DC Plumber Practice Questions - District Of Columbia Journeyman Plumber License Exam

Per the IPC, at what height above the finished floor must an air admittance valve (AAV) be installed?

At least 4 inches above the horizontal branch drain At least 4 inches above the flood level rim of the highest fixture served At least 6 inches above the highest fixture served At or above the flood level rim of the highest fixture served

Correct Answer:

At least 4 inches above the horizontal branch drain

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