Cooking fume extractors - Methods for measuring performance

IEC 61591:2019 applies to cooking fume extractors incorporating a fan for the recirculation or extraction mode situated in a household kitchen.
It can also be used for cooking fume extractors where the fan is mounted separately from the appliance, but controlled by the appliance when the fan is defined in the technical documentation (e.g. name plate data) and instructions for installation.
This document deals also with down-draft systems arranged beside, behind or under the cooking appliance.
This document defines the main performance characteristics of these appliances, which are of interest to the user, and specifies methods for measuring these characteristics.
This document does not specify a classification or ranking for performance.
This document does not deal with safety requirements that are in accordance with IEC 60335-1 and IEC 60335-2-31.
This second edition cancels and replaces the first edition published in 1997, Amendment 1:2005 and Amendment 2:2010. This edition constitutes a technical revision.
This edition includes the following significant technical changes with respect to the previous edition:
a) new subclause about instruments and measurements (see 6.6);
b) new procedure for measuring the fluid dynamic efficiency (FDE), which follows the CENELEC proposal in principle;
c) revised procedure for determining the odour reduction for cooking fume extractors in recirculation mode (see Clause 12);
d) modification to the measurement of the effectiveness of the lighting system (see Clause 11);
e) clearer procedure to measure the grease absorption (see Clause 13);

Extracteurs de fumée de cuisine - Méthodes de mesure de l'aptitude à la fonction

L'IEC 61591:2019 s'applique aux extracteurs de fumée de cuisine comportant un ventilateur pour le mode recyclage ou extraction, installés dans une cuisine à usage domestique.
Il peut également être utilisé pour les extracteurs de fumée de cuisine lorsque le ventilateur est monté séparément de l'appareil, mais est commandé par celui-ci lorsqu'il est mentionné dans la documentation technique (données inscrites sur la plaque signalétique, par exemple) et dans les instructions d'installation.
Le présent document couvre également les extracteurs verticaux installés à côté, à l'arrière ou au-dessous de l'appareil de cuisson.
Le présent document définit les caractéristiques de performance principales de ces appareils qui sont pertinentes pour l'utilisateur et spécifie les méthodes de mesure de ces caractéristiques.
Le présent document ne spécifie pas un système de classement pour l'aptitude à la fonction de ces appareils.
Le présent document ne traite pas des exigences de sécurité qui sont conformes aux normes IEC 60335-1 et IEC 60335-2-31.
Cette deuxième édition annule et remplace la première édition parue en 1997, l'Amendement 1:2005 et l'Amendement 2:2010. Cette édition constitue une révision technique.
Cette édition inclut les modifications techniques majeures suivantes par rapport à l'édition précédente:
a) ajout d'un nouveau paragraphe portant sur les instruments et les mesurages (voir 6.6);
b) ajout d'une nouvelle procédure pour le mesurage du rendement dynamique des fluides (FDE, Fluid Dynamic Efficiency), suivant la proposition de principe du CENELEC;
c) révision de la procédure visant à déterminer la réduction des odeurs des extracteurs de fumée de cuisine fonctionnant en mode recyclage (voir Article 12);
d) modification de la procédure de mesure de l'efficacité du système d'éclairage (voir Article 11);
e) clarification de la procédure de mesure de l'absorption des graisses (voir Article 13).

General Information

Status
Published
Publication Date
13-Oct-2019
Current Stage
PPUB - Publication issued
Completion Date
14-Oct-2019
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IEC 61591
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Cooking fume extractors – Methods for measuring performance
Extracteurs de fumée de cuisine – Méthodes de mesure de l'aptitude à
la fonction
IEC 61591:2019-10(en-fr)
---------------------- Page: 1 ----------------------
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---------------------- Page: 2 ----------------------
IEC 61591
Edition 2.0 2019-10
INTERNATIONAL
STANDARD
NORME
INTERNATIONALE
Cooking fume extractors – Methods for measuring performance
Extracteurs de fumée de cuisine – Méthodes de mesure de l'aptitude à
la fonction
INTERNATIONAL
ELECTROTECHNICAL
COMMISSION
COMMISSION
ELECTROTECHNIQUE
INTERNATIONALE
ICS 97.040.20 ISBN 978-2-8322-7410-1

Warning! Make sure that you obtained this publication from an authorized distributor.

