Pex in fresh air return

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Posted by: from Airdrie
3/30/2017 at 7:43:22 PM

I want to run a water line to my fridge. Can I run pex inside fresh air return?

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Vlad from Mister Plumber in Toronto
Date/Time3/30/2017 at 8:11:32 PM

Running PEX inside fresh air return doesn't harm pipe. One thing that it will restrict the air flow, but because the pipe is tihy, it is Ok. You can not run drain ABS pipes because, in case of fire, harmful fumes from ABS will be spreading everywhere.


Mister Plumber

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Christopher from D.C Contracting YEG in Edmonton
Date/Time3/30/2017 at 8:35:56 PM

To be honest I don't see why not but regulation may differ between provinces/states.

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Date/Time3/30/2017 at 9:02:33 PM

Yes this would work, thought the air returning would be warmish and thus, warm the water slightly. It would be best to insulate it when installing to reduce a condensation issue.


Impact Plg.

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Date/Time3/30/2017 at 9:51:27 PM

Generally plastic is unsafe in the event of a fire- toxic fumes when using plastic. not sure what the code is exactly in Airdrie but I suggest you give the building permit guys s call, just tell them your thinking about a waterline to the fridge- they be very happy to answer all your questions- right from the book! Codes do vary In municipalities. So it's worth a quick call!

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Date/Time3/31/2017 at 1:27:54 AM

Yes, it's fine to run it in a return air. Just make sure your return air is put back together and sealed up.

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Date/Time3/31/2017 at 12:49:01 PM

Hi Jeff,

as per the other comments. Yes, you can run a line through the cold air return. Insulating that portion of the line would be recommended as well ensuring that the cold air is resealed properly.

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