Final answer:
The minimum size of a plumbing exhaust vent depends on fixture units and local plumbing codes. Consult local codes for specific requirements.
Step-by-step explanation:
The minimum size of a plumbing exhaust vent depends on several factors, including the number of fixtures connected to the vent and the distance between the fixtures and the vent. Generally, the minimum size of a plumbing exhaust vent is determined based on the fixture units (F.U.) connected to the vent. For example, a plumbing code may specify that a 2-inch diameter vent can accommodate up to 10 F.U., while a 3-inch diameter vent can accommodate up to 30 F.U.
It is important to note that these minimum sizes are just guidelines, and local plumbing codes may have specific requirements that must be followed. Additionally, the size of the vent may also depend on the type of fixtures being vented. For example, a larger vent may be required for fixtures that produce a significant amount of wastewater, such as toilets or showers.
Overall, it is best to consult local plumbing codes and regulations to determine the specific minimum size requirements for plumbing exhaust vents in a particular area.