Attention! Veuillez vous assurer que vous avez obtenu cette publication via un distributeur agréé.

® Registered trademark of the International Electrotechnical Commission
Marque déposée de la Commission Electrotechnique Internationale
---------------------- Page: 3 ----------------------
– 2 – IEC 61591:2019 © IEC 2019
CONTENTS

FOREWORD ........................................................................................................................... 4

1 Scope .............................................................................................................................. 6

2 Normative references ...................................................................................................... 6

3 Terms and definitions ...................................................................................................... 7

4 Classification ................................................................................................................... 9

5 List of measurements ...................................................................................................... 9

6 General conditions for measurements .............................................................................. 9

6.1 Test room ............................................................................................................... 9

6.2 Installation and positioning ...................................................................................... 9

6.3 Electricity supply ................................................................................................... 10

6.4 Filters ................................................................................................................... 10

6.5 Fan control ........................................................................................................... 10

6.6 Instrumentation and measurements ...................................................................... 10

7 Dimensions and mass .................................................................................................... 11

7.1 Overall dimensions ............................................................................................... 11

7.2 Distance between cooking fume extractor and cooking appliance.......................... 11

7.3 Mass ..................................................................................................................... 12

8 Power measurement of low power modes ...................................................................... 12

9 Airborne acoustical noise ............................................................................................... 12

10 Volumetric airflow .......................................................................................................... 12

10.1 Purpose ................................................................................................................ 12

10.2 Measuring setup ................................................................................................... 12

10.3 Measurement of the volumetric airflow .................................................................. 14

10.4 Calculation of the fluid dynamic efficiency (FDE ) ........................................... 16

hood

11 Effectiveness of the lighting system ............................................................................... 17

11.1 Purpose ................................................................................................................ 17

11.2 Measurement ........................................................................................................ 17

11.3 Assessment .......................................................................................................... 19

12 Odour reduction ............................................................................................................. 19

12.1 Purpose ................................................................................................................ 19

12.2 Measuring setup ................................................................................................... 19

12.3 Measurement ........................................................................................................ 21

12.4 Calculation of the odour reduction factor ............................................................... 21

13 Grease absorption ......................................................................................................... 22

13.1 Purpose ................................................................................................................ 22

13.2 Measuring setup ................................................................................................... 22

13.3 Preparation ........................................................................................................... 26

13.3.1 Determining the mass .................................................................................... 26

13.3.2 Warm-up period ............................................................................................. 27

13.4 Measurement ........................................................................................................ 27

13.5 Assessment .......................................................................................................... 27

Bibliography .......................................................................................................................... 29

Figure 1 – Measurement of airflow ........................................................................................ 13

---------------------- Page: 4 ----------------------
IEC 61591:2019 © IEC 2019 – 3 –

Figure 2 – Example working point of a cooking fume extractor in extraction mode ................ 15

Figure 3 – Example diagram of the best efficiency point (BEP) ............................................. 17

Figure 4 – Measurement points for assessing the effectiveness of the lighting system .......... 19

Figure 5 – Example of a test room ........................................................................................ 20

Figure 6 – Chamber for the grease absorption of a range hood or a microwave hood

combination .......................................................................................................................... 24

Figure 7 – Chamber for the grease absorption of a down-draft system .................................. 25

Figure 8 – Cookware used for measuring the grease absorption ........................................... 26

Table 1 – Instruments ........................................................................................................... 11

Table 2 – Measurements ....................................................................................................... 11

Table 3 – Relevant measurement points for assessing the effectiveness of the lighting

system .................................................................................................................................. 18

