What is the minimum diameter for a vent pipe according to Georgia plumbing code?

The minimum diameter for a vent pipe according to the Georgia plumbing code is indeed 1.5 inches. This requirement is based on ensuring adequate airflow and venting capacity in plumbing systems to prevent negative pressure changes that can result in siphoning of traps and the introduction of sewer gases into buildings.

Vent pipes serve the crucial function of allowing air to enter the plumbing system, which helps maintain neutral pressure and ensures that wastewater can flow smoothly. A diameter of 1.5 inches strikes a balance between being sufficiently sized to allow for ventilation while still accommodating space and installation considerations within typical plumbing systems.

Using a diameter smaller than 1.5 inches could lead to inadequate venting, which can cause various plumbing issues, including slow drainage and the potential for sewer gas leaks, thereby compromising the health and safety of the inhabitants.