IEC 60704-2-13:2016

IEC 60704-2-13 ®
Edition 3.0 2016-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-13: Particular requirements for range hoods and other cooking fume
extractors
Appareils électrodomestiques et analogues – Code d'essai pour la détermination
du bruit aérien –
Partie 2-13: Exigences particulières pour les hottes de cuisine et autres
extracteurs de fumée de cuisine

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IEC 60704-2-13 ®
Edition 3.0 2016-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Household and similar electrical appliances – Test code for the determination of

airborne acoustical noise –
Part 2-13: Particular requirements for range hoods and other cooking fume

extractors
Appareils électrodomestiques et analogues – Code d'essai pour la détermination

du bruit aérien –
Partie 2-13: Exigences particulières pour les hottes de cuisine et autres

extracteurs de fumée de cuisine

INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 17.140.20; 97.040.20 ISBN 978-2-8322-3721-2

– 2 – IEC 60704-2-13:2016 © IEC 2016
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope and object . 6
2 Normative references. 7
3 Terms and definitions . 8
4 Measurement methods and acoustical environments . 8
5 Instrumentation . 9
6 Operation and location of appliances under test . 9
7 Measurement of sound power levels . 12
8 Calculation of sound pressure and sound power levels . 12
9 Information to be recorded . 13
10 Information to be reported . 13
Annexes . 16
Annex A (normative) . 16

Figure 101 – Standard load for cooking fume extractors. 14
Figure 102 – Example of standard stand. 14
Figure 103 – Standard load for cooking fume extractors with an external fan . 15

Table 101 – Standard deviations of sound power levels . 7
Table 102 – Standard deviations for declaration and verification . 7

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF AIRBORNE
ACOUSTICAL NOISE –
Part 2-13: Particular requirements for range hoods
and other cooking fume extractors

FOREWORD
1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of IEC is to promote
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patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 60704-2-13 has been prepared by subcommittee 59K:
Performance of household and similar electrical cooking appliances, of IEC technical
committee 59: Performance of household and similar electrical appliances.
This third edition cancels and replaces the second edition published in 2011. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) change of title, scope and definitions 3.103 and 3.104: the standard is dealing with
cooking fume extractors (this covers range hoods and down-draft systems);
b) exhaust pipe of down-draft systems specified;

– 4 – IEC 60704-2-13:2016 © IEC 2016
c) built-in recirculation-air range hoods with an air outlet device specified;
d) Annex AA has been deleted.
The text of this standard is based on the following documents:
CDV Report on voting
59K/272/CDV 59K/283/RVC
Full information on the voting for the approval of this International Standard can be found in
the report on voting indicated in the above table.
This document has been drafted in accordance with the ISO/IEC Directives, Part 2.
This Part 2-13 is intended to be used in conjunction with IEC 60704-1:2010 (3rd edition),
Household and similar electrical appliances – Test code for the determination of airborne
acoustical noise – Part 1: General requirements.
NOTE 1 When “Part 1” is mentioned in this standard, it refers to IEC 60704-1.
This Part 2-13 supplements or modifies the corresponding clauses in IEC 60704-1, so as to
establish the test code for cooking fume extractors. When a particular subclause of Part 1 is
not mentioned in this Part 2-13, that subclause is applicable as far as reasonable. Where this
standard states "addition", "modification" or "replacement", the relevant requirements, test
specifications or explanatory matter in Part 1 are to be adapted accordingly.
Subclauses, tables and figures that are numbered starting from 101 are additional to those in
Part 1. Additional annexes are lettered AA, BB, etc.
Unless notes are in a new subclause or involve notes in Part 1, they are numbered starting
from 101, including those in a replaced clause or subclause.
A list of all parts in the IEC 60704 series, published under the general title Household and
similar electrical appliances – Test code for the determination of airborne acoustical noise,
can be found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "http://webstore.iec.ch" in the data related to
the specific document. At this date, the document will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
INTRODUCTION
The measuring conditions specified in this part of IEC 60704 provide for sufficient accuracy in
determining the noise emitted and comparing the results of measurements taken by different
laboratories, whilst simulating as far as possible the practical use of household range hoods
and other cooking fume extractors.
It is recommended to consider the determination of noise levels as part of a comprehensive
testing procedure covering many aspects of the properties and performance of household
range hoods and other cooking fume extractors.
NOTE As stated in the introduction to IEC 60704-1, this test code is concerned with airborne noise only.

