IEC 60704-2-7:2026

• Abstract:

  IEC 60704-2-7:2026 applies to electrical fans (including their accessories and their component parts) for household and similar use, designed for AC or DC supply.; The motor, the impeller and their housing, if any, form a single unit.; These particular requirements apply to:; – comfort fans (conventional and bladeless),; – table fans,; – pedestal fans,; – ceiling fans,; – wall bracket fans,; – ceiling bracket fans,; – louvre fans,; – tower fans,; – handheld fans,; – neckband fans,; – embedded fans,; – ventilating fans.; This document does not apply to:; – fans that are part of a central ventilation system,; – fans that are part of an appliance (for example cooling fans),; – fans with additional functions (for example heating, humidifying).; This third edition cancels and replaces the second edition published in 2020. This edition constitutes a technical revision.; This edition includes the following significant technical changes with respect to the previous edition:; a) alignment with IEC 60704-1:2021;; b) scope has been expanded to handheld, neckband and embedded fans;; c) positioning and mounting have been reworked;; d) test concept of partition ventilating fans has changed to measure both inlet and outlet side together.; This Part 2-7 is to be used in conjunction with IEC 60704-1:2021, Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 1: General requirements.

• Status: Published
• Publication Date: 02-Nov-2026
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 23.120 - Ventilators. Fans. Air-conditioners
• Technical Committee: SC 59L - Small household appliances
• Drafting Committee: JWG 2 - TC 59/JWG 2
• Current Stage: PPUB - Publication issued
• Start Date: 03-Nov-2026
• Completion Date: 20-Nov-2026

• Revises: IEC 60704-2-7:2020 - Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-7: Particular requirements for fans
• Effective Date: 13-Dec-2024

IEC 60704-2-7 ®
Edition 3.0 2026-11
INTERNATIONAL
STANDARD
EXTENDED VERSION
This full version of IEC 60704-2-7:2026 includes the content of the references made to
IEC 60704-1:2021
Household and similar electrical appliances - Test code for the determination of
airborne acoustical noise -
Part 2-7: Particular requirements for fans
ICS 17.140.20; 23.120 ISBN 978-2-8327-1602-1

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CONTENTS
FOREWORD . 3
INTRODUCTION to IEC 60704-1:2021 . 6
INTRODUCTION to IEC 60704-2-7:2026 . 6
1 Scope . 7
2 Normative references . 8
3 Terms and definitions . 8
4 Measurement methods and acoustical environments . 10
4.1 General . 10
4.2 Direct method . 11
4.3 Comparison method . 11
4.4 Acoustical environments . 12
4.4.1 General requirements and criterion for adequacy of the test
environment . 12
4.4.2 Criterion for background noise level . 12
4.4.3 Environmental conditions . 12
4.5 Measurement uncertainties . 12
4.5.1 General . 12
4.5.2 Standard deviations on repeatability and reproducibility and standard
deviations related to declaration and verification . 13
5 Instrumentation. 13
5.1 Instrumentation for measuring acoustical data . 13
5.2 Instrumentation for measuring climatic conditions . 14
5.3 Instrumentation for measuring operating conditions . 14
6 Operation and location of appliances under test . 14
6.1 Equipping and pre-conditioning of appliances . 14
6.2 Supply of electric energy and of water or gas . 14
6.3 Climatic conditions . 15
6.4 Loading and operating of appliances during tests . 15
6.5 Location and mounting of appliances . 16
7 Measurement of sound pressure levels . 17
7.1 Microphone array, measurement surface and RSS location for essentially
free field conditions over reflecting plane(s) . 17
7.2 Microphone array and RSS location in hard-walled test rooms . 21
7.3 Microphone array and RSS location in special reverberation test rooms . 21
7.4 Measurements . 22
8 Calculation of sound pressure and sound power levels . 23
8.1 General . 23
8.2 Corrections for background noise levels . 23
8.3 Corrections for the test environment . 23
8.4 Calculation of sound pressure level averaged over the microphone positions . 24
8.5 Calculation of sound power levels with the comparison method . 24
8.6 Calculation of sound power levels in free field conditions over a reflecting
plane . 25
8.7 Calculation of A-weighted sound power level with the direct method in
special reverberation test rooms . 25
9 Information to be recorded . 25
9.1 General data . 25
9.2 Description of appliance under test . 26
9.3 Measurement method . 26
9.4 Acoustical test environment . 26
9.5 Instrumentation . 26
9.6 Equipment and pre-conditioning of appliance under test . 27
9.7 Electric supply, water supply, etc. . 27
9.8 Climatic conditions . 27
9.9 Operation of the appliance under test . 27
9.10 Location and mounting of the appliance under test . 27
9.11 Microphone array . 27
9.12 Measurement data . 28
9.13 Calculated sound pressure and sound power levels . 28
9.14 Reporting . 28
10 Information to be reported . 28
10.1 General data . 28
10.2 Appliance under test . 28
10.3 Test conditions for the appliance. 29
10.4 Acoustical data . 29
Annex A (normative) Standard test table . 30
Annex B (normative) Not applicable . 31
Annex C (informative) Guidelines for the design of simple test rooms with essentially
free field conditions . 32
Bibliography . 33

