So i'm planning on welding a chimney insert, but I'm curious about the temps that come through it. Let's say that the internal oven temperature is 900F, would that mean that the airflow through the chimney vent would also be 900F or would it cool off some and if so, how much? I'm trying to figure out what gauge of steel to use for the fab. I'm thinking something like 10ga is probably more than enough, but want to make sure I don't get any warping etc.
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