Code

The Uniform Mechanical Code (UMC) provides an advantage when it comes to venting gas appliances — it incorporates the fuel-gas provisions so that builders and installers don’t have to consult two separate documents. The UMC’s venting provisions correlate with the National Fuel Gas Code (NFPA 54), Zalmie Hussein writes in Plumbing & Mechanical magazine.

“The UMC recognizes that venting systems will be inspected by the local jurisdictions and having the mechanical portion and fuel-gas portion in one document benefits jurisdictions, contractors, installers and homeowners as it saves on costs,” Hussein writes. “Not to mention the provisions in the UMC are extracted directly from NFPA 54 for consistency.”

In the column, Hussein covers general requirements for venting systems and considerations for vent offsets and acceptable slopes, backdraft, termination, and vent sizing. Contractors, builders, and remodelers are always on the lookout for efficient ways to vent gas systems such as tankless water heaters. Check out some of our popular articles on the topic, including “5 venting tankless water heater FAQs“ and “8 facts to know about venting tankless water heaters.”

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