Active vs. Passive Fire Protection: What’s the Difference?

To provide total fire safety, a building requires two distinct layers of defense: Active systems that react to a fire, and Passive systems that are built into the structure to contain it.

Active Fire Protection (AFP)

Active fire protection requires an action or a trigger to work. These systems are designed to detect the fire, alert the occupants, and suppress the flames. Examples include:

Detection: Smoke, heat, and flame sensors.
Alerting: Fire alarms, sirens, and voice evacuation systems.
Suppression: Sprinklers, fire extinguishers, and gas suppression systems.

Passive Fire Protection (PFP)

Passive fire protection is a fundamental part of a building’s structure. It doesn't "do" anything during a fire; rather, it is always present to contain the fire in its area of origin, protecting the building's integrity and clear exit routes. Examples include:

Fire Doors: Specially engineered doors that serve as a barrier to stop the spread of fire and smoke between rooms and corridors for a rated period of time.
Fire Curtains: Flexible, heat-resistant barriers that deploy from the ceiling to create a fire-proof "wall" in large, open-plan areas where standard doors aren't practical.
Fire and Smoke Dampers: Installed within the building's ventilation and ductwork, these mechanical devices close automatically to prevent fire and toxic smoke from traveling through the HVAC system.
Compartmentation & Fire Stopping: This is the practice of dividing a building into "cells" or compartments. Fire Stopping specifically refers to sealing gaps around cables, pipes, and joints in walls or floors to ensure the fire-resistant barrier remains airtight.