ISO 21927-7:2017

Overview

ISO 21927-7:2017 - "Smoke and heat control systems - Part 7: Smoke ducts sections" specifies requirements for smoke control duct sections intended to operate in pressure differential systems or smoke and heat exhaust ventilation systems (SHEVS). The standard sets out performance criteria, references applicable test methods, and requires marking and documentation for installation and maintenance. It applies to duct sections and associated components (for example, hangers, turning vanes and silencers) used in buildings for smoke extraction, pressurization and pressure relief. It does not cover natural/powered smoke ventilators or smoke control dampers, nor ducts used for purposes outside smoke and heat control systems.

Key Topics and Requirements

• Scope and use: Duct sections for multi-compartment and single-compartment smoke control systems, including use in pressurization, extraction and inerting fire suppression systems.
• Performance criteria: Fire resistance characteristics such as integrity (E), insulation (I) and leakage are defined for different duct types and must be demonstrated by testing and classification.
• Construction and components: Requirements cover construction, structural supports, sealant materials, penetration seals and other components proven during testing.
• Test methods referenced:
  • Ambient leakage tests
  • Fire resistance tests for integrity and insulation
  • Tests for leakage-rated ducts
• Marking and documentation: Product marking and provision of installation and maintenance information are required to ensure correct field application and ongoing safety.
• Limitations: ISO 21927-7:2017 does not address corrosive effects of process chemicals drawn through the system in detail.

Applications and Users

ISO 21927-7:2017 is primarily used by:

• Fire safety engineers and consultants designing SHEVS, pressurization and smoke extraction systems
• Duct and HVAC manufacturers producing fire-resisting smoke control duct sections
• Specifiers, architects and building services engineers integrating smoke control ducts into building designs
• Test laboratories and certification bodies assessing fire resistance and leakage performance
• Facility managers and installers who rely on the required installation and maintenance documentation

Common application sectors: commercial buildings, shopping centres, hospitals, multi-residential buildings and other premises where controlled smoke extraction or pressurization is required.

Related Standards

• EN 1366-8 / EN 1366-9 - fire resistance tests for smoke extraction ducts
• EN 13501-4 - fire classification of smoke control system components
• ISO 21927 series - complementary parts covering fans, ventilators and system components

By conforming to ISO 21927-7:2017, manufacturers and designers ensure smoke control duct sections meet recognized criteria for fire resistance, leakage control and documented installation - essential for effective smoke and heat control system performance.