Is the installation of a pressure vacuum breaker inside a building allowed?

The installation of a pressure vacuum breaker inside a building is not allowed due to the potential for adverse effects on the plumbing system and the environment. A pressure vacuum breaker is designed to protect against backflow, primarily when located outdoors or at specific points in irrigation systems. Inside a building, the risk of malfunctioning due to varying pressure conditions or contamination can pose a serious threat to the potable water supply.

Having this device indoors may also impede the air gap necessary for proper function, increasing the risk of siphoning back contaminated water into the clean water system. Thus, the code and regulations typically mandate these devices be installed in external areas or at specific heights to ensure safe and effective operation, preserving indoor air quality and system integrity.