EN ISO 12499:2008

SLOVENSKI STANDARD
01-april-2009
,QGXVWULMVNLYHQWLODWRUML0HKDQVNDYDUQRVWYHQWLODWRUMHY=DãþLWD,62
Industrial fans - Mechanical safety of fans - Guarding (ISO 12499:1999)
Ventilateurs industriels - Sécurité mécanique des ventilateurs - Protecteurs (ISO
12499:1999)
Ta slovenski standard je istoveten z: EN ISO 12499:2008
ICS:
23.120 =UDþQLNL9HWUQLNL.OLPDWVNH Ventilators. Fans. Air-
QDSUDYH conditioners
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 12499
NORME EUROPÉENNE
EUROPÄISCHE NORM
October 2008
ICS 23.120
English Version
Industrial fans - Mechanical safety of fans - Guarding (ISO
12499:1999)
Ventilateurs industriels - Sécurité mécanique des
ventilateurs - Protecteurs (ISO 12499:1999)
This European Standard was approved by CEN on 2 October 2008.
CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European
Standard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such national
standards may be obtained on application to the CEN Management Centre or to any CEN member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CEN member into its own language and notified to the CEN Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Cyprus, Czech Republic, Denmark, Estonia, Finland,
France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal,
Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION
EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 12499:2008: E
worldwide for CEN national Members.

Contents Page
Foreword.3

Foreword
The text of ISO 12499:1999 has been prepared by Technical Committee ISO/TC 117 “Industrial fans” of the
International Organization for Standardization (ISO) and has been taken over as EN ISO 12499:2008 by
Technical Committee CEN/TC 156 “Ventilation for buildings” the secretariat of which is held by BSI.
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by April 2009, and conflicting national standards shall be withdrawn at the
latest by April 2009.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland and the United Kingdom.
Endorsement notice
The text of ISO 12499:1999 has been approved by CEN as a EN ISO 12499:2008 without any modification.

INTERNATIONAL ISO
STANDARD 12499
First edition
1999-10-15
Industrial fans — Mechanical safety
of fans — Guarding
Ventilateurs industriels — Sécurité mécanique des ventilateurs —
Protecteurs
A
Reference number
ISO 12499:1999(E)
ISO 12499:1999(E)
Contents Page
1 Scope .1
2 Normative references .1
3 Definitions .1
4 Hazards from fans.4
5 Risk assessment.5
6 Reduction of risk.6
7 Types of safeguard.6
8 Guard construction .9
10 Noise .11
11 Fans enclosed within units.11
12 Safe working practices.11
13 Information for use .12
Annex A (informative) Bibliography .13
©  ISO 1999
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means, electronic
or mechanical, including photocopying and microfilm, without permission in writing from the publisher.
International Organization for Standardization
Case postale 56 • CH-1211 Genève 20 • Switzerland
Internet iso@iso.ch
Printed in Switzerland
ii
© ISO
ISO 12499:1999(E)
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.
Draft International Standards adopted by the technical committees are circulated to the member bodies for voting.
Publication as an International Standard requires approval by at least 75 % of the member bodies casting a vote.
International Standard ISO 12499 was prepared by Technical Committee ISO/TC 117 Industrial fans.
Annex A of this International Standard is for information only.
iii
©
ISO
ISO 12499:1999(E)
Introduction
This International Standard is intended to provide designers, users and installers with information on the safety
aspects of fixed guards for use with industrial fans.
Since fans, by the nature of the function they perform, contain rotating parts, they present a mechanical hazard
which has to be minimized or avoided. As a fan does not usually have to be accessible during "normal operation", a
fixed guard can be applied. This can be removed during "ancillary operations" as necessary for servicing or
maintenance.
As the scope of this International Standard covers a particular form of guarding as well as its design and use for a
specific range of products, it is a type C standard, as defined by the European Committee for Standardization.
It complies with ISO/TR 12100-1, ISO/TR 12100-2 and EN 414, as well as ISO 13852.
iv
INTERNATIONAL STANDARD  © ISO ISO 12499:1999(E)
Industrial fans — Mechanical safety of fans — Guarding
1 Scope
This International Standard specifies requirements for the mechanical guarding of industrial fans.
The circumstances under which safety measures shall be taken are described and information on how hazards can
be reduced or eliminated is given, along with guidance on safety practices and information for use.
2 Normative references
The following standards contain provisions which, through reference in this text, constitute provisions of this
International Standard. At the time of publication, the editions indicated were valid. All standards are subject to
revision, and parties to agreements based on this International Standard are encouraged to investigate the
possibility of applying the most recent editions of the standards indicated below. Members of IEC and ISO maintain
registers of currently valid International Standards.
1)
ISO 3864:1984 , Safety colours and safety signs.
2)
ISO 13349: — , Industrial fans — Vocabulary and definitions of categories.
ISO 13852:1996, Safety of machinery — Safety distances to prevent danger zones being reached by the upper
limbs.
2)
ISO 14120: — , Safety of machinery — General requirements for the design and construction of guards (fixed,
movable).
3 Definitions
For the purposes of this International Standard, the definitions given in ISO 13349 and the following definitions
apply.
3.1
industrial fan
any fan used for industrial purposes, including the ventilation of buildings and mines but excluding ceiling, pedestal
and similar circulation type fans such as those commonly used for non- industrial purposes
3.2
normal operation
operation when the fan impeller is rotating and the fan is fulfilling its designed function of moving air
3.3
ancillary operation
operation when the fan impeller is stationary and all power to the fan has been disconnected to allow such activities
as maintenance, cleaning, adjustment or troubleshooting to take place

