A wet 2-inch vent can handle venting for how many fixture unit loads?

A wet vent is a plumbing feature that allows wastewater from one or more fixtures to drain while simultaneously providing venting for those fixtures. The key factor in determining the capacity of a wet vent is how many fixture units it can accommodate.

According to the International Residential Code, a 2-inch wet vent can handle up to four fixture unit loads. This is based on the standard sizing tables found within the code, which evaluate the capacity of vents by their diameter and the number of fixture units being served.

In this case, selecting the number four as the correct answer reflects an understanding of how wet vent capacities are established and the requirements outlined in the code. Each fixture connected to the wet vent contributes a specific number of fixture units, and a 2-inch vent is developed to handle a total of four fixture units combined safely. This makes it essential for ensuring proper drainage and ventilation without causing issues such as siphoning traps or inadequate venting.