Peter Ottowitz
Would this air flow create a potential fire hazard?
Yes.
That's a quick way to burn a house down ... create a contained *and intended* "chimney effect" between two walls ... and that is just what you will get.
That area would need to be fully sprinklered with smoke and heat detectors placed strategically with that space and which would automatically activate the sprinkler system to have any chance of survival for the occupants.