venting high efficiency flue gases
The COMPLETE exhaust must be run in PVC or the moisture will eat the metal stack. Illegal to do so otherwise. Local codes determine the distance for the intake but it needs to be 3' from a gas meter and at least 1' -3' from other exhausts. May be 3' in your area. You can run the complete PVC inside/up an abandoned metal chimney.
"Cut it twice and it is still too short".
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