How often should plumbing fixtures be vented?

Plumbing fixtures should be vented whenever they are more than 5 feet from a vent stack. This standard is important to ensure that the plumbing system functions effectively. Proper venting is crucial for equalizing pressure in the drainage system, allowing wastewater to flow smoothly without creating suction or pressure build-up that could lead to siphoning of trap seals. Venting also helps prevent foul odors from escaping into living areas by allowing sewer gases to be safely exhausted outside.

The 5-foot distance requirement establishes a guideline to ensure that all plumbing fixtures maintain adequate ventilation to function properly. When fixtures are located beyond this distance, the risk of drainage issues increases, requiring venting to provide a clear path for air to enter the drainage system and facilitate proper wastewater flow. This helps minimize potential problems such as slow drains, gurgling sounds, or even backflows.

Venting should be planned during the installation of plumbing systems and not only addressed during construction, as maintaining proper venting is essential for ongoing system performance.