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I just installed a dryer vent using semi-rigid aluminum duct. Approximately 7' from where the semi-rigid duct attaches to the dryer at floor level, the duct touches a black PVC drain at ceiling level. The surface to surface contact is probably less than 2 inches. Can the heat from the semi-rigid duct damage or even melt the PVC drain pipe? I suspect the heat from the dryer has dissipated sufficiently at 7' but I have no experience doing this type of work. Thanks in advance for your responses.

  • FYI black plastic plumbing is ABS not PVC. It shouldn't make any material difference to your question, but they have slightly different properties. – Matthew Gauthier Jun 30 '17 at 0:39
  • Thank you Matthew. I've learned a lot in the last 2 days and you have been part of that process. It seems that ABS is actually somewhat more heat resistant than PVC. – Stu Z. Jun 30 '17 at 14:49
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The floor level vent being the damp air exhaust it will not get hot enough to melt the PVC or do any other damage unless there is a lint fire in the pipe. Cleaning the pipe once a year will keep a fire from having fuel to burn.

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