What is the minimum size for an atmospheric vent on a 2" gas pipe?

The minimum size for an atmospheric vent on a 2-inch gas pipe is indeed 2 inches. This is based on established guidelines in the National Fuel Gas Code, which specifies vent sizes to ensure proper functioning and safety of gas appliances.

When determining vent sizes, it is important to maintain adequate airflow and prevent the buildup of harmful gases within the venting system. A vent that is too small can lead to inadequate venting, resulting in potential hazards such as backdrafting and carbon monoxide accumulation. Therefore, using the same diameter for the vent as the gas pipe ensures that sufficient ventilation is provided.

This configuration helps guarantee that combustion byproducts are safely expelled from the building, maintaining both operational efficiency and safety standards.