Hi,
There are some steps in point form for your
consideration:
1. composition of the exhaust gases for flow
calculations and material selection (corrosivity)
2. maximum flow expected, eventually worse case
scenario or over capacity allowance (if the case)
3. temperature of the exhaust to allow a proper
material selection (see 1. too)
4. review of draft requirements
5. pipe to be insulated or not and height of the pipe
Of course these is probably not everything you need,
but I hope would be helpful. Good luck!
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