How far should a plumbing DWV vent termination be horizontally away from a door or window?

The correct answer is 10 feet because plumbing code recognizes the importance of preventing potentially harmful sewer gases from entering living spaces. Vents serve to release gases and equalize pressure in the drainage system, and if they terminate too close to doors or windows, there's a risk that those gases could be drawn inside when doors are opened or windows are opened.

Standing regulations typically require that a plumbing DWV (Drainage, Waste, and Vent) vent must be at least 10 feet horizontally from any opening, such as windows or doors. This distance helps ensure a safer and healthier environment by minimizing the likelihood of sewer odors infiltrating the home.

Maintaining this distance is a crucial aspect of plumbing design to ensure compliance with local building codes and safety standards. Compliance with this requirement not only adheres to the guidelines put forth by institutions like the International Plumbing Code but also promotes effective drainage system performance and overall plumbing health.