---------------------- Page: 5 ----------------------
– 4 – IEC 61591:2019 © IEC 2019
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________
COOKING FUME EXTRACTORS –
METHODS FOR MEASURING PERFORMANCE
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 this end and

in addition to other activities, IEC publishes International Standards, Technical Specifications, Technical Reports,

Publicly Available Specifications (PAS) and Guides (hereafter referred to as "IEC Publication(s)"). Their

preparation is entrusted to technical committees; any IEC National Committee interested in the subject dealt with

may participate in this preparatory work. International, governmental and non-governmental organizations liaising

with the IEC also participate in this preparation. IEC collaborates closely with the International Organization for

Standardization (ISO) in accordance with conditions determined by agreement between the two organizations.

2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an international

consensus of opinion on the relevant subjects since each technical committee has representation from all

interested IEC National Committees.

3) IEC Publications have the form of recommendations for international use and are accepted by IEC National

Committees in that sense. While all reasonable efforts are made to ensure that the technical content of IEC

Publications is accurate, IEC cannot be held responsible for the way in which they are used or for any

misinterpretation by any end user.

4) In order to promote international uniformity, IEC National Committees undertake to apply IEC Publications

transparently to the maximum extent possible in their national and regional publications. Any divergence between

any IEC Publication and the corresponding national or regional publication shall be clearly indicated in the latter.

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assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsible for any

services carried out by independent certification bodies.

6) All users should ensure that they have the latest edition of this publication.

7) No liability shall attach to IEC or its directors, employees, servants or agents including individual experts and

members of its technical committees and IEC National Committees for any personal injury, property damage or

other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal fees) and

expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any other IEC

Publications.

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 61591 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 second edition cancels and replaces the first edition published in 1997, Amendment 1:2005

and Amendment 2:2010. This edition constitutes a technical revision.

This edition includes the following significant technical changes with respect to the previous

edition:
a) new subclause about instruments and measurements (see 6.6);

b) new procedure for measuring the fluid dynamic efficiency (FDE), which follows the

CENELEC proposal in principle;

c) revised procedure for determining the odour reduction for cooking fume extractors in

recirculation mode (see Clause 12);

d) modification to the measurement of the effectiveness of the lighting system (see Clause 11);

e) clearer procedure to measure the grease absorption (see Clause 13);
---------------------- Page: 6 ----------------------
IEC 61591:2019 © IEC 2019 – 5 –
The text of this International Standard is based on the following documents:
CDV Report on voting
59K/304/CDV 59K/306/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.

In this standard, the following print types are used:
• terms listed in Clause 3: Arial bold.

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.
---------------------- Page: 7 ----------------------
– 6 – IEC 61591:2019 © IEC 2019
COOKING FUME EXTRACTORS –
METHODS FOR MEASURING PERFORMANCE
1 Scope

This document applies to cooking fume extractors incorporating a fan for the recirculation

or extraction mode situated in a household kitchen.

It can also be used for cooking fume extractors where the fan is mounted separately from the

appliance, but controlled by the appliance when the fan is defined in the technical

documentation (e.g. name plate data) and instructions for installation.

This document deals also with down-draft systems arranged beside, behind or under the

cooking appliance.

This document defines the main performance characteristics of these appliances, which are of

interest to the user, and specifies methods for measuring these characteristics.
This document does not specify a classification or ranking for performance.

NOTE This document does not deal with safety requirements that are in accordance with IEC 60335-1 and

IEC 60335-2-31.
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 60584-1, Thermocouples – Part 1: EMF specifications and tolerances

IEC 60704-2-13, 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
IEC 62301, Household electrical appliances – Measurement of standby power

ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in

circular cross-section conduits running full – Part 1: General principles and requirements

ISO 5167-2, Measurement of fluid flow by means of pressure differential devices inserted in

circular cross-section conduits running full – Part 2: Orifice plates

ISO 5167-3, Measurement of fluid flow by means of pressure differential devices inserted in

circular cross-section conduits running full – Part 3: Nozzles and Venturi nozzles

ISO 5167-4, Measurement of fluid flow by means of pressure differential devices inserted in

circular cross-section conduits running full – Part 4: Venturi tubes
ISO 80000-1:2009, Quantities and units – Part 1: General
---------------------- Page: 8 ----------------------
IEC 61591:2019 © IEC 2019 – 7 –
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.

