Understanding Improvements to PVC Gas Ventilation | Ask This Old House

Ask This Old House plumbing and HVAC expert Richard Trethewey explains why standard PVC should not be used to vent gas appliances and what should be used instead.

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Steps:
1. Gas appliances create flue products which include temperature, carbon monoxide, and sometimes moisture. These need to be vented outside to prevent poisoning (in the case of CO), mold, and mildew.
2. As appliances have become more efficient, traditional venting gave way to direct venting outside. This made venting with metal pipes obsolete, since eventually they would rust due to the moisture buildup.
3. For years, contractors vented flue products with PVC pipes. This is no good because PVC can’t withstand the heat that comes out of gas appliances, so eventually they fail and crack.
4. Code now requires that PVC vent pipes and fittings must come from the same manufacturer (to ensure a tight fit) and they must be rated for venting.

Resources:
Richard demonstrated vent piping from IPEX [https://amzn.to/2MVoFFo].

About Ask This Old House TV:
Homeowners have a virtual truckload of questions for us on smaller projects, and we’re ready to answer. Ask This Old House solves the steady stream of home improvement problems faced by our viewers—and we make house calls! Ask This Old House features some familiar faces from This Old House, including Kevin O’Connor, general contractor Tom Silva, plumbing and heating expert Richard Trethewey, and landscape contractor Roger Cook.

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Keywords:
This Old House, Ask This Old House, DIY, Home Improvement, DIY Ideas, Renovation, Renovation Ideas, How To Fix, How To Install, How To Build, plumbing, Richard Trethewey, Kevin O’Connor, PVC, gas appliances, ventilation

Watch the full episode:
https://www.thisoldhouse.com/watch/cable-railing-painting-shutters-ask-toh

Understanding Improvements to PVC Gas Ventilation | Ask This Old House
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