A circuit vent serves how many traps at a time?

A circuit vent is specifically designed to serve two or more traps simultaneously. This system allows for efficient venting by connecting multiple traps into a single line, which helps to maintain proper air pressure and facilitate the smooth flow of wastewater. By properly designing the venting system to accommodate multiple traps, it reduces the likelihood of trap siphoning and ensures that wastewater can be effectively drained without causing negative pressure that might pull water out of the traps.

Choosing the option indicating that a circuit vent serves a single trap would not reflect its intended purpose, as a circuit vent is meant to handle multiple traps to optimize plumbing efficiency. Similarly, the option suggesting a circuit vent takes care of all traps in the building or stating it serves none would misinterpret the function of circuit vents within the context of a plumbing system. They are specifically equipped to manage pairs of traps, which is crucial for proper drainage and ventilation in residential and commercial plumbing systems.