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
cooking fume extractor

appliance with fan and filter intended to collect and treat cooking fumes, which can be operated

in recirculation mode or extraction mode
3.2
range hood
cooking fume extractor installed over a cooking appliance
3.2.1
wall range hood
range hood mounted to the wall
3.2.2
island range hood
range hood mounted to the ceiling
3.2.3
ceiling range hood
range hood integrated onto or into the ceiling
3.2.4
built-in range hood
range hood mounted onto or into a cabinet
3.3
microwave hood combination
cooking fume extractor integrated in a microwave oven
3.4
multiple combination hood

cooking fume extractor where the fan is mounted separately of the appliance, but controlled by

the appliance
3.5
down-draft system

cooking fume extractor intended for installation adjacent to a cooking appliance or integrated

in a cooking appliance that draws vapour down into a duct

Note 1 to entry: A down-draft system can also be a system where the fan is mounted separately from the appliance

but controlled by the appliance.
3.6
recirculation mode

mode of a cooking fume extractor that discharges air back into the room, which includes an

odour-reduction filter
---------------------- Page: 9 ----------------------
– 8 – IEC 61591:2019 © IEC 2019
3.7
extraction mode

mode of a cooking fume extractor that discharges the air to the outside of the building by

means of ducting

Note 1 to entry: Extraction mode is also known as "vented mode" or "ducted mode".

3.8
rated voltage
voltage assigned to the cooking fume extractor by the manufacturer
3.9
grease absorption factor
percentage of grease retained within a grease filter
3.10
grease filter

components for absorbing grease, which are intended to be replaced or removed for cleaning

without tools
3.11
odour-reduction filter
components for reducing odour
3.12
odour reduction factor
capability of the cooking fume extractor to reduce odours
3.13
odour dispersion time

time taken to reduce odours to a defined level after the odour generating source has been

switched off
3.14
highest continuous setting for normal use

control setting of cooking fume extractor at highest speed, excluding the boost position

setting

Note 1 to entry: Marked setting on the appliance, which is described in the instructions for use.

3.15
boost position setting

marked control setting at maximum fan speed, which is automatically limited in duration

Note 1 to entry: Marked setting on the appliance, which is described in the instructions for use.

3.16
working point
intersection point of pressure/airflow curve and resistance curve
3.17
best efficiency point
BEP
maximum value of the efficiency of a cooking fume extractor
Note 1 to entry: This term applies to the French language only.
---------------------- Page: 10 ----------------------
IEC 61591:2019 © IEC 2019 – 9 –
3.18
lighting system

devices used for the illumination of the cooking surface, excluding ambient illumination, unless

there is only one control switch
Note 1 to entry: Power supply units and controllers are included.
3.19
illumination E
middle

average illumination of the lighting system on the cooking surface measured in lux under

standard conditions
4 Classification
According to the mode:
– recirculation mode;
– extraction mode.
A cooking fume extractor may be constructed to incorporate both modes.
5 List of measurements
Performance is determined by assessing the following:
– overall dimensions;
– mass;
– power measurement of low-power modes;
– airborne acoustical noise;
– volumetric airflow;
– effectiveness and electric power input of the lighting system;
– ability to reduce odours;
– ability to absorb grease.
6 General conditions for measurements
6.1 Test room

The tests are carried out in a draught-free room. The ambient temperature of the room is

maintained at (23 ± 2) °C. The absolute air pressure shall be between 913 hPa and 1 063 hPa.

6.2 Installation and positioning

The appliance has to be clean and free of any residues of packaging material and protective

foil. All tests have to be carried out following the order of the clauses of this document with one

and the same appliance.

