The Difference Between Passive and Active Fire Protection

Verus Group • 10 March 2025

If you oversee fire safety in your business or are delving into the various facets of fire safety, you've probably encountered the concepts of 'active' and 'passive' fire protection. But what do these terms actually mean?


Put simply, Active Fire Protection encompasses the detection, control and suppression of fire as an active response, while Passive Fire Protection focuses on constraining a fire to obstruct or hinder its spread. To establish an effective fire safety system, it's essential to have both active and passive fire systems operating collaboratively.


Let's take a look at both in greater detail.


Passive Fire Protection (PFP)  involves the use of structural & fire-resistant materials in conjunction with design features to contain and slow down the spread of fire, smoke, and heat within a building. The primary goal of PFP is to compartmentalise a building into smaller, fire-resistant zones, providing occupants with additional time to evacuate safely, and minimising the amount of property damage caused. Unlike Active Fire Protection (AFP), PFP measures are inherently built into the structure and require minimal to no human intervention during a fire.  Regular inspection and maintenance of PFP systems are crucial to ensure continued effectiveness; consistent upkeep helps maintain compliance with regulations, preserves structural integrity, and guarantees reliable performance during an emergency. Additionally, proper maintenance mitigates liability risks, and ensures PFP systems are promptly adapted following any changes within the building.


Key components of Passive Fire Protection include:


  1. Fire Stopping:  The use of specialist fire-resisting or intumescent materials, such as fire-rated mastic or batt, to seal linear joints or openings that may allow services - such as cables, pipes, conduit, or ducts - to pass through compartment lines, thereby obstructing the passage of fire and smoke. 
  2. Fire Doors: These doors are specially designed to withstand fire & smoke. They form a critical part of a building’s built-in fire protection, helping to maintain compartmentation and protect escape routes and designated safe areas.
  3. Fire-Resistant Walls, Floors, Ceilings and Partitions:  Structural construction materials capable of, or specifically designed to resist the effects of fire and keep it contained within specific areas of the building.
  4. Fire Dampers:  Devices installed in heating, ventilation, and air conditioning (HVAC) systems to prevent the spread of fire and smoke through ducts. They can be either 'fused', or equipped with an actuator which allows integration with a smoke detection system for automated operation.
  5. Intumescent Coatings: Fire-resistant coatings which can be applied to structural elements, such as steel beams and columns. Upon exposure to heat, these coatings expand, providing insulation and delaying the structural element's exposure to high temperatures.
  6. Fire Curtains:  These are fire-resistant barriers designed to limit the spread of fire and smoke. They are typically used in open areas and spaces where traditional walls or floors as a means of compartmentation may be impractical, such as shopping centres, airports, or large loft spaces.


By integrating Passive Fire Protection measures into building design, structures can be better designed to withstand the effects of fire, minimising damage and ensuring a safer environment for occupants. PFP works in conjunction with Active Fire Protection systems to form a comprehensive and effective fire safety strategy.


Active Fire Protection (AFP) refers to the set of systems and equipment designed to detect, suppress, or extinguish fires actively. These measures are proactive in nature and aim to respond swiftly to a fire event, minimising its impact and preventing its escalation. Active fire protection typically involves the use of various technologies and devices, such as fire alarms, sprinkler systems, fire extinguishers, and fire suppression systems.


Key components of active fire protection include but are not limited to:


  1. Fire Alarm Detection Systems:  These systems use sensors to detect the presence of smoke, heat, or flames, triggering alarms to alert occupants and emergency response teams. They can also be integrated with other building systems, such as fire dampers or door hold-open devices, to initiate appropriate responses when needed.
  2. Fire Sprinkler Systems:  These are usually automatically activated when heat is detected, releasing water to control or extinguish the fire.
  3. Fire Suppression Systems: Designed to suppress or extinguish fires in specific areas, such as data centres, kitchens, or industrial environments. Common examples include ANSUL systems, foam fire suppression systems, or dry chemical fire-suppression systems.
  4. Portable Fire Extinguishers: Devices that individuals can use to manually control or extinguish small fires before they escalate. They typically contain firefighting agents like water, foam, dry chemical, or carbon dioxide.
  5. Emergency Smoke Control Systems: Smoke ventilation, including automatic vents, which is designed to manage and clear smoke within a building. This helps to maintain visibility and facilitate safe evacuation.



In summary, passive fire protection is the built-in fire protection which generally forms part of a building's fabric, whereas active fire systems act to intervene rapidly when a fire occurs. Both are intended to limit the spread of fire and provide a safer environment for occupants. These measures are crucial in safeguarding lives and property during a fire emergency.



