Australian building fire safety relies on two fundamentally different types of fire protection working in combination: active systems that detect and respond to fire, and passive systems that contain it. Understanding the distinction is essential for anyone involved in building compliance, design, construction or management.
Active Fire Protection Systems
Active fire protection systems are those that require activation — mechanical, electrical or chemical action — to perform their function. They detect fire, respond to it, and suppress or control it.
- Automatic fire sprinkler systems — activate on heat detection to suppress fire
- Fire detection and alarm systems — detect smoke or heat and alert occupants
- Emergency warning and intercommunication systems (EWIS) — communicate evacuation instructions
- Fire hydrant and hose reel systems — provide water for firefighting
- Gaseous suppression systems — suppress fire in specific high-value areas
- Smoke control systems — manage smoke movement through mechanical ventilation
Passive Fire Protection Systems
Passive fire protection systems are built into the fabric of the building. They require no activation, no power and no human intervention — they simply perform their function by virtue of their construction.
- Fire-rated walls and floors — contain fire within compartments
- Fire doors — maintain compartment integrity at openings
- Penetration seals — seal service openings through fire-rated elements
- Cavity barriers — prevent fire spread through concealed spaces
- Fire-resistant structural elements — maintain structural stability during fire
- Intumescent coatings — provide fire resistance to structural steel
How They Work Together
The BCA requires both passive and active systems to work in combination. Passive compartmentation limits fire spread, buying time for active systems to respond and for occupants to evacuate. Active detection triggers evacuation alarms and may release hold-open fire doors (converting them back to passive compartmentation elements). Sprinklers suppress fire within the compartment where it originates.
Neither system is sufficient alone. Sprinklers without compartmentation allow fire to spread to adjacent areas before activation. Compartmentation without detection leaves occupants unaware of fire until it is advanced. The BCA's performance requirements are designed around their combined operation.
Compliance Obligations
Active and passive systems have different compliance obligations. Active systems are maintained under AS 1851, which specifies inspection frequencies, testing requirements and documentation standards. Passive systems are maintained under AS 1851 Section 17 (fire doors) and AS 4072.1 (penetration seals), and are assessed as part of the annual AFSS process. Both must be included in the building's fire safety schedule and certified in the AFSS.
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