What action does NFPA 75 require for IT room ventilation equipment when a clean agent is discharged?

What action does NFPA 75 require for IT room ventilation equipment when a clean agent is discharged?

• A. Ventilation remains on as long as the room is occupied.
• B. Ventilation is not affected by agent discharge.
• C. Ventilation is shut down upon agent discharge.
• D. Ventilation is shut down after 24 hours.

Answer: (C)

When a clean agent is discharged in an IT room protected under NFPA 75, the ventilation system serving that space is shut down. This containment step prevents the agent from being drawn into the building-wide HVAC and spreading to other areas, which could expose occupants and dilute the agent concentration needed to suppress the fire. Keeping ventilation running would undermine containment and could circulate the agent beyond the protected room. Waiting a fixed period, like 24 hours, isn’t a defined action in NFPA 75.

When a clean agent is discharged in an IT room protected under NFPA 75, the ventilation system serving that space is shut down. This containment step prevents the agent from being drawn into the building-wide HVAC and spreading to other areas, which could expose occupants and dilute the agent concentration needed to suppress the fire. Keeping ventilation running would undermine containment and could circulate the agent beyond the protected room. Waiting a fixed period, like 24 hours, isn’t a defined action in NFPA 75.