What is the proper installation requirement for an air gap?

The proper installation requirement for an air gap is that it must be two times the pipe diameter but not less than 1 inch. An air gap serves as a critical measure for preventing backflow and contamination in water systems. By establishing a separation between the water supply and the potential source of contamination, this requirement minimizes the risk of pollutants entering the potable water line.

The two times the pipe diameter rule provides substantial safety, ensuring a significant barrier against any back siphonage that could occur if there is a change in pressure within the plumbing system. Additionally, specifying a minimum distance of 1 inch ensures that smaller diameter pipes are adequately protected, which is especially important in residential settings where various pipe sizes are used.

Meeting these requirements is essential for compliance with health and safety standards and for maintaining the integrity of the water supply system.