ISO 21927-2:2018
(Main)Smoke and heat control systems — Part 2: Specifications for natural smoke and heat exhaust ventilators
Smoke and heat control systems — Part 2: Specifications for natural smoke and heat exhaust ventilators
This document applies to natural smoke and heat exhaust ventilators (NSHEV) operating as part of smoke and heat exhaust systems (SHEVS), placed on the market. This document specifies requirements and gives test methods for natural smoke and heat exhaust ventilators which are intended to be installed in smoke and heat control systems in buildings.
Systèmes de contrôle de fumée et de chaleur — Partie 2: Spécifications pour les dispositifs d'évacuation naturelle des fumées et de la chaleur
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INTERNATIONAL ISO
STANDARD 21927-2
Second edition
2018-11
Smoke and heat control systems —
Part 2:
Specifications for natural smoke and
heat exhaust ventilators
Systèmes de contrôle de fumée et de chaleur —
Partie 2: Spécifications pour les dispositifs d'évacuation naturelle des
fumées et de la chaleur
Reference number
©
ISO 2018
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 4
5 Requirements . 5
5.1 Nominal activation conditions/sensitivity . 5
5.1.1 Initiation device . 5
5.1.2 Opening mechanism . 6
5.1.3 Inputs and outputs . 6
5.2 Response delay (response time) . 6
5.2.1 Reliability . 6
5.2.2 Opening under (snow/wind) load . 6
5.2.3 Low ambient temperature . 7
5.2.4 Opening under heat . 7
5.3 Operational reliability . 7
5.4 Effectiveness of smoke/hot gas extraction (aerodynamic free area) . 7
5.5 Performance parameters under fire conditions . 7
5.5.1 Resistance to heat . 7
5.5.2 Mechanical stability . 8
5.5.3 Reaction to fire . 8
5.6 Performance under environmental conditions. 8
5.6.1 Opening under load . 8
5.6.2 Low ambient temperature . 8
5.6.3 Stability under wind load . 8
5.6.4 Resistance to wind-induced vibration . 8
5.6.5 Resistance to heat . 8
5.7 Durability . 9
5.7.1 Response delay (response time) . 9
5.7.2 Operational reliability . 9
5.7.3 Performance parameters under fire conditions . 9
6 Testing, assessment and sampling methods. 9
7 Marking, labelling and packaging .10
Annex A (normative) Classification .12
Annex B (normative) Effectiveness of smoke/hot gas extraction (aerodynamic free area) .15
Annex C (normative) Test method for operational reliability and response time .38
Annex D (normative) Test method for opening under load .40
Annex E (normative) Test method for low ambient temperature .42
Annex F (normative) Test method for stability under wind load .43
Annex G (normative) Test method for resistance to heat .45
Annex H (normative) Mounting and fixing conditions for the SBI or small flame tests .56
Annex I (normative) Handling changes affecting declared performances for NSHEV .59
Annex J (informative) Installation and maintenance information .62
Bibliography .63
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 11, Smoke and heat control systems and components.
This second edition cancels and replaces the first edition (ISO 21927-2:2006), which has been technically
revised. It also incorporates the Amendment ISO 21927-2:2006/Amd1: 2010.
The main changes compared to the previous edition are as follows:
— the test apparatus has been amended;
— the whole document has been revised.
A list of all parts in the ISO 21927 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
Introduction
In a fire situation, smoke and heat exhaust ventilation systems create and maintain a smoke free layer
above the floor by removing smoke. They also serve simultaneously to exhaust hot gases released by
a fire in the developing stages. The use of such systems to create smoke-free areas beneath a buoyant
layer has become widespread. Their value in assisting in the evacuation of people from buildings
and other construction works, reducing fire damage and financial loss by preventing smoke damage,
facilitating access for firefighting by improving visibility, reducing roof temperatures and retarding the
lateral spread of fire is firmly established. For these benefits to be obtained, it is essential that natural
smoke and heat exhaust ventilators (referred to in this document as NSHEV) operate fully and reliably
whenever called upon to do so during their installed life. A smoke and heat exhaust ventilation system
(referred to in this document as a SHEVS) is a system of safety equipment intended to perform a positive
role in a fire emergency.
