How far above any window, door, or opening must a vent terminate?

A vent must terminate at least 3 feet above any window, door, or opening to ensure that exhaust gases do not re-enter the building through these openings. This requirement is crucial for maintaining indoor air quality and preventing harmful fumes from entering living spaces. By situating the termination point of the vent higher than 3 feet from the nearest window or door, it also helps to mitigate issues related to pressure differentials that could potentially draw exhaust back inside. This standard ensures compliance with safety codes and promotes better airflow management within the plumbing system.