Figure 1 – Measurement surface – parallelepiped – with key microphone positions, for
floor free-standing appliances . 18
Figure 4 – Measurement surface – hemisphere – with key microphone positions, for
hand-held, table type and floor-treatment appliances . 19
Figure 101 – Measurement surface – hemisphere – with 10 microphone positions, for
wall bracket fans . 21
Figure A.1 – Example of standard test table . 30

Table 1 – Standard deviations of sound power levels . 13
Table 2 – Standard deviations for declaration and verification . 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
Household and similar electrical appliances -
Test code for the determination of airborne acoustical noise -
Part 2-7: Particular requirements for fans

FOREWORD
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This extended version (EXV) of the official IEC Standard provides the user with the full
content of the Standard.
IEC 60704-1:2021.
The specific content of IEC 60704-2-7:2026 is displayed on a blue background.

IEC 60704-2-7 has been prepared by subcommittee 59L: Small household appliances, of IEC
technical committee 59: Performance of household and similar electrical appliances. It is an
International Standard.
This third edition cancels and replaces the second edition published in 2020. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60704-1:2021;
b) scope has been expanded to handheld, neckband and embedded fans;
c) positioning and mounting have been reworked;
d) test concept of partition ventilating fans has changed to measure both inlet and outlet side
together.
The text of this International Standard is based on the following documents:
Draft Report on voting
59L/322/FDIS 59L/324/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement,
available at www.iec.ch/members_experts/refdocs. The main document types developed by
IEC are described in greater detail at www.iec.ch/publications.
This Part 2-7 is to be used in conjunction with IEC 60704-1:2021, Household and similar
electrical appliances - Test code for the determination of airborne acoustical noise - Part 1:
General requirements.
The relevant text of IEC 60704-1:2021 as amended by this standard establishes the test code
for fans.
This Part 2-7 supplements or modifies the corresponding clauses in IEC 60704-1:2021, so as
to establish the test code for fans. When a particular subclause of IEC 60704-1:2021 is not
mentioned in this Part 2-7, 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 IEC 60704-1:2021 shall be adapted accordingly.
Subclauses, tables and figures that are numbered starting from 101 are additional to those in
IEC 60704-1:2021.
Unless notes are in a new subclause or involve notes in IEC 60704-1:2021, they are
numbered starting from 101, including those in a replaced clause or subclause.
Additional annexes are lettered AA, BB, etc.
In this standard, the following print types are used:
– terms defined in Clause 3: bold type.
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 webstore.iec.ch in the data related to the
specific document. At this date, the document will be
– reconfirmed,
– withdrawn, or
– revised.
INTRODUCTION to IEC 60704-1:2021
Although the noise emitted by household appliances does not generally present a hazard to
the hearing of the operator and other exposed persons, the need for standardization
procedures for the determination of the noise emitted has been recognized for a long time.
Such procedures should be specified, not only for special types of appliances, but also the
principles should be applicable to the majority of appliances in general use.
Generally, the determination of noise levels is only part of a comprehensive testing procedure
covering many aspects of the properties and performances of the appliance. It is therefore
important that the requirements for noise measurements (such as test environment,
instrumentation, and amount of labour involved) be kept at a modest level.
The results of noise measurements are used for many purposes, for example for noise
declaration, as well as for comparing the noise emitted by a specific appliance to the noise
emitted by other appliances of the same family. In other cases, the results are taken as a
basis for engineering action in the development stages of new pieces of equipment, or in
deciding on means for sound insulation. For all purposes, it is important to specify procedures
with known accuracy so that the results of measurements taken by different laboratories can
be compared.
These conditions have, as far as possible, been taken into account in the preparation of this
test code. The acoustic measuring methods are based on those described in
ISO 3743‑1:2010, ISO 3743-2:2018 and ISO 3744:2010.
The adoption of these methods permits the use of hemi-anechoic rooms, special reverberation
test rooms and hard-walled test rooms. The result of the measurements is the sound power
level of the appliance. Within the measuring uncertainty specific to these methods, the results
from the determination under free field conditions over a reflecting plane are equal to those
obtained in reverberant fields.
The use of intensity methods as described in ISO 9614-1:1993, ISO 9614-2:1996, and
ISO 9614-3:2002 is applicable under special conditions, which are described in specific parts
of the IEC 60704-2 series.
This test code is concerned with airborne noise only. In some cases, structure-borne noise,
for example transmitted to the adjoining room, can be of importance.
INTRODUCTION to IEC 60704-2-7:2026
The measuring conditions specified in this document provide for sufficient accuracy in
determining the noise emitted and the comparison of the results of measurements taken by
different laboratories, whilst simulating as far as possible the practical use of household fans.
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
fans.
NOTE As stated in the introduction to IEC 60704-1, this test code is concerned with airborne noise only.

