[BB_TX]

Unless they have changed, the micro/convection cabinet is not provided with an outside vent. I know some of those who have posted pictures of the blackened wall behind the micro/convection had no way to vent at all.

My older rig micro/convection actually had a metal duct attached to the back of the cabinet, up the back of the cabinet from the hot air exhaust opening, over the top of the cabinet toward the front, and the heat vented thru the front grill/frame.