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Old 11-12-2012, 01:24 PM   #1
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Waste pipe through cold air return


Renovating the bathroom and moving the location of the toilet. The waste pipe for the toilet will run under the floor between two joists, however, part way down the joist run there is a cold air return that boxes in the joists. Can I run the waste pipe through the return or do I have to go under it?

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Old 11-12-2012, 06:29 PM   #2
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Waste pipe through cold air return


I wouldnt do it. You run the risk of vibration noise, a place for dirt to accumulate, and I dont think it would meet code. Can you move the duct? or reroute the drain?

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Old 11-12-2012, 07:51 PM   #3
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Waste pipe through cold air return


You can pipe within an air plenum as long as you meet the fire codes- basically noncombustible materials only and the penetrations should be sealed with fire caulk.
A lot of buildings use the space above a suspended ceiling as plenums. It's one less duct system to install. But then fire rated assemblies are required.
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