1 Scope
This part of IEC 60704 applies to electric appliances (including their accessories or
components) for household and similar use, supplied from mains or from batteries.
By "similar use" is understood the use in conditions similar to those found in households, for
example in inns, coffee houses, tea rooms, hotels, barber or hairdresser shops, launderettes,
etc., if not otherwise specified in the IEC 60704-2 series.
This document does not apply to
– appliances, equipment, or machines designed exclusively for industrial or professional
purposes;
– appliances that are integrated parts of a building or its installations, such as equipment for
air conditioning, heating and ventilating (except household fans, cooker hoods, free-
standing heating appliances, dehumidifiers, air cleaners, and stand-alone water heaters),
oil burners for central heating, pumps for water supply and for sewage systems;
– separate motors or generators and
– appliances exclusively for outdoor use.
For determining and verifying noise emission values declared in product specifications, see
IEC 60704-3:2019.
This part of IEC 60704 applies to electrical fans (including their accessories and their
component parts) for household and similar use, designed for AC or DC supply.
The motor, the impeller and their housing, if any, form a single unit.
These particular requirements apply to:
– comfort fans (conventional and bladeless),
– table fans,
– pedestal fans,
– ceiling fans,
– wall bracket fans,
– ceiling bracket fans,
– louvre fans,
– tower fans,
– handheld fans,
– neckband fans,
– embedded fans,
– ventilating fans.
This document does not apply to:
– fans that are part of a central ventilation system,
– fans that are part of an appliance (for example cooling fans),
– fans with additional functions (for example heating, humidifying).
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.
IEC 60704-2 (all parts), Household and similar electrical appliances – Test code for the
determination of airborne acoustical noise
IEC 60704-3:2019, Household and similar electrical appliances – Test code for the
determination of airborne acoustical noise – Part 3: Procedure for determining and verifying
declared noise emission values
IEC 61260-1:2014, Electroacoustics – Octave-band and fractional-octave-band filters – Part
1: Specifications
IEC 61672-1:2013, Electroacoustics – Sound level meters – Part 1: Specifications
ISO 3743-1:2010, Acoustics – Determination of sound power levels of noise sources –
Engineering methods for small, movable sources in reverberant fields – Part 1: Comparison
method for hard-walled test rooms
ISO 3743-2:2018, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering methods for small, movable sources in reverberant fields –
Part 2: Methods for special reverberation test rooms
ISO 3744:2010, Acoustics – Determination of sound power levels of noise sources using
sound pressure – Engineering method in an essentially free field over a reflecting plane
ISO 9614-1:1993, Acoustics – Determination of sound power levels of noise sources using
sound intensity – Part 1: Measurement at discrete points
ISO 9614-2:1996, Acoustics – Determination of sound power levels of noise sources using
sound intensity – Part 2: Measurement by scanning
ISO 9614-3:2002, Acoustics – Determination of sound power levels of noise sources using
sound intensity – Part 3: Precision method for measurement by scanning
ISO 6926:2016, Acoustics – Requirements for the performance and calibration of reference
sound sources used for the determination of sound power levels
ISO 12001:1996, Acoustics – Noise emitted by machinery and equipment – Rules for the
drafting and presentation of a noise test code
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply. Terms and
definitions pertinent to the determination of sound power levels can be found in ISO 3743-
1:2010, ISO 3743-2:2018 and ISO 3744:2010.
ISO and IEC maintain terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
measurement time interval
portion or a multiple of an operational period or operational cycle for which the sound power
levels are determined
3.2
operational period
interval of time during which a specified process is accomplished by the appliance under test
(for example, washing or rinsing or drying for a dishwasher)
3.3
operational cycle
specific sequence of operational periods occurring while the appliance under test performs a
complete work cycle
Note 1 to entry: During the operational cycle, each operational period is associated with a specific process that
can occur only once, or can be repeated (for example, washing and rinsing and drying for a dishwasher).
3.4
time history
continuous recording of the sound pressure level (for a distinct microphone position) as a
function of time, which is obtained during one or more operational periods of an operational
cycle
3.5
reference box
hypothetical right parallelepiped terminating on the reflecting plane(s) on which the noise
source under test is located, that just encloses the source including all the significant sound
