Conducted inspection to verify cabinet compliance with IFC 2006, 1805.2.3.5. Pressure monitor and flow switch alarm (item 3.2) and supply valve shut off (item 5) were not tested as the system was in operation and would have disrupted critical processes; accepted several employees' statements attesting it had been tested and verified prior to commissioning and was in their written test records. All other requirements appeared to be in compliance except the "door open" local audible alarm. The sounder was found to be defective. Will follow up at next site visit.