"That black spot looks to me like someone was sloppy with their torch while working on the copper pipes and burned the PVC.
The first pipe does look like CPVC I do not recall seeing CPVC listed as approved vent in any instructions. The way PVC cement…"
"Read the instruction manual closely. You should find limits for the size, length and number of bends allowed.
You may want to look inside the pipes, small animal have been known to crawl in and die.
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