radiating components and any test table on which the source is mounted
[SOURCE: ISO 3744:2010, 3.10, modified – The note has been omitted.]
3.6
test enclosure
enclosure used for simulating the typical acoustic built-in or/and mounting conditions
3.101
comfort fan
fan primarily designed for creating air movement around or on part of a human body for
personal cooling comfort, including fans that can perform additional functionalities such as
lighting
[SOURCE: IEC 60879:2019, 3.1, modified - Note to entry has been deleted.]
3.102
wall bracket fan
comfort fan for mounting on the wall
[SOURCE: IEC 60879:2019, 3.8]
3.103
ceiling bracket fan
comfort fan for mounting on the ceiling
Note 1 to entry: Ceiling fans and embedded fans are considered a kind of ceiling bracket fans in the sense of
this document.
[SOURCE: IEC 60879:2019, 3.9, modified - Note to entry has been added.]
3.104
handheld fan
portable comfort fan held in the hand during normal use, with the diameter of the fan wheel
(impeller or propeller) not larger than 150 mm
3.105
neckband fan
portable comfort fan designed to be worn around the user’s neck for use
3.106
ventilating fan
fan intended to displace air either from one side of a partition to the other, or within a duct
installed either on the fan inlet or on the fan outlet, or both
[SOURCE: IEC 60665:2018, 3.2]
4 Measurement methods and acoustical environments
4.1 General
This document is concerned with objective methods of engineering accuracy grade 2 in
, expressed in
accordance with ISO 12001:1996 for determining sound power levels LW
decibels (dB), with reference to a sound power of one picowatt (1 pW), of airborne acoustical
noise within the specified frequency range of interest (generally including the octave-bands
with centre frequencies from 125 Hz to 8 000 Hz), and for prescribed operating conditions of
the appliance to be measured.
Methods for determining sound power levels with precision accuracy grade 1 in accordance
with ISO 12001:1996, as specified for example in ISO 3741 and ISO 3745, are not included in
this document. They may, however, be applied if the appropriate test environment and
instrumentation are available.
NOTE 1 The noise values obtained under the described conditions of this document will not necessarily
correspond to the noise experienced under the operational conditions of practical use.
NOTE 2 For quality control during production etc., simplified methods can be appropriate. For noise reduction
purposes, other measurement methods employing, for example, narrow-band analysis or intensity techniques
usually have to be applied. These methods are not covered by this document.
The total noise emitted by machinery or equipment and radiated in all directions to the space
surrounding the machine can be characterized by the sound power of the machine. Within the
accuracy range of this document, the sound power of a machine is basically independent of
the environment in which the machine is installed
Therefore, the concept of sound power level has been chosen for expressing the noise
emission of appliances for household and similar purposes.
The preferred noise emission quantity is the A-weighted sound power level, L , in dB
WA
(re 1 pW).
According to this document, two principal methods exist, the direct method and the
comparison method, as described in 4.2 and 4.3. These two methods can be used
alternatively.
Different types of environments, as described in 4.4, may be used. A part of the IEC 60704-2
series may, if necessary, exclude one or several combinations among those available.
4.2 Direct method
The direct method can be used only for measurements in qualified test environments in
accordance with ISO 3744:2010 for free field conditions over reflecting plane(s), and in
accordance with ISO 3743-2:2018 for special reverberation test rooms.
With this method, the sound power level is determined
– in free field conditions over reflecting plane(s), from time-averaged sound pressure levels
(on a mean-square basis) over the measurement surface and from the area of the
measurement surface, S, or
– in reverberation and special reverberation test rooms, from averaged sound pressure
levels, and from the reverberation time and the volume of the test room.
If for a measurement in a free field, reverberation or special reverberation room is not
possible because the appliance cannot be placed or operated in such an environment, the
intensity method in accordance with ISO 9614-1:1993, ISO 9614-2:1996, and ISO 9614-
3:2002 shall be applied. For the intensity method, the standard deviations given in the parts of
the IEC 60704-2 series and IEC 60704-3:2019 are not applicable unless stated explicitly.
These methods yield results expressed in A-weighted sound power levels (and in octave- or
1/3 octave-band sound power levels, if required) that are calculated directly from measured
sound pressure levels.
NOTE This method can also be used in conjunction with more precise methods, such as those given in ISO 3741
and ISO 3745.
