ISO 21927-5:2018 PDF

Smoke and heat control systems — Part 5: Powered smoke exhaust systems — Requirements and design

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Title (English):

ISO 21927-5:2018

Smoke and heat control systems — Part 5: Powered smoke exhaust systems — Requirements and design

Document status:: Withdrawn
Format:: Electronic (PDF)
Number of pages:: 14
Publication date:: November 28, 2018
Edition:: ISO IS 21927 edition 1 version 1
ICS:: 13.220.20

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Description (English):

This document applies to powered smoke exhaust systems in spaces with a large area and with a ceiling height of minimum 3 m, in which smoke protection is required. It includes tables and calculation methods for the design of clear layers in order to comply, inter alia, with the requirements of various protection objectives. This document includes information and provisions concerning the requirements for powered smoke exhaust systems, their design and rules for their installation. NOTE The requirements for testing the ventilators are dealt with in ISO 21927‑3. Other parts of the ISO 21927 series of standards deal with the power supply (ISO 21927‑10), control equipment (ISO 21927‑9) and smoke control ducts and smoke control dampers (ISO 21927‑7 and ISO 21927-8 respectively). Design, as specified in this document, does not apply to: — spaces with fixed gas extinguishing systems; — storage facilities for hazardous materials; — spaces in which there is a risk of explosions; — corridors; — stairwells.

Technical details

Technical committee: ISO/TC 21/SC 11 - Smoke and heat control systems and components
SKU: ISO 21927-5:2018

Abstract

Overview

ISO 21927-5:2018 - "Smoke and heat control systems - Part 5: Powered smoke exhaust systems - Requirements and design" sets out requirements and design rules for powered smoke exhaust systems used to create and maintain a clear layer beneath a buoyant smoke layer in large spaces. The standard applies to spaces with a minimum ceiling height of 3 m where smoke protection is required, and it provides tables and calculation methods for designing clear layers to meet protection objectives. It also covers installation rules and system design assumptions (e.g., activation timing, air supply considerations). Certain spaces are excluded (see Key Topics).

Key topics and technical requirements

Scope and exclusions: Applies to large-area spaces (ceiling ≥ 3 m). Design does not apply to spaces with fixed gas extinguishing systems, hazardous storage, explosion-risk areas, corridors or stairwells.
Clear layer design: Defines the clear layer (distance from floor to smoke layer lower surface) with a minimum target height of 2.5 m; higher values may be required depending on occupancy or protected objects.
Smoke reservoirs and barriers: Spaces must be divided into smoke reservoirs (maximum area guidance provided) using smoke barriers; maximum distance between barriers is 60 m.
Air supply: Requires an immediate and sufficient replacement air supply near floor level when the system is activated; design limits include avoiding turbulence (replacement air velocity not greater than 1 m/s at the inlet point).
Design assumptions: Typical design assumes early activation (automatic/manual), solid-fuel fires, a mean fire propagation rate around 10 minutes, and constraints on design fire area and smoke temperatures.
Components and installation rules: Covers placement and types of ventilators (roof-, wall- or centrally mounted), smoke control ducts and dampers, and installation rules for reliable operation.
Associated component standards: Ventilator testing, power supply and control equipment are covered in other parts of ISO 21927.

Practical applications

ISO 21927-5 is intended for use in the design and installation of smoke and heat exhaust ventilation systems (SHEVS) in large indoor environments, including:

Warehouses and logistics hubs
Shopping centres, exhibition halls and arenas
Industrial production halls and large retail spaces The standard supports fire safety objectives such as enabling safe evacuation, improving firefighting access, limiting smoke spread, and protecting property and structure from heat and smoke damage.

Who uses this standard

Fire safety engineers and smoke control designers
HVAC and building services engineers
Architects and structural designers specifying fire protection
Contractors installing smoke exhaust systems
Authorities having jurisdiction and code officials reviewing designs

Related standards

ISO 21927-3 (ventilator specification/testing)
ISO 21927-7 (smoke control ducts)
ISO 21927-8 (smoke control dampers)
ISO 21927-9 (control equipment)
ISO 21927-10 (power supply)

Keywords: ISO 21927-5:2018, powered smoke exhaust systems, smoke and heat control, clear layer design, smoke reservoirs, smoke barriers, ventilators, smoke control ducts, SHEVS, fire safety design.

Related standards

Standards mentioned in the description

Abstract

Overview

Key topics and technical requirements

Scope and exclusions: Applies to large-area spaces (ceiling ≥ 3 m). Design does not apply to spaces with fixed gas extinguishing systems, hazardous storage, explosion-risk areas, corridors or stairwells.
Clear layer design: Defines the clear layer (distance from floor to smoke layer lower surface) with a minimum target height of 2.5 m; higher values may be required depending on occupancy or protected objects.
Smoke reservoirs and barriers: Spaces must be divided into smoke reservoirs (maximum area guidance provided) using smoke barriers; maximum distance between barriers is 60 m.
Air supply: Requires an immediate and sufficient replacement air supply near floor level when the system is activated; design limits include avoiding turbulence (replacement air velocity not greater than 1 m/s at the inlet point).
Design assumptions: Typical design assumes early activation (automatic/manual), solid-fuel fires, a mean fire propagation rate around 10 minutes, and constraints on design fire area and smoke temperatures.
Components and installation rules: Covers placement and types of ventilators (roof-, wall- or centrally mounted), smoke control ducts and dampers, and installation rules for reliable operation.
Associated component standards: Ventilator testing, power supply and control equipment are covered in other parts of ISO 21927.

Practical applications

ISO 21927-5 is intended for use in the design and installation of smoke and heat exhaust ventilation systems (SHEVS) in large indoor environments, including:

Warehouses and logistics hubs
Shopping centres, exhibition halls and arenas
Industrial production halls and large retail spaces The standard supports fire safety objectives such as enabling safe evacuation, improving firefighting access, limiting smoke spread, and protecting property and structure from heat and smoke damage.

Who uses this standard

Fire safety engineers and smoke control designers
HVAC and building services engineers
Architects and structural designers specifying fire protection
Contractors installing smoke exhaust systems
Authorities having jurisdiction and code officials reviewing designs

Related standards

ISO 21927-3 (ventilator specification/testing)
ISO 21927-7 (smoke control ducts)
ISO 21927-8 (smoke control dampers)
ISO 21927-9 (control equipment)
ISO 21927-10 (power supply)

Keywords: ISO 21927-5:2018, powered smoke exhaust systems, smoke and heat control, clear layer design, smoke reservoirs, smoke barriers, ventilators, smoke control ducts, SHEVS, fire safety design.

ISO 21927-5:2018 PDF

Technical details

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Related standards

Abstract

Overview

Key topics and technical requirements

Practical applications

Who uses this standard

Related standards

Related standards

Smoke and heat control systems — Part 2: Specification for natural smoke and heat exhaust ventilators — Amend…

Smoke and heat control systems — Part 3: Specification for powered smoke and heat exhaust ventilators — Amend…

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