IEC 60704-2-13:2011

Household and similar electrical appliances - Test code for the determination of airborne acoustical noise - Part 2-13: Particular requirements for range hoods

IEC 60704-2-13:2011(E) applies to electrical range hoods 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 range hoods with an external fan which may be mounted inside or outside of the room where the range hood is located. This second edition cancels and replaces the first edition (2000) and constitutes an adaptation to the third edition of IEC 60704-1 (2010). 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. This Part 2-13 supplements or modifies the corresponding clauses in IEC 60704-1, so as to establish the test code for range hoods. 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 is to be adapted accordingly. Subclauses, tables and figures that are numbered starting from 101 are additional to those in Part 1. 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. Additional annexes are lettered AA, BB, etc.
This publication is to be read in conjunction with This publication is to be read in conjunction with IEC 60704-1:2010.

General Information

• Status: Published
• Publication Date: 26-Jan-2011
• ICS: 17.140.20 - Noise emitted by machines and equipment
• ICS: 97.040.20 - Cooking ranges, working tables, ovens and similar appliances
• Technical Committee: SC 59K - Performance of household and similar electrical cooking appliances
• Drafting Committee: MT 3 - TC 59/SC 59K/MT 3
• Current Stage: DELPUB - Deleted Publication
• Completion Date: 26-Oct-2016

Relations

• Revised: IEC 60704-2-13:2016 - 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
• Effective Date: 05-Sep-2023

Standards Content (Sample)

IEC 60704-2-13
®

Edition 2.0 2011-01
INTERNATIONAL
STANDARD

Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-13: Particular requirements for range hoods



IEC 60704-2-13:2011(E)

---------------------- Page: 1 ----------------------
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IEC 60704-2-13
®

Edition 2.0 2011-01
INTERNATIONAL
STANDARD


Household and similar electrical appliances – Test code for the determination of
airborne acoustical noise –
Part 2-13: Particular requirements for range hoods


INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
PRICE CODE
T
ICS 17.140.20; 97.040.20 ISBN 978-2-88912-328-5

® Registered trademark of the International Electrotechnical Commission

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– 2 – 60704-2-13  IEC:2011(E)
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


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
international co-operation on all questions concerning standardization in the electrical and electronic fields. To
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8) Attention is drawn to the Normative references cited in this publication. Use of the referenced publications is
indispensable for the correct application of this publication.
9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the subject of
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: Ovens and
microwave ovens, cooking ranges and similar appliances, of IEC technical committee 59:
Performance of household and similar electrical appliances.
This second edition cancels and replaces the first edition (2000) and constitutes an
adaptation to the third edition of IEC 60704-1 (2010).
The text of this standard is based on the following documents:
FDIS Report on voting
59K/219/FDIS 59K/223/RVD

Full information on the voting for the approval of this standard can be found in the report on
voting indicated in the above table.

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60704-2-13  IEC:2011(E) – 3 –
This publication 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 range hoods. 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 is to be adapted accordingly.
Subclauses, tables and figures that are numbered starting from 101 are additional to those in
Part 1.
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.
Additional annexes are lettered AA, BB, etc.
The committee has decided that the contents of this publication will remain unchanged until
the stability date indicated on the IEC web site under "http://webstore.iec.ch" in the data
related to the specific publication. At this date, the publication will be
• reconfirmed,
• withdrawn,
• replaced by a revised edition, or
• amended.
A bilingual version of this publication may be issued at a later date.

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– 4 – 60704-2-13  IEC:2011(E)
INTRODUCTION
The measuring conditions specified in this Part 2-13 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.
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.
Compared to the first edition (2000) of this Part 2-13, the second edition doesn’t contain the
description of an appropriate test enclosure which has now been incorporated in Part 1. The
scope of this Part 2-13 has been extended to range hoods with an external fan. Furthermore
the values of standard deviations of sound power levels determined according to this part are
given.
In case of unavailability of an acoustical environment which is specified in Clause 4 of
ISO 3743-1, ISO 3743-2 and ISO 3744 alternatively the sound power of range hoods can be
determined according to Annex AA using the sound intensity method specified in ISO 9614-1
and ISO 9614-2. This method is not suitable if the source under test has significant noise over
4,0 kHz for octave band frequencies or 6,3 kHz for one-third octave band frequencies. Sound
intensity method for the determination of sound power levels shall not be used for the purpose
of verification.
NOTE As stated in the introduction to IEC 60704-1, this test code is concerned with airborne noise only.