If audible discrete tones are present in the noise emitted by the source, the estimated
standard deviation of the measured sound pressure levels in the special reverberation room
can increase. In such cases, additional microphone positions or source positions can be
necessary, such as those specified in ISO 3743-2.
4.3 Comparison method
The comparison method for measurement is explicitly described in ISO 3743-1:2010 and in
ISO 3743-2:2018.
NOTE The term "comparison method" is not explicitly given in ISO 3744:2010, but when applying the "absolute
comparison test" for the determination of the environmental correction given in A.3 of ISO 3744:2010, by using a
reference sound source, the procedure is, in fact, a comparison method.
With this method, the sound power level is determined by comparing the averaged values (on
a mean-square basis) of the sound pressure levels produced by the source in the test room to
the averaged values of the sound pressure levels produced in the same room by a calibrated
reference sound source (RSS) of known sound power output, complying with the requirements
of ISO 6926:2016. The difference in sound pressure levels is equal to the difference in sound
power levels when conditions are the same for both sets of measurements.
This method yields results expressed in octave- or 1/3 octave-band sound power levels, and
the A-weighted sound power level is calculated from the octave- or 1/3 octave-band sound
power levels.
To check whether there is a systematic difference between results obtained in different
environments, the use of the comparison method is recommended.
If audible discrete tones 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 can increase. In such cases, additional microphone positions
or source positions can be necessary, such as those specified in ISO 3743-1 or ISO 3743-2.
4.4 Acoustical environments
4.4.1 General requirements and criterion for adequacy of the test environment
They are given in the following clauses:
– Clause 4 of ISO 3743-1:2010 for hard-walled test rooms;
– Clause 5 of ISO 3743-2:2018 for special reverberation test rooms and
– Clause 4 of ISO 3744:2010 for free-field conditions over a reflecting plane.
A classification of different types of noise is given in ISO 12001:1996. The method specified
in ISO 3744:2010 is suitable for measurements of all types of noise emitted by household
appliances. The methods specified in ISO 3743-1:2010 and ISO 3743-2:2018 are suitable for
all types of noise, except for sources of impulsive noise consisting of short-duration noise
bursts. This will be taken into account in the preparation of parts of the IEC 60704-2 series.
The method specified in ISO 3744:2010 is applicable to noise sources of any size. Limitations
for the size of the source are given in 4.2 of ISO 3743-1:2010 and in Clause 5 of
ISO 3743-2:2018. This will be taken into account in the preparation of parts of the
IEC 60704-2 series.
The methods specified in ISO 3743-1, ISO 3743-2 and ISO 3744 can be used for measuring
noise emitted by fans.
NOTE For free-field conditions over a reflecting plane, the absolute comparison test for the qualification of the
environment, described in Clause A.2 of ISO 3744:2010, is preferred.
Guidelines for the design of simple test rooms with free-field conditions are given in Annex C.
Guidelines for the design of a suitable special reverberation test room are given in
ISO 3743-2:2018, Annex A.
4.4.2 Criterion for background noise level
Requirements for the background noise level are given in 4.5 of ISO 3743-1:2010, in 6.5 of
ISO 3743-2:2018 and in 4.2 of ISO 3744:2010. Averaged over the microphone positions, the
background noise level shall be at least 6 dB below, and preferably more than 15 dB below,
the sound pressure level to be measured.
NOTE If the difference between the sound pressure levels of the background noise and the appliance noise is
less than 6 dB, see 8.2.
4.4.3 Environmental conditions
Environmental conditions having an adverse effect on the microphone used for the
measurements (for example, strong electric or magnetic fields, wind, impingement of air
discharge from the equipment being tested, high or low temperatures) shall be avoided by
proper selection or positioning of the microphone.
The instructions of the manufacturers of the measurement instruments regarding adverse
environmental conditions shall be followed. The microphone shall always be oriented in such
a way that the angle of incidence of the sound waves is that for which the microphone is
calibrated.
4.5 Measurement uncertainties
4.5.1 General
The estimated values of the standard deviations of reproducibility of sound power levels
determined in accordance with this document are given in 9.1 of ISO 3743-1:2010, in 11.1 of
ISO 3743‑2:2018 and in 9.1 of ISO 3744:2010. But for a particular family of appliances of
similar size with similar operating conditions, the standard deviations of reproducibility can be
smaller than these values. Hence, in the IEC 60704-2 series, standard deviations smaller than
