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(I think this is how it works)
1). If you have a small starter fire in a large cold chimney, the heat and vapors go up and quench on the sides of the stack and then fall back down into the fireplace/room. So you need to burn kindling and tinder at first, and maintain a hot clean fire, until the entire square tube warms up enough.
2). The flue/choke divides the verticle tube so the fireplace area heats up quicker. Thus this mass of hot air keeps an upwards pressure and prevents reversing of flow.
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