Suppose - panels on either side of the range plus a couple inch space between range and backwall, to direct MUA up through cooking area and into vent hood? If gap between panels/wall and range is 2", and range back is 36" and sides are 33", that is about 2 sq ft, so air can slow to 6 ft/sec, hmm still sounds too high - high enough to blow out pilot lights, distort burner flame patterns, etc.