those listed in ISO standards can be stated if substantiation is available from the results of
suitable interlaboratory tests.
In the case of discrepancies between the measurements where the results normally remain
inside the foreseen standard deviation, it can be helpful to perform measurements according
to the upper grade of accuracy: grade 1, laboratory or precision, as described in ISO 3741 or
ISO 3745.
4.5.2 Standard deviations on repeatability and reproducibility and standard
deviations related to declaration and verification
The estimated values of standard deviations of sound power levels determined in accordance
with this document are given in Table 1:
Table 1 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
0,4 1,0
For the purpose of determining and verifying declared noise emission values in accordance
with IEC 60704-3, the values in Table 2 apply:
Table 2 – Standard deviations for declaration and verification
Standard deviation
dB
σ (production) σ (total) σ (reference)
P t M
0,5 to 1,0 1,0 to 1,4 1,5
NOTE The standard deviation of repeatability, reproducibility and production
and the total standard deviation have not been verified recently. Because of
technical development of the appliances, it is possible that these values are
not correct anymore.
5 Instrumentation
5.1 Instrumentation for measuring acoustical data
Requirements for the instrumentation system and for its calibration are given in Clause 5 of
ISO 3743-1:2010, in Clause 7 of ISO 3743-2:2018 and in Clause 5 of ISO 3744:2010.
The instrumentation system shall meet the requirements for a type 1 instrument laid down in
IEC 61672-1:2013, in accordance with the basic standard used. For measurements in octave-
and 1/3 octave-bands, the instrumentation system shall meet the requirements of
IEC 61260‑1:2014.
RSS shall meet the requirements of ISO 6926:2016, and shall be calibrated annually.
The use of a windscreen is mandatory, and necessary corrections for changes in the
microphone sensitivity shall be added to the observed sound pressure levels.
5.2 Instrumentation for measuring climatic conditions
5.2.1 The temperature is determined with instruments having an accuracy of ±1 °C.
5.2.2 The relative humidity is determined with instruments having an absolute accuracy of
±2 % within the measuring range.
5.2.3 The absolute air pressure is determined with instruments having an accuracy of
±0,5 kPa.
5.3 Instrumentation for measuring operating conditions
5.3.1 The voltage at the plug of the cable or cord of mains-powered appliances is
measured with voltmeters having an accuracy of class 0,5 instruments.
5.3.2 The voltage at the battery terminals of battery-powered appliances is measured with
voltmeters having an accuracy of class 0,5 instruments.
5.3.3 The rotational speed of motors, attachments, etc. is measured, if necessary, with
speed indicators having an accuracy of ±1 % of full scale.
6 Operation and location of appliances under test
6.1 Equipping and pre-conditioning of appliances
6.1.1 The appliance is equipped with attachments, accessories, etc. as delivered by the
manufacturer for the intended use or function.
6.1.2 Care shall be taken to ensure that any auxiliary equipment (such as electrical
conduits or cables, piping for water supply or drainage, air ducts, etc.) necessary for
the operation of the appliance, does not radiate a significant amount of sound into
the test environment or change the sound output of the appliance. Guidelines are
given in 6.2 of ISO 3743-1:2010, in 8.4 of ISO 3743-2:2018 and in 6.2
ISO 3744:2010.
6.1.3 Prior to noise measurements, the appliance, equipped as for intended use, shall
have been in operation for at least 10 min to prevent excessive noise due to parts
not being run in.
6.1.4 Not applicable.
6.2 Supply of electric energy and of water or gas
6.2.1 Appliances with mains powered electric motor(s) are supplied at rated voltage and at
rated frequency. Appliances designed for DC only are supplied with DC. If a voltage
range and/or a frequency range are indicated, then the supply voltage and/or
frequency shall be the nominal system voltage and/or system frequency of the
country in which the appliance is intended to be used. Tolerances shall not exceed
±2 % for voltage and ±1 % for frequency throughout the test.
The nominal system voltage and its values are defined in IEC 60038:2009.
If the rated voltage of a mains supplied appliance differs from the nominal system voltage as
common in the country of use, measurements should be carried out at the nominal voltage as
common in the country of use.
The supply voltage is measured at the plug of a non-detachable cable or cord, or at the
appliance inlet if a detachable cable is provided, but in no case at the entrance of extension
cables or cords.
6.2.2 Appliances with battery-powered electric motor(s) are started, for noise
measurements, with full-charged batteries as specified by the manufacturer, and the
measurements are interrupted when the battery voltage under load has dropped for
lead-acid batteries to 0,9
...

