Fragile infrastructure (Page 3/3) MidEngineManiac NOV 15, 08:25 PM House I grew up in had a coal furnace converted to oil in the early 60's. Coal chute was a 6x16 room with a split-door and access to the outside to shovel it in. By the time I can recall (early 70's) there was still traces of that black all over that room in between the boards ect.