What is active and passive fire protection?
Active and passive fire protection are two complementary approaches used to reduce the risks and consequences of fire in buildings.
Active fire protection (AFP) includes systems that detect, alert, control or suppress a fire through an automatic or manual response, such as fire alarms, sprinklers and extinguishers. Passive fire protection (PFP) uses fire-resistant construction, compartmentation and other protective systems to limit the spread of fire and smoke and maintain safe conditions for a specified period.
A complete fire safety strategy combines both approaches. Below, we explain how active and passive fire protection work, the main systems used in each category and the key differences between them.
Active vs passive fire protection at a glance
| Active fire protection | Passive fire protection | |
|---|---|---|
| Main purpose | Detect, alert, control or suppress a fire | Limit the spread of fire and smoke |
| How it works | Requires an automatic or manual response | Relies primarily on compartmentation and fire-resistant construction |
| Examples | Fire alarms, sprinklers, extinguishers | Fire doors, fire curtains, firestopping |
| Main role | Respond to a fire | Contain its spread and reduce its consequences |
Both approaches perform different functions, which is why they should not be considered alternatives. Effective fire safety depends on their correct integration within the building.
Active Fire Protection
What is active fire protection?
Active fire protection refers to systems and equipment designed to detect a fire, alert building occupants or emergency services and, in many cases, control or suppress the fire directly.
These systems require some form of activation. This may occur automatically, as with a sprinkler or detection system, or manually, as with a portable fire extinguisher.
Their purpose is to provide an immediate response once a fire has started and help reduce its development and impact.
Types of active fire protection
There are various types of active protection systems, including:
- Water systems: Ideal for large commercial and industrial areas with high fire risk. These systems use water to extinguish or control the fire by cooling materials and removing heat.
- Foam systems: Used where water is insufficient, such as in chemical storage facilities. Foam smothers flammable liquids and blocks vapors from feeding the flames.
- Inert gas systems: Common in server rooms or sensitive areas. These use inert gases like argon or nitrogen to displace oxygen, suffocating the fire without damaging equipment.
Active fire protection systems
These systems vary widely and are designed for specific roles in different environments:
- Fire detection and alarm systems: Include smoke, heat, and flame detectors that trigger alerts to occupants and emergency personnel.
- Automatic sprinklers: Discharge water automatically when a fire is detected.
- Portable fire extinguishers: Handheld devices for suppressing small fires by trained individuals.
- Fire hydrants and hose reels: Manually operated water delivery systems connected to a hydrant network.
Passive Fire Protection
What is passive fire protection?
Active fire protection refers to systems and equipment designed to detect a fire, alert building occupants or emergency services and, in many cases, control or suppress the fire directly.
These systems require some form of activation. This may occur automatically, as with a sprinkler or detection system, or manually, as with a portable fire extinguisher.
Their purpose is to provide an immediate response once a fire has started and help reduce its development and impact.
According to the National Institute of Standards and Technology (NIST), a passive fire protection system is a building or structural component that provides protection from fire or smoke without requiring system activation or movement.
Source: NIST
How does passive fire protection work?
Passive fire protection works primarily by containing fire and smoke and maintaining the integrity of critical building elements for a specified period.
One of its fundamental principles is fire compartmentation, which divides a building into separate areas designed to reduce the possibility of fire and smoke spreading freely from one zone to another.
A correctly designed passive fire protection system can help:
- limit the spread of flames and smoke;
- maintain the fire resistance of walls, floors and structural elements;
- protect escape and evacuation routes;
- reduce the area affected by a fire;
- support firefighting and emergency response measures.
Its effectiveness depends not only on the type of system selected, but also on correct design, installation and maintenance throughout the life of the building.
Types of passive fire protection
Common passive protection strategies include:
- Compartmentation: Divides the building into fire-resistant sections to prevent the spread of fire and smoke between areas.
- Structural protection: Uses special coatings like intumescent paints or fireproof mortars to protect load-bearing elements from collapse.
- Fire retardant treatments: Applied to combustible materials (e.g., wood, textiles) to improve their fire resistance. Can be factory-applied or added onsite.
- Luminescent signage: Ensures visibility of escape routes during low visibility conditions, facilitating safe evacuation.
What are the main passive fire protection systems?
- Fire doors: Automatically close to contain fire and allow safe passage of people and goods.
- Fire curtains: Textile barriers that isolate fire and smoke. Ideal for large open spaces, retractable when not in use.
- Smoke control curtains: Help channel and extract smoke, improving visibility and reducing smoke inhalation during evacuation.
- Penetration seals: Seal openings around pipes and cables that pass through fire-rated walls and floors, preventing spread of fire and smoke.
What role does compartmentation play in passive fire protection?
Fire compartmentation is one of the fundamental principles of passive fire protection.
Its purpose is to divide a building into separate areas capable of limiting the spread of fire and smoke for a specified period. By preventing unrestricted propagation, compartmentation can help protect occupants, evacuation routes and other parts of the building.
An effective compartmentation strategy does not depend on walls and floors alone. All openings, penetrations and discontinuities must also be adequately protected.
This may require the integration of systems such as fire doors, penetration seals and fire curtains.
In buildings where open spaces need to remain unobstructed during normal use, deployable textile systems can provide an effective solution. Fire curtains can remain concealed within the architecture and deploy only when required, helping reconcile fire compartmentation requirements with more flexible building design.
What is the difference between active and passive fire protection?
The main difference between active and passive fire protection lies in the way each approach responds to a fire.
Active fire protection requires an action or activation. A detection system identifies the fire, an alarm warns occupants, a sprinkler releases water or a fire extinguisher is manually operated.
Passive fire protection, by contrast, is primarily designed to contain fire and smoke and maintain the fire resistance of the building.
A passive system does not normally extinguish the fire itself. Instead, it helps limit its consequences and restrict its spread to other parts of the building.
For example, during the same fire:
- a detection system can identify the fire and trigger the alarm;
- sprinklers can help control its development;
- fire-resistant walls can limit its spread;
- a fire curtain can protect an opening within the compartmentation;
- penetration seals can prevent flames and smoke from spreading through service openings.
This illustrates why both forms of protection are complementary.
How do active and passive fire protection systems work together?
A comprehensive fire safety strategy requires the coordinated use of active and passive fire protection systems.
Active systems provide detection, warning and, where appropriate, direct action against the fire. Passive systems help restrict propagation and maintain protected areas within the building.
The combination of both approaches can help provide additional time for evacuation, limit damage to other areas and support emergency response operations.
The specific systems required will depend on factors such as the type of building, its use, occupancy, layout, fire risk and applicable fire safety requirements.
Within passive protection, Tecnitex specializes in textile fire and smoke compartmentation systems designed to integrate into different architectural and technical environments.
Solutions such as fire and smoke curtains can help maintain open and flexible spaces during normal building operation while providing the required protective barrier when activated.
For this reason, the correct integration of active and passive fire protection should be considered from the earliest stages of fire safety planning and building design.
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