How should HVAC controls coordinate with fire and life safety systems?

How should HVAC controls coordinate with fire and life safety systems?

• A. Interlock dampers and fans, shut down or isolate HVAC as required, maintain pressurization of egress paths, and coordinate with smoke control.
• B. Ignore fire safety to minimize nuisance alarms.
• C. Only shut down HVAC when a fire alarm is active; otherwise operate normally.
• D. Increase air movement in exit corridors during a fire.

Answer: (A)

Coordinating HVAC with fire and life safety is about keeping air from helping the fire and keeping occupants safe as they evacuate. When a fire is detected, the air systems should interlock with the fire safety controls so that air movement is contained to the fire zone and does not push smoke into other areas. The HVAC equipment can be shut down or isolated as required, or placed into a smoke-control mode that works with the building’s smoke management strategy. Egress paths, like stairwells and corridors, are kept at a higher pressure to prevent smoke from entering them, helping occupants breathe more easily and see better while exiting. The smoke-control system and HVAC then coordinate to exhaust smoke from occupied spaces and remove it from the building, rather than distributing it. This approach prevents spreading smoke, preserves tenable spaces along evacuation routes, and aligns with life-safety objectives. Ignoring fire safety, acting only when a fire alarm is active without a coordinated response, or increasing air movement in exit corridors during a fire would worsen conditions and endanger occupants.

Coordinating HVAC with fire and life safety is about keeping air from helping the fire and keeping occupants safe as they evacuate. When a fire is detected, the air systems should interlock with the fire safety controls so that air movement is contained to the fire zone and does not push smoke into other areas. The HVAC equipment can be shut down or isolated as required, or placed into a smoke-control mode that works with the building’s smoke management strategy. Egress paths, like stairwells and corridors, are kept at a higher pressure to prevent smoke from entering them, helping occupants breathe more easily and see better while exiting. The smoke-control system and HVAC then coordinate to exhaust smoke from occupied spaces and remove it from the building, rather than distributing it.

This approach prevents spreading smoke, preserves tenable spaces along evacuation routes, and aligns with life-safety objectives. Ignoring fire safety, acting only when a fire alarm is active without a coordinated response, or increasing air movement in exit corridors during a fire would worsen conditions and endanger occupants.