In which type of wet venting does the pipe carry both waste and air?

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Vertical wet venting is considered the correct answer because this system is designed to allow a vertical stack to serve as both a waste pipe and a vent. In vertical wet venting, multiple fixtures can be connected to the same vertical pipe, carrying both the waste from the fixtures and providing the necessary venting to ensure proper drainage and prevent siphoning of traps. The vertical orientation allows the waste to flow downward while air can rise within the same pipe, facilitating a balanced flow that helps to maintain drainage efficiency and trap seal integrity.

This method is particularly effective in multi-story buildings where fixtures on different floors can be vented in the same vertical stack. The proper sizing of the pipe is crucial in these systems to avoid issues such as clogging or inadequate venting due to the combined flow of waste and air.

To contrast, in common venting, two fixtures share a vertical venting pipe but do not mix waste and air in the same way as vertical wet venting. Horizontal wet venting does not typically combine waste and air outside of a vertical flow context, while circuit venting involves a different configuration where several fixtures can be vented by a single horizontal pipe, predominantly focusing on the venting of waste flow rather than carrying air and waste together like

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