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Can you run supply plumbing through a cold air return duct How about wiring as well?
Wiki User
∙ 15y ago
I'm currently researching this question myself, as I'm investigating a house where Plumbing penetrates the return air ductwork. My initial opinion was "hell no", but as I look into it further, I can't find any supporting arguments anywhere.
So, I'll say it's a bad idea, as water may condense on the piping and extra humidity may be fed back into the A/C system. Cold, humid air is ripe for breeding molds. Your A/C is supposed to be sized properly to remove excess humidity, and plumbing in the return air may upset the balance.
I can't really say pipes in ductwork will do this, but I've seen plenty of cases where an A/C is cooling a space, but it does it TOO fast, and doesn't remove enough humidity. What happens in this case is water condenses in the supply ductwork where mold can breed which then sprays out everywhere everytime the A/C comes on. Worst case.
If you're stuck with the condition and can't easily relocate the plumbing, at the very least I'd recommend insulating the pipes, and making sure where they penetrate is thoroughly sealed.
As for wiring penetrations, I'd avoid doing this as well, especially with metal duct, where vibrations can cut the wiring's insulation over time. If you get an electrical fire in a metal ductwork system, a whole structure could literally go up in flames in seconds. I had the displeasure of seeing the aftermath of that once, as well.
However, I have seen the low voltage wiring for the A/C thermostat run through the return air ductwork. Also, if you have a smoke/fire shut-off for an A/C, wiring for that will also be located in the return air duct.
Wiki User
∙ 15y ago
Wiki User
∙ 7y agoNo. What if the that waste line erupts and spews sewage all through that supply duct ... imagine the smell and all the excessive cleanup that would be required. This would also not meet any building code requirements, either.
Wiki User
∙ 10y agoNo, it is against the plumbing code.
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