What is the function of a building trap in plumbing systems?

The function of a building trap in plumbing systems is primarily to prevent sewer gases from entering the building. Building traps are designed to retain a certain amount of water, which acts as a barrier. This water seal blocks gases that could potentially escape from the sewer system and infiltrate living spaces, ensuring a healthy indoor environment.

The significance of this function is crucial, as sewer gases can be hazardous and unpleasant. They typically contain harmful compounds like methane and hydrogen sulfide, which can pose serious health risks or cause unpleasant odors. By maintaining the water seal, building traps effectively safeguard against these dangers.

In contrast, increasing water pressure, preventing freezing of pipes, and filtering water do not relate to the primary function of a building trap. While each of these aspects is important in plumbing systems, they are addressed through different components and mechanisms within the plumbing infrastructure. Thus, the role of a building trap is specifically centered on ventilation and the sanitary integrity of the plumbing system.