True or False: DWV plumbing prevents foul-smelling, poisoning gases from entering a house.

The statement is true. DWV plumbing refers to drainage, waste, and vent systems, which are essential components of residential and commercial buildings. One of the primary functions of the DWV system is to prevent foul-smelling and potentially harmful gases, such as sewer gases, from entering living spaces.

The venting part of the DWV system allows for the release of gases while also maintaining proper pressure in the drainage system. It ensures that waste can flow freely and prevents the formation of vacuum that could siphon water from traps, which are designed to keep these noxious gases from escaping into the air of the building. Therefore, a properly installed and maintained DWV system is crucial in ensuring indoor air quality and the safety of occupants.

In contrast, other options about only new constructions or commercial buildings limit the applicability of the statement, as DWV systems are critical for all types of buildings, both new and existing, as well as residential and commercial spaces.