Fireplaces in the basement and living room (shown) both had normal flues in this big masonry chimney.
Main floor- on the kitchen side was what looked like a two-section pizza oven, but the lower and upper, although they both were lined what looked like firebrick, were not connected. The upper oven had what looked like an 8-inch flue, but there was no smoke shelf and looking up into it, it curved away out of sight about four feet up.
Can’t build a fire below to heat the upper section 'cause there’s no flue. No reason to buld a fire in the upper section, 'cause with no smoke shelf it’ll smoke like crazy, it wouldn’t warm the lower section and there’s no place to put food if the thing’s got a fire in it.
Each fireplace had a little vent on the side of the firebox which had a sliding cover. The chimney partially terminated on the second floor and two three-inch vents were visible.
Think these vents were somhow routed around the pizza oven thingie to heat the firebricks/oven?