// CODE SNIPPET
1308.7.4 Venting of Line Pressure Regulators
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Line pressure regulators shall comply with all of the following:
- An independent vent to the exterior of the building, sized in accordance with the regulator manufacturer's instructions, shall be provided where the location of a regulator is such that a ruptured diaphragm will cause a hazard. Where more than one regulator is at a location, each regulator shall have a separate vent to the outdoors or, if approved by the Authority Having Jurisdiction, the vent lines shall be permitted to be manifolded in accordance with accepted engineering practices to minimize backpressure in the event of diaphragm failure. Materials for vent piping shall be in accordance with Section 1308.5 through Section 1308.5.11.5.
Exception: A regulator and vent limiting means combination listed as complying with CSA Z21.80 shall be permitted to be used without a vent to the outdoors.
- The vent shall be designed to prevent the entry of water, insects, or other foreign materials that could cause blockage.
- The regulator vent shall terminate at least 3 feet (914 mm) from a source of ignition.
- At locations where regulators might be submerged during floods, a special antiflood-type breather vent fitting shall be installed, or the vent line shall be extended above the height of the expected flood waters.
- A regulator shall not be vented to the appliance flue or exhaust system. [NFPA 54:5.8.5.1]
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