These dwarves are making steel tools and weapons, bricks, plates and other ceramics, as well as (and most importantly for this world) bread all underground crucially from the same structure. Any chimneys or flues can breach the surface, and don't need to be secret.
They've got 15th-17th century technology but no access to electricity. Minimal contact with the outside world (which is at a 21st century technology level), but ample supplies of coal, iron ore, clay and wheat/yeast etc. The dwarves don't want to rely on anything they can't recreate themselves so can't be dependent on trade with non-dwarves. They also don't want to rely on magic but have access to it.
Not all three industries need to be active at the same time of day. Preferably bread is made in the early morning.
I was thinking one giant chimney with the hottest forge fires on the lowest level, and then as the day goes on ceramics and later bread is put in the upper levels where it's less hot.
I don't know how feasible that is or if there's a better set up. Maybe a dragon kiln works better or something else.