IEC 60704-2-7 ®
Edition 3.0 2026-11
INTERNATIONAL
STANDARD
Household and similar electrical appliances - Test code for the determination of
airborne acoustical noise -
Part 2-7: Particular requirements for fans
ICS 17.140.20; 23.120 ISBN 978-2-8327-1570-3

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CONTENTS
FOREWORD . 2
INTRODUCTION . 4
1 Scope . 5
3 Terms and definitions . 5
4 Measurement methods and acoustical environments . 6
5 Instrumentation. 7
6 Operation and location of appliances under test . 7
7 Measurement of sound pressure levels . 9
9 Information to be recorded . 11
10 Information to be reported . 11
Annex B (normative) Test enclosure . 12
Bibliography . 13

Figure 101 – Measurement surface – hemisphere – with 10 microphone positions, for
wall bracket fans . 10

Table 1 – Standard deviations of sound power levels . 7
Table 2 – 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 2-7: Particular requirements for fans

FOREWORD
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IEC 60704-2-7 has been prepared by subcommittee 59L: Small household appliances, of IEC
technical committee 59: Performance of household and similar electrical appliances . It is an
International Standard.
This third edition cancels and replaces the second edition published in 2020. This edition
constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous
edition:
a) alignment with IEC 60704-1:2021;
b) scope has been expanded to handheld, neckband and embedded fans;
c) positioning and mounting have been reworked;
d) test concept of partition ventilating fans has changed to measure both inlet and outlet side
together.
The text of this International Standard is based on the following documents:
Draft Report on voting
59L/322/FDIS 59L/324/RVD
Full information on the voting for its approval can be found in the report on voting indicated in
the above table.
The language used for the development of this International Standard is English.
This document was drafted in accordance with ISO/IEC Directives, Part 2, and developed in
accordance with ISO/IEC Directives, Part 1 and ISO/IEC Directives, IEC Supplement, available
at www.iec.ch/members_experts/refdocs. The main document types developed by IEC are
described in greater detail at www.iec.ch/publications.
This Part 2-7 is to be used in conjunction with IEC 60704-1:2021, Household and similar
electrical appliances - Test code for the determination of airborne acoustical noise - Part 1:
General requirements.
The relevant text of IEC 60704-1:2021 as amended by this standard establishes the test code
for fans.
This Part 2-7 supplements or modifies the corresponding clauses in IEC 60704-1:2021, so as
to establish the test code for fans. When a particular subclause of IEC 60704-1:2021 is not
mentioned in this Part 2-7, 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 IEC 60704-1:2021 shall be adapted accordingly.
Subclauses, tables and figures that are numbered starting from 101 are additional to those in
IEC 60704-1:2021.
Unless notes are in a new subclause or involve notes in IEC 60704-1:2021, they are numbered
starting from 101, including those in a replaced
...