The cooking fume extractor (except for the down-draft system) is installed above a cooking

appliance with the distance of (600 ± 10) mm. The distance is determined between the lowest

level of the cooking fume extractor and the highest level of the cooking appliance. The cooking

fume extractor is installed and operated in accordance with the manufacturer’s instructions

(except for the distance above the cooking appliance).
---------------------- Page: 11 ----------------------
– 10 – IEC 61591:2019 © IEC 2019

Any extendible visor, which is extendable for normal use in accordance with the manufacturer’s

instructions, shall be opened accordingly. If no instructions are given, the extendible visor is

fully opened.

If the down-draft system can be elevated, the manufacturer’s instructions are followed;

otherwise, it shall be measured in its maximum elevated position for use.

The maximum sized duct in accordance with the manfacturer’s instructions is to be used.

For all tests, the appliance is operated with unchanged default factory settings (e.g. brightness

of the display or changeable light colour). Supplementary parts that are part of the appliance

are mounted in accordance with the manufacturer’s instructions. Ensure that no network is

connected to the appliance for the duration of the measurement, except for the remote control.

Before the measurement is made, any conditioning of the cooking fume extractor, unless

explicitly required in this document, is not allowed.

Ensure that any automatic modes, where the fan speed is altered, are switched off.

6.3 Electricity supply
The cooking fume extractor is supplied at the rated voltage ±1 %.

If the appliance has a rated voltage range, the tests are carried out at the nominal voltage of

the country where the appliance is intended to be used.

The supply frequency shall be at the rated frequency ±1 % throughout the test. If a frequency

range is indicated, then the test frequency shall be that of the nominal frequency of the country

in which the appliance is intended to be used.
6.4 Filters
For all tests, it shall be ensured that all filters are positioned correctly.

For appliances with more than one grease filter, the filters shall be positioned with no gap in

between (centrally positioned).
6.5 Fan control

Cooking fume extractors shall be tested in the highest continuous setting for normal use,

as stated in the manufacturer’s instructions.
6.6 Instrumentation and measurements
Instruments used and measurements made for this document shall comply with the

specifications in Table 1 and Table 2. The accuracy is applied to the measured value.

---------------------- Page: 12 ----------------------
IEC 61591:2019 © IEC 2019 – 11 –
Table 1 – Instruments
Parameter Unit Minimum Accuracy Additional
resolution requirements
Mass g 0,1 g ±0,5 g
Temperature °C 0,1 °C ±1,5 K Thermocouple type J
or K in accordance
with
IEC 60584-1
PT100 sensor in
accordance with
IEC 60751.
Time s 1 s ±1 s
Power W - ±1 %
Illuminance lx ±10 % Value under
consideration –
International standard
about illuminance
classification is
pending.
Pressure/Air pressure Pa ±1 % The accuracy is for
pressures ≤ 150 Pa at
least 1,5 Pa.
Table 2 – Measurements
Parameter Unit Minimum Accuracy Additional
resolution requirements
Voltage V - ±0,5 % -
Volumetric airflow ±2 %
m /h
In accordance with
Power measurement - -
IEC 62301

If numbers have to be rounded, they shall be rounded to the nearest number in accordance with

ISO 80000-1:2009, B.3, Rule B. If the rounding takes place to the right of the comma, the

omitted places shall not be filled with zeros.
7 Dimensions and mass
7.1 Overall dimensions

The overall dimensions of the cooking fume extractor are measured. The longest width, depth

and height, including any control knobs or other projections, are stated in millimetres rounded

to 10 mm. If dimensions are variable while the cooking fume extractor is operated in normal

use, then the minimum and maximum sizes are stated.

For cooking fume extractors with extraction mode, the dimensions of the air-outlet orifice

are measured and stated.
7.2 Distance between cooking fume extractor and cooking appliance

The shortest distance between the lowest level of the cooking fume extractor, except down-

draft systems, and the highest level of the cooking appliance is measured and indicated in

millimetres, rounded to 10 mm.
---------------------- Page: 13 ----------------------
– 12 –
...

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