If your building requires a thorough review of its Passive or Active Fire Protection systems, contact us today to ensure optimal safety and compliance.




Useful Links:

HSE: Active/Passive Fire Protection: https://www.hse.gov.uk/comah/sragtech/techmeasfire.htm

Gov.uk: Fire Safety in the Workplace: https://www.hse.gov.uk/comah/sragtech/techmeasfire.htm

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In the period between 2018 – 2021, there were 1,937 fires at educational premises in the UK, 411 of which were recorded as deliberate. The safety of our children is paramount, and nowhere is this more evident than in our schools. These educational institutions serve as the foundation for our children's future, shaping their lives and providing a nurturing environment for growth and learning. Ensuring the safety of students and staff is a top priority, and one critical aspect of this safety is fire stopping . In this blog, we'll discuss the role of compartmentation in schools, highlight the misuse of materials like PU foam , and explore the significance of fire stopping in safeguarding these educational spaces. Compartmentation: Creating Safe Zones Compartmentation is an essential aspect of fire safety across schools and other educational premises. It involves dividing a building into smaller, fire-tight areas which can withstand flames and heat for a specified period, using a combination of tested systems and construction materials. To demonstrate how this works, we have provided an example floor plan at the end of this article, displaying the fire compartmentation design within a block of flats. The benefits of compartmentation include: Delaying Fire Spread: Compartmentation buys valuable time for occupants to evacuate and for first responders to arrive and contain the fire. Limiting Damage: Fire-resistant compartments prevent fires from spreading to other parts of the building, reducing property damage. Minimising Smoke and Toxic Gas Spread: Effective compartmentation helps keep smoke and toxic gases contained, enhancing the chances of a safe evacuation. Fire Stopping: A Crucial Component of School Safety Fire stopping is a major component in supporting effective compartmentation. It specifically relates to the sealing of openings/penetrations, linear gaps, cavities, and dampers, which may be present in a building where services pass from one compartment to another, at meeting edges of walls or ceilings, or within ventilation ducting. A system of fire-resisting or intumescent materials and devices is used in order to obstruct the spread of fire, smoke and toxic gases throughout a building. It's an indispensable element in school safety and plays a pivotal role in providing sufficient time for evacuation in case of a fire outbreak, whilst also offering first responders a safer environment from which to control the situation and save lives. Effective fire stopping within schools can: Protect Lives: The safety of students, teachers, and staff should always be the top priority in schools. Fire stopping measures are essential for preventing the rapid spread of fire, giving everyone in the building more time to evacuate safely. Reduce Property Damage: Fires in schools can result in substantial and costly property damage. Correctly-installed fire stopping can help contain fires to specific areas, minimizing damage and the subsequent cost of repairs. Ensure Continuity of Education: By preventing the rapid spread of fire, fire stopping measures can help maintain the structural integrity of the building, ensuring that the educational institution can continue to serve its primary purpose: providing education. Misuse of PU Foam - A Potential Hazard: Polyurethane (PU) Foam is a versatile material commonly used for various construction and insulation purposes. However, its misuse in the context of fire stopping can have catastrophic consequences. PU Foam is highly flammable and emits toxic gases when ignited. Some of the potential issues with PU Foam in fire stopping applications include: Rapid Combustion: PU foam can catch fire quickly and propagate intense heat and flames, contributing to the rapid spread of fire within a building. Toxic Fumes: When PU foam burns, it releases toxic gases, including carbon monoxide, which can incapacitate and harm individuals trying to escape a fire. Intense smoke: The production of dense smoke as it ignites can drastically reduce visibility, inhibiting an individual's ability to find a safe exit, as well as causing respiratory difficulties. Ineffective Fire Stopping: When used incorrectly or inappropriately, PU foam can undermine the intended fire stopping measures, making it a poor choice for fire containment. In summary, fire stopping and compartmentation are integral components of a school's fire safety strategy, working together to safeguard the lives of students, teachers, and staff while also protecting the institution itself. The misuse of materials like PU foam can have dire consequences, underscoring the importance of adhering to strict fire safety standards. To ensure the safety of our schools, it's essential for educational institutions to invest in the regular inspection and maintenance of built-in fire safety components, and to educate their staff and students about fire safety procedures. By doing so, we can maintain a secure learning environment that protects our future generation and empowers them to thrive. Schools are legally required to conduct organised and methodical Fire Risk Assessments on an annual basis. In addition, the Responsible Person should consider whether a specific compartmentation and fire stopping survey would be advisable in order to identify any breaches which may have occurred during the school's lifetime. If you have any concerns over any of the topics we have discussed in this blog, or about the educational premises you work in/attend, please do not hesitate to contact us.
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