– 6 – IEC 60704-2-13:2016 © IEC 2016
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION OF AIRBORNE
ACOUSTICAL NOISE –
Part 2-13: Particular requirements for range hoods
and other cooking fume extractors

1 Scope and object
This clause of Part 1 is applicable except as follows:
1.1 Scope
1.1.1 General
Addition:
These particular requirements apply to electrical range hoods and other cooking fume
extractors for household and similar use intended for filtering the air of a room or for
exhausting the air out of a room, including their accessories and their component parts. It also
applies to cooking fume extractors with an external fan which may be mounted inside or
outside of the room where the range hood is located or a down-draft system that is arranged
beside, behind or under the cooking surface.
1.1.2 Types of noise
Replacement:
The methods specified in ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring
noise emitted by cooking fume extractors.
1.1.3 Size of source
Replacement:
The method specified in ISO 3744 is applicable to noise sources of any size. When applying
ISO 3743-1 and ISO 3743-2, care should be taken that the maximum size of the cooking fume
extractor under test fulfils the requirements specified in 1.2 of ISO 3743-1 and 1.3 of
ISO 3743-2.
1.2 Object
Addition:
This standard describes the determination of the noise emission of household cooking fume
extractors under normal operating conditions and at the highest fan speed setting for normal
use.
NOTE 101 If a boost position is incorporated, this is not taken into account (see 6.5 of IEC 61591:1997).
NOTE 102 A boost position is a setting of a control for occasional use, which results in a higher temporary fan
speed (see 6.5 of IEC 61591:1997).
Requirements for the declaration of noise emission values are not within the scope of this
standard.
NOTE 103 For determining and verifying noise emission values declared in product specifications, see
IEC 60704-3.
1.3 Measurement uncertainty
Replacement:
The estimated values of standard deviations of sound power levels, determined according to
this standard, are as follows (see Table 101):
Table 101 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
0,4 1,0
Addition:
1.101 Standard deviation for declaration and verification
For the purpose of determining and verifying declared noise emission values according to
IEC 60704-3, the following values apply (see Table 102):
Table 102 – Standard deviations for declaration and verification
Standard deviation (dB)
σ (production) σ (total) σ (reference)
P t M
1,5 to 1,7 1,8 to 2,0 2,0
2 Normative references
This clause of Part 1 is applicable except as follows:
Replacement:
ISO 3743-1:2010, Acoustics – Determination of sound power levels and sound energy levels
of noise sources using sound pressure – Engineering methods for small movable sources in
reverberant fields – Part 1: Comparison method for a hard-walled test room
ISO 3744:2010, Acoustics – Determination of sound power levels and sound energy levels of
noise sources using sound pressure – Engineering methods for an essentially free field over a
reflecting plane
Addition:
IEC 61591:1997, Household range hoods - Methods for measuring performance
IEC 61591:1997/AMD1:2005
IEC 61591:1997/AMD2:2010
ISO 7235:2003, Acoustics – Laboratory measurement procedures for ducted silencers and air-
terminal units – Insertion loss, flow noise and total pressure loss
___________
1 There exists a consolidated edition 1.1 of IEC 61591 (2005), that includes IEC 61591 (1997) and its
amendment 1 (2005).
– 8 – IEC 60704-2-13:2016 © IEC 2016
3 Terms and definitions
This clause of Part 1 is applicable except as follows:
Addition:
3.101
cooking fume extractor
device intended to collect cooking vapours, smells and fumes
Note 1 to entry: The filtered air may be discharged back into the room or away by ducts. Examples are: range
hoods, down-draft systems or range hoods with external fans.
3.102
range hood
appliance installed over a hob and through which air is passed to remove contaminants from
the room
[SOURCE: IEC 61591:1997, 3.1]
3.103
recirculation-air cooking fume extractor
range hood or other cooking fume extractor containing filters to remove contaminants, after
which the cleaned air is discharged back into the room
[SOURCE: IEC 61591:1997, 3.2, modified, – in the term, "range hood" was replaced by
"cooking fume extractor" and " or other cooking fume extractor" was added in the definition.]
3.104
air-extracting cooking fume extractor
range hood or other cooking fume extractor which discharges the collected air to the outside
of the building by means of ducting
Note 1 to entry: The range hood can incorporate an internal or external fan.
[SOURCE: IEC 61591:1997, 3.3, modified – in the term, "range hood" was replaced by
"cooking fume extractor" and " or other cooking fume extractor" was added in the definition ]
3.105
down-draft system
cooking fume extractor intended for installation adjacent to a household cooking range, hob or
similar cooking appliance that draws vapour down into an internal or external exhaust duct
[SOURCE: IEC 61591:1997/AMD2:2010, 3.9]
4 Measurement methods and acoustical environments
This clause of Part 1 is applicable except as follows:
4.2 Direct method
Addition:
NOTE 101 If pure tone components are present in the noise emitted by the source, the estimated standard
deviation of the measured sound pressure levels in the special reverberation room may increase. In such cases
additional microphone positions or source positions may be necessary as specified in ISO 3743-2.

