I know that zeya (steam, kinda) is a problem in cooking milk and meat. Also heat can be a problem.
My friend recently burned some burgers in his oven (we think it was a grease fire), and watched copious amounts of smoke come out of the vents. (the fire went out quickly and everyone's okay just his kitchen smells now) The vents are placed right next to the stove, upon which he had a cold milchig pan.
- does that milchig pan need to be kashered now?