Installation of a pressure vacuum breaker inside a building ____________.

The installation of a pressure vacuum breaker inside a building is not allowed because such devices are designed for outdoor use to protect potable water supplies from contamination. According to plumbing codes, pressure vacuum breakers are intended to be installed where there is potential backflow, often in irrigation systems or other outdoor applications where the risk of contamination is greater and there is ample drainage. If installed indoors, there is a higher risk of water accumulation and potential damage to the structure, as well as complications in ensuring compliance with health standards. The presence of indoor plumbing fixtures also presents different cross-connection scenarios that pressure vacuum breakers are not equipped to handle effectively. This underscores the importance of using cross-connection control devices that are appropriate for indoor environments when safeguarding against backflow.