Overview
ISO 21927-6:2026, published by the International Organization for Standardization (ISO), is a key international standard under the ISO 21927 series focused on smoke and heat control systems, specifically addressing requirements for pressure differential systems (PDS). This standard defines the specifications, characteristics, and test methods for kits and components marketed for use in PDS. These systems are vital for maintaining safe conditions-such as clear escape routes and firefighting access-by controlling airflow and pressure differentials to prevent the spread of smoke into protected spaces during fire incidents.
Adherence to ISO 21927-6 supports building safety, regulatory compliance, and performance consistency for products and installations designed to manage smoke movement via pressurization or depressurization.
Key Topics
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Scope and Purpose
ISO 21927-6 applies to pressure differential systems and their essential components, such as supply fans, control panels, dampers, ducts, and powered exhaust ventilators. The main objective is to specify methods for producing and controlling pressure differentials and airflow that prevent smoke spread.
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Core System Components
Systems typically include:
- Air supply and extraction components (e.g., temperature-rated fans)
- Pressure control devices (barometric or motorized dampers)
- Air release mechanisms
- Smoke control ductwork and dampers
- Control panels, sensors, and activation devices
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Key Performance Characteristics
The standard specifies requirements for:
- Nominal activation conditions and sensitivity
- Response delay and operational reliability
- Effectiveness in smoke/hot gas extraction
- Performance under fire conditions
- Pressurization capability
- Fire resistance (integrity, insulation, smoke leakage, mechanical stability, and maintenance of cross section)
- Durability and maintenance
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Testing and Verification
ISO 21927-6 establishes detailed test methods and criteria for type testing, factory production control (FPC), and verification of PDS performance and reliability, ensuring that installed systems meet the required safety and operational standards.
Applications
Pressure differential systems compliant with ISO 21927-6 have widespread applications in building safety and fire protection, including:
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Escape and Firefighting Routes:
Protecting staircases, lobbies, corridors, and fire-fighting shafts by preventing smoke ingress, ensuring safe evacuation and access for emergency responders.
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High-Rise and Complex Buildings:
Implementing PDS in tall structures or facilities with intricate layouts to manage smoke spread, particularly where compartmentation is integral to fire strategy.
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Critical or Protected Spaces:
Maintaining clear air in areas requiring enhanced protection, such as patient care wards, server rooms, or vital infrastructure zones.
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Regulatory Compliance:
Demonstrating adherence to local, national, and international fire safety codes and regulations that reference ISO standards for smoke control systems.
Utilizing ISO 21927-6 as a compliance basis assures stakeholders-building owners, engineers, contractors, and authorities having jurisdiction-that PDS installations are designed, tested, and maintained to globally recognized performance criteria.
Related Standards
ISO 21927-6 is part of a comprehensive series addressing various aspects of smoke and heat control. Key related standards include:
- ISO 21927-2: Specifications for natural smoke and heat exhaust ventilators
- ISO 21927-3: Specifications for powered smoke and heat exhaust ventilators
- ISO 21927-8: Smoke control dampers
- ISO 13943: Fire safety vocabulary
- ISO/EN 1363-1, 1366-8, 1366-9, 1366-10: Fire resistance test methods for ducts and dampers
- EN 13501-4: Fire classification of construction products and elements used in smoke control
By aligning products and systems with ISO 21927-6 and its companion standards, organizations elevate the resilience and safety of smoke and heat control solutions, crucial for modern building environments.
Open preview (PDF)Smoke and heat control systems — Part 6: Specification for pressure differential systems
