An automatic air vent is located at the high point in the system and connects to the wet system piping. A pressure relief valve set at 175 psi connects to the line alongside an inspector's test assembly. A main drain ties into the riser piping and routes to an exterior drain point. Pressure gauges and check valves are integrated along the vertical pipe run extending from the main header.
FROM HEADER DRAIN TO EXTERIOR TO WET SYSTEM AUTOMATIC AIR VENT LOCATED AT HIGH POINT IN SYSTEM. INSPECTOR'S TEST MAIN DRAIN PRESSURE RELIEF VALVE (SET AT 175 PSI) 16
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