4.3 Comparison method
Addition:
NOTE 101 If pure tone components are present in the noise emitted by the source, the estimated standard
deviation of the measured sound pressure levels in the hard-walled test room or in the special reverberation room
may increase. In such cases additional microphone positions or source positions may be necessary as specified in
ISO 3743-1 or ISO 3743-2.
5 Instrumentation
This clause of Part 1 is applicable except as follows:
5.1 Instrumentation for measuring acoustical data
Addition:
Windscreens should be used if necessary and then corrections for change in the microphone
sensitivity shall be added to the observed sound pressure levels.
6 Operation and location of appliances under test
This clause of Part 1 is applicable except as follows:
6.1 Equipping and pre-conditioning of appliances
6.1.1
Addition:
Recirculation-air cooking fume extractors should be fitted with (a) clean filter(s).
Air-extraction cooking fume extractors shall be fitted with the pipe coupling ring, if any, having
the largest diameter among those provided by the manufacturer. If the cooking fume extractor
is designed to accommodate additional filters, those filters shall be clean and appropriately
fitted.
6.1.3
Replacement:
Prior to noise measurements, the cooking fume extractor shall have been in operation for
running for at least 4 h at the highest speed setting for normal use (see notes in 1.2).
6.1.4
Replacement:
Immediately before each series of noise measurements, the cooking fume extractor equipped
for its intended use is operated to stabilize at the highest speed setting for normal use (see
notes in 1.2) for at least 10 min.
6.2 Supply of electrical energy and of water or gas
6.2.3 and 6.2.4 Not applicable.