IEC 60704-2-7 ®
Edition 3.0 2026-11
NORME
INTERNATIONALE
Appareils électrodomestiques et analogues - Code d'essai pour la détermination
du bruit aérien -
Partie 2-7: Exigences particulières pour les ventilateurs
ICS 17.140.20; 23.120 ISBN 978-2-8327-1570-3

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SOMMAIRE
AVANT-PROPOS . 2
INTRODUCTION . 5
1 Domaine d'application . 6
3 Termes et définitions . 6
4 Méthodes de mesure et environnements acoustiques . 7
5 Appareillage . 8
6 Fonctionnement et emplacement des appareils en essai . 8
7 Mesure des niveaux de pression acoustique . 10
9 Informations à relever . 13
10 Informations à consigner . 13
Annexe B (normative) Enceinte d'essai . 14
Bibliographie . 15

Figure 101 – Surface de mesure – hémisphère – avec 10 positions de microphones,
pour ventilateurs à applique murale . 12

Tableau 1 – Écarts-types des niveaux de puissance acoustique . 8
Tableau 2 – Écarts-types pour la déclaration et la vérification . 8

COMMISSION ÉLECTROTECHNIQUE INTERNATIONALE
____________
Appareils électrodomestiques et analogues -
Code d'essai pour la détermination du bruit aérien -
Partie 2-7: Exigences particulières pour les ventilateurs

AVANT-PROPOS
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L'IEC 60704-2-7 a été établie par le sous-comité 59L: Petits appareils domestiques, du comité
d'études 59 de l'IEC: Aptitude à la fonction des appareils électrodomestiques et analogues. Il
s'agit d'une Norme internationale.
Cette troisième édition annule et remplace la deuxième édition parue en 2020. Cette édition
constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition
précédente:
a) alignement sur l'IEC 60704-1:2021;
b) le domaine d'application a été étendu aux ventilateurs portatifs, aux ventilateurs de cou et
aux ventilateurs encastrés;
c) le positionnement et le montage ont été revus;
d) le concept d'essai des aérateurs de cloison a été modifié pour mesurer à la fois les côtés
entrée et sortie.
Le texte de cette Norme internationale est issu des documents suivants:
Projet Rapport de vote
59L/322/FDIS 59L/324/RVD
Le rapport de vote indiqué dans le tableau ci-dessus donne toute information sur le vote ayant
abouti à son approbation.
La langue employée pour l'élaboration de cette Norme internationale est l'anglais.
Ce document a été rédigé selon les Directives ISO/IEC, Partie 2, il a été développé selon les
Directives ISO/IEC, Partie 1 et les Directives ISO/IEC, Supplément IEC, disponibles sous
www.iec.ch/members_experts/refdocs. Les principaux types de documents développés par
l'IEC sont décrits plus en détail sous www.iec.ch/publications.
La présente Partie 2-7 doit être utilisée conjointement avec l'IEC 60704-1:2021, Appareils
électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien –Partie 1:
Exigences générales.
Le texte correspondant de l'IEC 60704-1:2021 modifié par la présente norme établit le code
d'essai pour les ventilateurs.
La présente Partie 2-7 complète ou modifie les articles correspondants de l'IEC 60704-1:2021
de façon à établir le code d'essai pour les ventilateurs. Lorsqu'un paragraphe particulier de
l'IEC 60704-1:2021 n'est pas mentionné dans cette Partie 2-7, ce paragraphe s'applique pour
autant que cela soit raisonnable. Lorsque la présente norme mentionne "addition",
"modification" ou "remplacement", les exigences, modalités d'essai ou commentaires
correspondants de l'IEC 60704-1:2021 doivent être adaptés en conséquence.
Les paragraphes, tableaux et figures qui s'ajoutent à ceux de l'IEC 60704-1:2021 sont
numérotés à partir de 101.
À l'exception de celles qui sont dans un nouveau paragraphe ou de celles qui concernent des
notes de l'IEC 60704-1:2021, les notes sont numérotées à partir de 101, y compris celles des
articles ou paragraphes qui sont remplacés.
Les annexes qui sont ajoutées sont désignées AA, BB, etc.
Dans la présente norme, les caractères d'imprimerie suivants sont utilisés:
– termes définis à l'Article 3: caractères gras.
Une liste de toutes les parties de la série IEC 60704, publiées sous le titre général Appareils
électrodomestiques et analogues - Code d'essai pour la détermination du bruit aérien, se trouve
sur le site web de l'IE
...