Mike Lamb 65 Posted August 11, 2020 Report Share Posted August 11, 2020 I thought I had seen a reference where a Cat 4 vent cannot share the same chimney flue with another gas appliance – in this case a newer lined vent for water heater. Any help? Quote Link to post Share on other sites
Bill Kibbel 82 Posted August 11, 2020 Report Share Posted August 11, 2020 The masonry chimney flue has become a chase for added vents, so they're not technically sharing a flue. The big problem is that's probably an uninsulated single-wall metal flue liner, so there's clearance issues to the PVC vent pipes. Also, the metal liner is not secured with a proper collar and the cap isn't attached with a proper fitting. 2 Quote Link to post Share on other sites
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