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60704-2-13  IEC:2011(E) – 5 –
HOUSEHOLD AND SIMILAR ELECTRICAL APPLIANCES –
TEST CODE FOR THE DETERMINATION
OF AIRBORNE ACOUSTICAL NOISE –

Part 2-13: Particular requirements for range hoods



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 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 range hoods with an external fan
which may be mounted inside or outside of the room where the range hood is located.
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 range hoods.
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 range hood
under test fulfils the requirements specified in 1.3 of ISO 3743-1 and ISO 3743-2.
1.2 Object
Addition:
This standard describes the determination of the noise emission of household range hoods
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).
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).
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:

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– 6 – 60704-2-13  IEC:2011(E)
The estimated values of standard deviations of sound power levels, determined according to
this standard, are as follows:
Table 101 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
0,4 1,0
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:
Table 102 – Standard deviations for declaration and verification
Standard deviation (dB)
σ (production) σ (total) σ (reference)
P t M
1,5 – 1,7 1,8 – 2,0 2,0
2 Normative references
This clause of Part 1 is applicable with the following addition:
Addition:
IEC 61591:1997, Household range hoods – Methods for measuring performance
1
Amendment 1 (2005)
Amendment 2 (2010)
ISO 7235:2003, Acoustics - Laboratory measurement procedures for ducted silencers and air-
terminal units - Insertion loss, flow noise and total pressure loss
3 Terms and definitions
This clause of Part 1 is applicable with the following addition:
3.101
range hood
appliance installed over a hob and through which air is passed to remove contaminants from
the room
[IEC 61591, definition 3.1]
3.102
recirculation-air range hood
range hood containing filters to remove contaminants, after which the cleaned air is
discharged back into the room
[IEC 61591, definition 3.2]
—————————
1
 There exists a consolidated edition 1.1 of IEC 61591 (2005), that includes IEC 61591 (1997) and its
amendment 1 (2005).

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60704-2-13  IEC:2011(E) – 7 –
3.103
air-extracting range hood
range hood which discharges the collected air to the outside of the building by means of
ducting. The range hood can incorporate an internal or external fan.
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 appliance under test
This clause of Part 1 is applicable except as follows:
6.1 Equipping and pre-conditioning of appliance
6.1.1
Addition:
Recirculation-air range hoods should be fitted with a clean filter(s).
Air-extraction range hoods shall be fitted with the pipe coupling ring, if any, having the largest
diameter among those provided by the manufacturer. If the range hood is designed to
accommodate additional filters, those filters shall be clean and appropriately fitted.
6.1.3
Replacement:

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– 8 – 60704-2-13  IEC:2011(E)
Prior to noise measurements, the range hood shall have been in operation for running in 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 range hood equipped for its
intended use is operated for stabilizing at the highest speed setting for normal use (see notes
in 1.2) for 10 min.
6.2 Supply of electrical energy and of water or gas
6.2.3 and 6.2.4 Not applicable
6.4 Loading and operating of appliance during test
6.4.2
Replacement:
The appliances shall be equipped according to 6.1.1.
The range hood shall be operated at the highest speed setting for normal use (see notes
in 1.2).
Air-extraction range hoods 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.
Range hoods with 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 range hood, 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 exhaust to the range hood shall also be avoided.
NOTE 101 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 range hood, if any, shall be used.
Range hoods 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

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60704-2-13  IEC:2011(E) – 9 –
6.5 Location and mounting of appliance
6.5.1
Replacement:
Range hoods not intended to be placed against a wall shall be supported by a stand with
resilient means (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 a minimum distance of 1 m between any surface
(including protruding parts) of the range hood and the nearest wall;
• or at a height of 0,6 m from a reflecting plane of the free field environment, taking into
account the shape and size of the specified measurement surface.
Care shall be taken in order to avoid any kind of interference between the supports and the
air intake of the appliance under test.
6.5.2 and 6.5.3 Not applicable
6.5.4
Replacement:
Range hoods intended to be placed against a wall are placed with 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 (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.
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.
6.5.101
For range hoods with external fan the air inlet device shall be located and mounted as
described in 6.5.1 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:

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– 10 – 60704-2-13  IEC:2011(E)
7.1 Microphone array, measurement surface and RSS location for essentially free-
field conditions over reflecting plane(s)
7.1.1
Replacement:
For range hoods not intended to be placed against a wall, including built-in appliances, the
measurement surface is a parallelepiped with nine microphone positions, as specified in 7.3.1
of ISO 3744 and in Figure 1 of IEC 60704-1. Additional measurement positions may be
required according to 7.3.2 of ISO 3744. The number of microphone positions may also be
reduced according to 7.4.2 of ISO 3744.
While defining the reference box around the appliance, the loading pipe connected to a range
hood operating in exhausting mode should not be taken into account.
NOTE 101 The front of the appliance is directed in the direction of the x-axis. The preferred value of the
measurement distance d is 1 m.
7.1.2
Replacement:
For range hoods intended to be placed against a wall, including built-in appliances, the
measurement surface is a parallelepiped with six microphone positions, as specified in 7.3.1
of ISO 3744 and in Figure 2 of IEC 60704-1. Additional measurement positions may be
required according to 7.3.2 of ISO 3744. The number of microphone positions may also be
reduced according to 7.4.2 of ISO 3744.
While defining the reference box around the appliance, the loading pipe connected to a range
hood operating in exhausting mode should not be taken into account.
NOTE 101 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
Addition:
Noise emitted by the housing or by the air outlet of an external fan shall be considered as
background noise.

