Negative pressure refers to a pressure level that is lower than the atmospheric pressure. In plumbing, negative pressure can occur when water flow creates a vacuum within a pipe, potentially leading to backflow or siphoning, which could introduce contaminants into the potable water supply. To prevent issues associated with negative pressure, devices like backflow preventers, air gap fittings, or vacuum breakers are installed to maintain water safety. Proper management of negative pressure is crucial in water supply, drainage, and ventilation systems to prevent contamination, leaks, or system failures.
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