Ideally, air from a chimney naturally flows from the fireplace (or furnace) up through
the chimney and out the top. This flow, called Chimney Draft, is what carries the exhaust and smoke
through the chimney and out of the house. A Downdraft condition can exist in a chimney where the natural
flow is inverted and travels down the chimney and out into the house. In this scenario, smoke (or a smoky smell) will accumulate
inside the building.
|This chimney is too short for the main roofline
|The fan at the top solved the draft problem...