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60704-2-13  IEC:2011(E) – 11 –
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, built-in group, 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

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– 12 – 60704-2-13  IEC:2011(E)
d
l3 l2 1,5 x 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.
l1
The connections shall not interfere with the air flow to
avoid any additional noise or pressure drop.
Pipe with smooth inner walls
l1 + l2 + l3 = 3000 mm
≥ d
l1 >= 5 x d

∅d
d
For the measurement of the diameter d see 6.1.1 ø d
Dimensions in millimetres
Dimensions in millimeters
a
Minimum insertion loss in decibels for octave bands*
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
8 20 20 20 20 20 20
a
* Insertion loss measured according to ISO 7235

IEC  152/11

Figure 101 – Standard load

Resilient means
900 50
35
200
600
60
35
100 50 250
Resilient means
Dimensions in millimeters

IEC  153/11
Figure 102 – Example of standard stand

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60704-2-13  IEC:2011(E) – 13 –
d
l3 l2 1,5 x d
90°
External fan
Muffler according to the manufacurer's
instructions, if a muffler is provided.
l1
The connections shall not interfere with the air flow to
avoid any additional noise or pressure drop.
Pipe with smooth inner walls
l1 + l2 + l3 = 3000 mm
≥ d
l1 >= 5 x d

∅d
d
For the measurement of the diameter d see 6.1.1 ø d
Dimensions in millimetres
Dimensions in millimeters
a
Minimum insertion loss in decibels for octave bands*
125 Hz 250 Hz 500 Hz 1 kHz 2 kHz 4 kHz 8 kHz
8 20 20 20 20 20 20
a
* Insertion loss measured according to ISO 7235
IEC  154/11


Figure 103 – Standard load for range hoods with an external fan

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– 14 – 60704-2-13  IEC:2011(E)
Annexes
The annexes of Part 1 are applicable except as follows:

Annex A
(normative)


This annex of Part 1 is not applicable.

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60704-2-13  IEC:2011(E) – 15 –
Addition:
Annex AA
(informative)

Sound intensity method for the determination
of sound power levels of range hoods

NOTE This Annex AA supplements or modifies the corresponding clauses in IEC 60704-1, so as to establish the
test code for range hoods using sound intensity.
When “Part 1” is mentioned in this standard, it refers to IEC 60704-1.
When a particular subclause of Part 1 is not mentioned in this annex, that subclause is applicable as far as
reasonable. Where this annex states "addition", "modification" or "replacement", the relevant requirements, test
specifications or explanatory matter in Part 1 should be adapted accordingly.
AA.1 Scope and object
Clause 1 of Part 1 is applicable except as follows:
AA.1.1 Scope
AA.1.1.1 General
Addition to 1.1.1 of Part 1:
These particular requirements apply to electrical range hoods 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 range hoods with an external fan
which may be mounted inside or outside of the room where the range hood is mounted.
Sound intensity method for the determination of sound power levels shall not be used for the
purpose of verification.
AA.1.1.2 Types of noise
Replacement of 1.1.2 of Part 1:
The methods specified in ISO 9614-1 and ISO 9614-2 can be used for measuring noise
emitted by range hoods, except the source under test has significant noise in the one-third-
octave-bands below 50 Hz and above 6,3 kHz.
NOTE 101 For the purpose of this assessment, significant levels are band levels which after A-weighting are no
more than 6 dB below the A-weighted value computed.
AA.1.1.3 Size of source
Replacement of 1.1.3 of Part 1:
The methods specified in ISO 9614-1 and ISO 9614-2 are applicable to noise sources of any
size. The extend of the source is defined by the choice of the measurement surface.
AA.1.2 Object
Addition to 1.2 of Part 1:

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– 16 – 60704-2-13  IEC:2011(E)
This standard describes the determination of the noise emission of household range hoods
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).
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).
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.
AA.1.3 Measurement uncertainty
Replacement of 1.3 of Part 1:
The uncertainty in the determination of the sound power level of a noise source is related
• to the nature of the sound field of the source;
• to the nature of the extraneous sound field;
• to the absorption of the source under test;
• to the type of intensity-field sampling and measurement procedure employed.
The normal range for A-weighted data is covered by the one-octave bands from 63 Hz to
4 kHz, and the one-third-octave bands from 50 Hz to 6,3 kHz.
The estimated values of standard deviations of sound power levels, determined according to
this standard, are as follows:
Table AA.101 – Standard deviations of sound power levels
Standard deviation (dB)
σ (repeatability) σ (reproducibility)
r R
1,5 2,0
AA.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:
Table AA.102 – Standard deviations for declaration and verification
Standard deviation (dB)
σ (production) σ (total) σ (refere
...