– 10 – IEC 60704-2-13:2016 © IEC 2016
6.4 Loading and operating of appliances during test
6.4.2
Replacement:
The appliances shall be equipped according to 6.1.1.
The cooking fume extractor shall be operated at the highest speed setting for normal use
(see notes in 1.2).
Air-extraction cooking fume extractors shall be loaded using a pipe connected to a muffler
according to Figure 101. The pipe shall be rigid with smooth inner walls and shall have the
widest diameter among those specified by the manufacturer. If not stated, a standard pipe
with the best fitting diameter shall be used. The muffler shall have an insertion loss as
specified in the table of Figure 101. It shall have a circular section with the same internal
diameter as that of the pipe, a length as specified in Figure 101 and shall not have parts
protruding inside that may cause additional pressure drops. The pipe and the muffler shall
also comply with all the specifications reported in Figure 101 and care shall be taken that they
do not radiate noise.
Cooking fume extractors with an external fan shall be connected to the fan with a pipe and a
muffler according to Figure 103. The pipe shall be rigid with smooth inner walls and shall have
the widest diameter among those specified by the manufacturer. If not stated, a standard pipe
with the best fitting diameter shall be used. The muffler shall be provided with the appliance.
If the manufacturer did not provide a muffler, the appliance is tested without muffler.
In particular, when connecting the pipe and muffler system to the cooking fume extractor, care
shall be taken that this connection does not transfer any additional structure borne noise. For
this purpose, isolating connecting pieces can be used.
Static forces from the standard load to the cooking fume extractor shall also be avoided.
The fastening of the muffler should not influence the acoustical field in the test room; for
example, two wires could be fixed around the muffler and on the ceiling.
Whenever it is possible to choose among two or more exit holes for the pipe connection, the
one on the upper side of the cooking fume extractor, if any, shall be used.
Cooking fume extractors designed for connection with more than one pipe at the same time
shall be connected accordingly to the number of pipes required.
6.4.3 Not applicable.
6.5 Location and mounting of appliances
6.5.1
Replacement:
Range hoods not intended to be placed against a wall shall be located and mounted
according to 6.5.4.
6.5.2 Not applicable.
6.5.3
Addition:
If the air outlet is located at the rear side of the appliance, an additional 90° bend of the same
type as the standard load shall be used for connection of the appliance to the standard
exhaust system.
Down-craft systems are placed in normal position with a distance of D = 2 × diameter of the
duct + 50 mm between the back of the appliance and a vertical wall or plane, directly, without
any resilient means other than those incorporated in the appliance.
For rectangular air outlets the distance of 25 cm is kept.
6.5.4
Replacement:
Range hoods intended to be placed against a wall, island range hoods and ceiling range
hoods are placed at a distance of D = 1 cm ± 0,5 cm between the back of the appliance and a
vertical wall and supported by a stand with resilient means (an example is given in Figure 102)
• either at a height of 0,6 m from the floor of the hard-walled test room or of the special
reverberation test room with the mentioned distance from one vertical wall and with
a minimum distance of 1 m between any surface (including protruding parts) of the
range hood and the nearest other wall;
• or at a height of 0,6 m on a horizontal reflecting plane in the free field environment
and with the mentioned distance between the back of the range hood and the
vertical reflecting plane. The minimum size of this vertical plane shall be at least
equal to the size of the projection of the measurement surface. The acoustic
absorption coefficient of the vertical reflecting plane shall be smaller than 0,06 in
the frequency range of interest.
Care shall be taken in order to avoid any kind of interference between the supports and the
air intake of the appliance under test.
Care should be taken to avoid any direct contact between the appliance (including protruding
parts, worktops, spacers, etc.) and the vertical reflecting plane.
6.5.5
Addition:
Down-draft systems shall be built-in according to the manufacturer’s installation instructions in
an appropriate test enclosure according to Annex B of Part 1.
Built-in recirculation-air range hoods with an air outlet device separated from the air inlet
device shall be built-in according to the manufacturer’s installation instructions in an
appropriate test enclosure with the same material and thickness defined in Annex B of Part 1.
The bottom of the test enclosure shall be provided with a base shelf of the same material and
thickness as the test enclosure if necessary for mounting the range hood.
If the distance between the air inlet and air outlet device is not defined in the manufacturer’s
installation instructions, a minimum distance of 0,3 m between the outer shapes of the two
devices has to be adhered to. Unless otherwise specified, the opening of the air outlet shall
be adjusted preferably to the floor direction.
Care shall be taken in order to avoid any kind of interference between the supports
(Figure 102), the test enclosure, the air inlet and outlet device and the connecting pipe of the
two devices. Static forces from the supports to the range hood shall also be avoided.
Addition:
– 12 – IEC 60704-2-13:2016 © IEC 2016
6.5.101
For cooking fume extractors with external fan the air inlet device shall be located and
mounted as described in 6.5.1, 6.5.3 or 6.5.4. The external fan shall be located in a way that
the noise emitted by the housing of the fan and by the air outlet does not influence the
measurement result.
7 Measurement of sound power levels
This clause of Part 1 is applicable except as follows:
7.1 Microphone array, measurement surface and RSS location for essentially free-
field conditions over reflecting plane(s)
7.1.1 Not applicable.
7.1.2
Replacement:
For all cooking fume extractors the measurement surface is a parallelepiped with six
microphone positions, as specified in 7.2.4 of ISO 3744 and in Figure 2 of IEC 60704-1.
Additional measurement positions may be required according to 8.1.2 of ISO 3744. The
number of microphone positions may also be reduced according to 8.1.2 of ISO 3744.
While defining the reference box around the appliance, for down-draft systems the suction has
to be extended.
While defining the reference box around the appliance, the standard load connected to a
cooking fume extractor operating in exhausting mode should not be taken into account.
NOTE The x and y axes are located in the vertical reflecting plane, with the x-axis directed vertically upwards and
the front of the appliance directed in the direction of the z-axis. The preferred value of the measurement distance d
is 1 m.
7.1.3 to 7.1.6 Not applicable.
7.4 Measurements
7.4.1
Addition:
The A-weighted time averaged sound pressure level shall be measured over a period of at
least 30 s.
8 Calculation of sound pressure and sound power levels
This clause of Part 1 is applicable except as follows:
8.1 General
Addition:
Noise emitted by the housing or by the air outlet of an external fan shall be considered as
background noise.
9 Information to be recorded
This clause of Part 1 is applicable except as follows:
9.2 Description of appliance under test
9.2.2
Replacement:
Design characteristics: for example chimney, free-standing, island, ceiling, slim line.
9.7 Electric supply, water supply, etc.
9.7.3 and 9.7.4 Not applicable.
9.12 Measurement data
9.12.5 Not applicable.
10 Information to be reported
This clause of Part 1 is applicable except as follows:
10.3 Test conditions for the appliance
10.3.4 and 10.3.5 Not applicable.
10.3.11 Not applicable.
10.4 Acoustical data
10.4.10 Not applicable.
– 14 – IEC 60704-2-13:2016 © IEC 2016
Dimensions in millimetres
l3 l2
1,5 × d
90°
The muffler shall have the same internal diameter as
that of the pipe and shall have at least the insertion
loss reported in the table below
The connections shall not interfere with the air flow
to avoid any additional noise or pressure drop
Pipe with smooth inne
...