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I have a question regarding some theory I read in the text The Kiln Book. On page 78 of the 4th Edition, it states that: "At the point where the exit flues enter the chimney, they should be restricted so that the chimney cross section is larger than this flue area" In the diagram (3-11) beneath this, it shows decreasing the point of entry to the chimney by 25% (from 4 bricks to 3), coming from the kiln exit flue. What's the thought behind this? I'm happy to trust my elders, but I'd also like to know what the theory is. I'm curious how this decrease affects the firing, vs keeping the same area of flow in the inlet flue>exit flue>chimney entry>chimney. As I'm building a chimney coming up in the next couple weeks, I'd love to figure this out. I can taper in the walls of the exit flue to the entry point of the chimney, which would accelerate flow heading into the chimney (while also creating slight backpressure?), which would then open back up to the full area of the chimney as it rises. Thoughts? Thanks in advance!