An atmospheric vacuum breaker must be installed how many inches above the highest water outlet?

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Multiple Choice

An atmospheric vacuum breaker must be installed how many inches above the highest water outlet?

Explanation:
An atmospheric vacuum breaker works by venting to the atmosphere to break any siphon in the line, so it must be kept high enough above the highest downstream outlet to ensure a potential vacuum cannot pull water back into the supply. The required clearance is six inches above the highest water outlet. This distance provides a reliable air gap so back-siphonage cannot occur if pressure drops or the line is used by other outlets.

An atmospheric vacuum breaker works by venting to the atmosphere to break any siphon in the line, so it must be kept high enough above the highest downstream outlet to ensure a potential vacuum cannot pull water back into the supply. The required clearance is six inches above the highest water outlet. This distance provides a reliable air gap so back-siphonage cannot occur if pressure drops or the line is used by other outlets.

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