Look at the charts found in the NFPA 54 under venting. It will have a table based on btu load, height of chimney, length of pipe from heater to chimney and what temperature your area experiences. You can get this info on-line.
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Look at the charts found in the NFPA 54 under venting. It will have a table based on btu load, height of chimney, length of pipe from heater to chimney and what temperature your area experiences. You can get this info on-line.