There is a problem in a double oven (one above the other) but in the same carcass (Shell). When the bottom oven is on and running at 200C the top oven, which is switched off, is warmed by heat from the bottom oven. The top oven temperature has been measured at 100C of heat transfer. The same is true, but to a lower temperature, if the top oven is on and the bottom oven is off.
I am trying to find the specification/regulation for the double ovens that states what the permissible heat transfer is.