Why standard PVC pipes are unsuitable for venting gas appliances
In short: Plumbing expert Richard Trethewey explains why using standard PVC for gas appliance ventilation is dangerous. Learn why traditional metal pipes failed and what modern building codes now require to prevent cracks and carbon monoxide poisoning.
Gas appliances produce flue products, including moisture, carbon monoxide, and heat, which must be vented externally to prevent mold or poisoning. While metal pipes were once standard, they often rusted due to moisture buildup, leading to the use of PVC.
However, standard PVC is not designed to withstand the heat from gas appliances and can eventually crack. To ensure safety, current codes mandate that PVC vent pipes and fittings must be rated for venting and originate from the same manufacturer to guarantee a tight fit.
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Sources
- Summary by Intellect · source: Understanding Improvements to PVC Gas Ventilation | Ask This Old House
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