INTERNATIONAL STANDARD ISO 21927-2:2018(E)
Smoke and heat control systems —
Part 2:
Specifications for natural smoke and heat exhaust
ventilators
1 Scope
This document applies to natural smoke and heat exhaust ventilators (NSHEV) operating as part of
smoke and heat exhaust systems (SHEVS), placed on the market. This document specifies requirements
and gives test methods for natural smoke and heat exhaust ventilators which are intended to be
installed in smoke and heat control systems in buildings.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame —
Part 2: Single-flame source test
ISO 21927-9, Smoke and heat control systems — Part 9: Specification for control equipment
ISO 21927-10, Smoke and heat control systems — Part 10: Specification for power output devices
IEC 60584-1, Thermocouples — Part 1: EMF specifications and tolerances
EN 54-5, Fire detection and fire alarm systems — Part 5: Heat detectors — Point detectors
EN 54-7, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors using scattered
light, transmitted light or ionization
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification
using test data from reaction to fire tests
EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to
the thermal attack by a single burning item
3 Terms and definitions
For the purpose
...
INTERNATIONAL ISO
STANDARD 21927-2
Second edition
2018-11
Smoke and heat control systems —
Part 2:
Specifications for natural smoke and
heat exhaust ventilators
Systèmes de contrôle de fumée et de chaleur —
Partie 2: Spécifications pour les dispositifs d'évacuation naturelle des
fumées et de la chaleur
Reference number
©
ISO 2018
© ISO 2018
All rights reserved. Unless otherwise specified, or required in the context of its implementation, no part of this publication may
be reproduced or utilized otherwise in any form or by any means, electronic or mechanical, including photocopying, or posting
on the internet or an intranet, without prior written permission. Permission can be requested from either ISO at the address
below or ISO’s member body in the country of the requester.
ISO copyright office
CP 401 • Ch. de Blandonnet 8
CH-1214 Vernier, Geneva
Phone: +41 22 749 01 11
Fax: +41 22 749 09 47
Email: copyright@iso.org
Website: www.iso.org
Published in Switzerland
ii © ISO 2018 – All rights reserved
Contents Page
Foreword .iv
Introduction .v
1 Scope . 1
2 Normative references . 1
3 Terms and definitions . 1
4 Symbols and abbreviated terms . 4
5 Requirements . 5
5.1 Nominal activation conditions/sensitivity . 5
5.1.1 Initiation device . 5
5.1.2 Opening mechanism . 6
5.1.3 Inputs and outputs . 6
5.2 Response delay (response time) . 6
5.2.1 Reliability . 6
5.2.2 Opening under (snow/wind) load . 6
5.2.3 Low ambient temperature . 7
5.2.4 Opening under heat . 7
5.3 Operational reliability . 7
5.4 Effectiveness of smoke/hot gas extraction (aerodynamic free area) . 7
5.5 Performance parameters under fire conditions . 7
5.5.1 Resistance to heat . 7
5.5.2 Mechanical stability . 8
5.5.3 Reaction to fire . 8
5.6 Performance under environmental conditions. 8
5.6.1 Opening under load . 8
5.6.2 Low ambient temperature . 8
5.6.3 Stability under wind load . 8
5.6.4 Resistance to wind-induced vibration . 8
5.6.5 Resistance to heat . 8
5.7 Durability . 9
5.7.1 Response delay (response time) . 9
5.7.2 Operational reliability . 9
5.7.3 Performance parameters under fire conditions . 9
6 Testing, assessment and sampling methods. 9
7 Marking, labelling and packaging .10
Annex A (normative) Classification .12
Annex B (normative) Effectiveness of smoke/hot gas extraction (aerodynamic free area) .15
Annex C (normative) Test method for operational reliability and response time .38
Annex D (normative) Test method for opening under load .40
Annex E (normative) Test method for low ambient temperature .42
Annex F (normative) Test method for stability under wind load .43
Annex G (normative) Test method for resistance to heat .45
Annex H (normative) Mounting and fixing conditions for the SBI or small flame tests .56
Annex I (normative) Handling changes affecting declared performances for NSHEV .59
Annex J (informative) Installation and maintenance information .62
Bibliography .63
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards
bodies (ISO member bodies). The work of preparing International Standards is normally carried out
through ISO technical committees. Each member body interested in a subject for which a technical
committee has been established has the right to be represented on that committee. International
organizations, governmental and non-governmental, in liaison with ISO, also take part in the work.