1)
To be revised, in parts.
2)
To be published.
© ISO
ISO 12499:1999(E)
3.4
windmilling
rotation of a fan impeller induced by flow across the impeller
3.5
hazard
source of possible injury or damage to health
3.6
hazardous situation
any situation in which a person is exposed to a hazard or to hazards
3.7
personal injury
hurt caused to or sustained by a person as a result of mechanical hazard
3.8
risk
combination of the probability and the degree of the possible injury or damage to health in a hazardous situation
3.9
danger zone
danger point
any zone or point at or near the fan where a person is exposed to risk of injury or damage to health
3.10
guard
guarding
mechanical means whereby mechanical hazards associated with industrial fans are minimized or avoided
3.10.1
fixed guard
guard kept in place by means of fasteners, making removal impossible without using tools
3.10.2
fixed distance guard
fixed guard which does not completely enclose a danger zone, but which prevents or reduces access by virtue of its
physical dimensions and its distance from the hazard
3.11
safeguarding
safety measures consisting of the use of specific technical means called safeguards (guards, safety devices) to
protect persons from hazards which cannot reasonably be removed or sufficiently limited by design
3.12
residual risk
risk remaining after specified safety measures have been taken during design or by the application of safeguarding
3.13
safe working practice
system of working which reduces or eliminates the risk of injury
3.14
information for use
safety measures consisting of communication links, such as text, words, signs, signals, symbols or diagrams, used
separately or in combination, to convey information to the user
NOTE Information for use is directed to professional and/or nonprofessional users.
© ISO
ISO 12499:1999(E)
3.15
captive key interlock with timer
combination of a switch, with timer, and a lock secured to a fixed part of the machine with the operating key held
captive in the access door
NOTE The sequence of operation is as follows:
 turn handle to switch off,
 after time delay, further turn to unlock access door, and
 open door (key disengages from lock).
A typical example is illustrated in figure 1.
Key
Lock with switch
�
�  Switch
�  Lock
�  Handle containing key
NOTE The captive key interlock ensures that the circuit-breaking element will be opened before the guard can be opened.
It can be used when the guard can be removed completely. It is less suitable for sliding guards than for hinged and completely
removable ones; it can be combined with a time-delay unit.
Figure 1 — Principle of captive key interlock
© ISO
ISO 12499:1999(E)
4 Hazards from fans
A person may be injured by a fan as a result of:
a) being trapped between a moving and stationary part, e.g. a fan impeller and casing or other fixed part of a fan;
b) being trapped between two moving parts, e.g. a belt and pulley;
c) being drawn into the fan inlet by air movement, resulting in contact with a rotating shaft or impeller;
d) coming into contact with a moving part, such as an impeller;
e) object being drawn into the fan inlet and ejected at high velocity at fan discharge or inlet;
f) structural failure of fan components;
g) contact with surfaces of the fan at extreme temperatures (i.e. less than 220 °C or greater than + 50 °C);
h) noise emission caused by safeguards;
i) even when a fan is switched off, the rotating parts can still be caused to windmill by air driven through the fan,
either naturally or by fan(s) in other parts of the duct system connected to the fan; this could cause injury as the
result of contact w
...