How far vertically should a stack vent be from a connected drain?

The regulation that a stack vent should be at least 10 feet vertically from a connected drain is important for ensuring proper plumbing system function. This distance minimizes the risk of siphoning action that can occur when drains and vents are too close. If a vent is positioned inadequately, it may fail to properly allow air to flow into the drainage system, leading to the potential for trap siphoning, which would allow sewer gases to enter living spaces, creating both health hazards and unpleasant odors.

Additionally, having a vent that is sufficiently far from the drain helps maintain the pressure balance in the plumbing system. Good venting practices ensure that as wastewater flows down the drain, air can be drawn in, preventing vacuum formation that could disrupt the flow and possibly cause drainage issues. Hence, a vertical distance of at least 10 feet is critical for effective drainage and venting function in a plumbing system.