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