What type of vent is described as a waste pipe that also serves as a vent on the same floor level?

The term that describes a waste pipe which also functions as a vent on the same floor level is a wet vent. In plumbing systems, a wet vent allows multiple fixtures to connect to a single vent line, providing both drainage and venting capabilities. This is particularly useful in situations where space is limited, as it can streamline the plumbing system by reducing the number of pipes required.

In wet venting, the waste pipe carries wastewater while simultaneously allowing air to flow through, preventing pressure buildup and potential siphoning of traps. It is commonly used in multi-fixture installations, such as bathrooms or kitchens, where various plumbing fixtures are grouped together.

Wet vents must adhere to specific regulations and sizing requirements to ensure proper functionality and prevent issues such as odor escape or drain blockages. Understanding the conditions under which a wet vent can be utilized is crucial for successful plumbing design and installation.