ISO 21927-3:2021

Overview

ISO 21927-3:2021 – Smoke and heat control systems – Part 3: Specifications for powered smoke and heat exhaust ventilators sets internationally recognized criteria for the performance, reliability, testing, and marking of powered smoke and heat control ventilators (fans). This standard is intended for manufacturers, specifiers, installers, and regulators involved in fire safety and building ventilation systems. It ensures that powered smoke and heat exhaust ventilators, including impulse/jet fans, meet rigorous operational requirements-contributing to occupant safety and effective fire emergency response in construction works.

Key Topics

• Product Characteristics: The standard specifies mechanical and operational properties for fans designed to exhaust smoke and hot gases during fires, supporting the creation of smoke-free escape routes and firefighter access.
• Testing and Assessment: Comprehensive methodologies are detailed for evaluating response delay, operational reliability, extraction effectiveness, fire resistance, and environmental performance under wind and snow loads.
• Conformance Criteria: Clear benchmarks are provided to determine whether ventilators meet the demands for both ordinary and emergency operation, based on laboratory assessments.
• Fan and Motor Types: Criteria and test methods are established for various configurations, including powered roof ventilators, smoke reservoir ventilators, and impulse/jet fans. The standard addresses different motor installations and the interchangeability of components.
• Marking and Labeling: Specific labeling requirements support traceability, safe installation, and regulatory compliance.

Applications

ISO 21927-3:2021 is essential for:

• Building Safety Design: Smoke and heat exhaust fans compliant with this standard are key components in smoke control systems used in shopping centers, warehouses, car parks, tunnels, and other large or complex buildings.
• Fire Emergency Procedures: The standard ensures that powered ventilators deliver reliable evacuation conditions by rapidly removing smoke and hot gases, maintaining clear escape paths, and aiding fire suppression teams.
• Regulatory Compliance: Adhering to ISO 21927-3:2021 supports fulfillment of fire safety regulations and building codes required by authorities having jurisdiction, increasing building occupier confidence.
• Quality Assurance: Manufacturers utilize the standard’s requirements and testing methods to demonstrate the reliability and performance of their products, as well as to streamline product ranges and optimize testing processes.
• Installation and Maintenance: Guidance provided guarantees correct installation, product selection, and maintenance routines, ultimately sustaining performance throughout the product’s operational life.

Related Standards

To meet all requirements for powered smoke and heat exhaust ventilators, ISO 21927-3:2021 frequently references these standards:

• ISO 834-1: Fire-resistance tests – General requirements for building components.
• IEC 60034-1: Rotating electrical machines – Standardized requirements for rating and performance of motors used in ventilators.
• ISO 5801: Fans – Performance testing using standardized airways.
• EN 13501-4: Fire classification of construction products and building elements, specifically for components used in smoke control systems.

Additional reference documents and cited international standards fortify the comprehensive approach to smoke and heat control ventilation system design, assessment, and operation.

Keywords: ISO 21927-3:2021, powered smoke exhaust ventilators, heat control systems, smoke and heat ventilation, impulse fans, jet fans, fire safety fans, smoke extraction, fan testing, fire resistance ventilators, building emergency ventilation.