A back vent is a secondary vent connected to a plumbing fixture in a building’s drainage system. It is designed to maintain proper air pressure within the system, allowing wastewater to flow smoothly and preventing the siphoning of water from traps. The back vent provides an alternate path for air to enter the system, balancing the pressure and ensuring that water seals in traps remain intact. This prevents sewer gases from entering the building through drains. Back vents are particularly important in multi-story buildings where long vertical drainage stacks are used. Proper venting is crucial for the functionality and safety of plumbing systems, ensuring both efficient wastewater removal and protection against sewer gas infiltration.
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