Responding to a request, we are making some of the online Answers and Analysis offered only to IAPMO members available here.
This week's question:
In the UMC: 1. Does the supply air being supplied into a compensating hood need to be shut down when the fire-extinguishing system is discharged? 2. For this same hood, would the 20 percent makeup air being supplied to the room need to be shut down when the fire-extinguishing systems discharges? 3. Would the makeup air on a non-compensating hood need to be shutdown when the fire-extinguishing system discharges?