ISO collaborates closely with the International Electrotechnical Commission (IEC) on all matters of
electrotechnical standardization.
The procedures used to develop this document and those intended for its further maintenance are
described in the ISO/IEC Directives, Part 1. In particular, the different approval criteria needed for the
different types of ISO documents should be noted. This document was drafted in accordance with the
editorial rules of the ISO/IEC Directives, Part 2 (see www .iso .org/directives).
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. ISO shall not be held responsible for identifying any or all such patent rights. Details of
any patent rights identified during the development of the document will be in the Introduction and/or
on the ISO list of patent declarations received (see www .iso .org/patents).
Any trade name used in this document is information given for the convenience of users and does not
constitute an endorsement.
For an explanation of the voluntary nature of standards, the meaning of ISO specific terms and
expressions related to conformity assessment, as well as information about ISO's adherence to the
World Trade Organization (WTO) principles in the Technical Barriers to Trade (TBT) see www .iso
.org/iso/foreword .html.
This document was prepared by Technical Committee ISO/TC 21, Equipment for fire protection and fire
fighting, Subcommittee SC 11, Smoke and heat control systems and components.
This second edition cancels and replaces the first edition (ISO 21927-2:2006), which has been technically
revised. It also incorporates the Amendment ISO 21927-2:2006/Amd1: 2010.
The main changes compared to the previous edition are as follows:
— the test apparatus has been amended;
— the whole document has been revised.
A list of all parts in the ISO 21927 series can be found on the ISO website.
Any feedback or questions on this document should be directed to the user’s national standards body. A
complete listing of these bodies can be found at www .iso .org/members .html.
iv © ISO 2018 – All rights reserved
Introduction
In a fire situation, smoke and heat exhaust ventilation systems create and maintain a smoke free layer
above the floor by removing smoke. They also serve simultaneously to exhaust hot gases released by
a fire in the developing stages. The use of such systems to create smoke-free areas beneath a buoyant
layer has become widespread. Their value in assisting in the evacuation of people from buildings
and other construction works, reducing fire damage and financial loss by preventing smoke damage,
facilitating access for firefighting by improving visibility, reducing roof temperatures and retarding the
lateral spread of fire is firmly established. For these benefits to be obtained, it is essential that natural
smoke and heat exhaust ventilators (referred to in this document as NSHEV) operate fully and reliably
whenever called upon to do so during their installed life. A smoke and heat exhaust ventilation system
(referred to in this document as a SHEVS) is a system of safety equipment intended to perform a positive
role in a fire emergency.
INTERNATIONAL STANDARD ISO 21927-2:2018(E)
Smoke and heat control systems —
Part 2:
Specifications for natural smoke and heat exhaust
ventilators
1 Scope
This document applies to natural smoke and heat exhaust ventilators (NSHEV) operating as part of
smoke and heat exhaust systems (SHEVS), placed on the market. This document specifies requirements
and gives test methods for natural smoke and heat exhaust ventilators which are intended to be
installed in smoke and heat control systems in buildings.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content
constitutes requirements of this document. For dated references, only the edition cited applies. For
undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 11925-2, Reaction to fire tests — Ignitability of products subjected to direct impingement of flame —
Part 2: Single-flame source test
ISO 21927-9, Smoke and heat control systems — Part 9: Specification for control equipment
ISO 21927-10, Smoke and heat control systems — Part 10: Specification for power output devices
IEC 60584-1, Thermocouples — Part 1: EMF specifications and tolerances
EN 54-5, Fire detection and fire alarm systems — Part 5: Heat detectors — Point detectors
EN 54-7, Fire detection and fire alarm systems — Part 7: Smoke detectors — Point detectors using scattered
light, transmitted light or ionization
EN 13501-1, Fire classification of construction products and building elements — Part 1: Classification
using test data from reaction to fire tests
EN 13823, Reaction to fire tests for building products — Building products excluding floorings exposed to
the thermal attack by a single burning item
3 Terms and definitions
For the purpose
...
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