EN 61591:1997

SLOVENSKI STANDARD
01-februar-2001
Household range hoods - Methods for measuring performance
Household range hoods - Methods for measuring performance
Haushalt-Dunstabzugshauben - Verfahren zur Messung der Gebrauchseigenschaft
Hottes de cuisine à usage domestique - Méthodes de mesure de l'aptitude à la fonction
Ta slovenski standard je istoveten z: EN 61591:1997
ICS:
97.040.20 âWHGLOQLNLGHORYQLSXOWL Cooking ranges, working
SHþLFHLQSRGREQLDSDUDWL tables, ovens and similar
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

NORME
CEI
INTERNATIONALE
IEC
INTERNATIONAL
Première édition
STANDARD
First edition
1997-05
Hottes de cuisine à usage domestique –
Méthodes de mesure de l'aptitude
à la fonction
Household range hoods –
Methods for measuring performance
 IEC 1997 Droits de reproduction réservés  Copyright - all rights reserved
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International Electrotechnical Commission
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For price, see current catalogue

61591 © IEC:1997 – 3 –
CONTENTS
Page
FOREWORD . 5
Clause
1 Scope. 7
2 Normative reference . 7
3 Definitions . 7
4 Classification. 9
5 List of measurements . 9
6 General conditions for measurements. 9
7 Overall dimensions . 10
8 Maximum effective capture area . 11
9 Length of the supply cord. 11
10 Mass of the range hood . 11
11 Volumetric airflow. 11
12 Grease absorption. 13
13 Odour extraction. 15
14 Effectiveness of the hob light. 17
15 Maintenance. 17
16 Other features. 17
Figures
1 Measurement of airflow. 19
2 Pressure/air flow curve. 19
3 Arrangement for the grease absorption test. 21
4 Example of a test room . 23

61591 © IEC:1997 – 5 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
_________
HOUSEHOLD RANGE HOODS –
METHODS FOR MEASURING PERFORMANCE
FOREWORD
1) The IEC (International Electrotechnical Commission) is a worldwide organization for standardization comprising
all national electrotechnical committees (IEC National Committees). The object of the 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, the IEC publishes International Standards. 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. The 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 the 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 National Committees.
3) The documents produced have the form of recommendations for international use and are published in the form
of standards, technical reports or guides and they are accepted by the National Committees in that sense.
4) In order to promote international unification, IEC National Committees undertake to apply IEC International
Standards transparently to the maximum extent possible in their national and regional standards. Any
divergence between the IEC Standard and the corresponding national or regional standard shall be clearly
indicated in the latter.
5) The IEC provides no marking procedure to indicate its approval and cannot be rendered responsible for any
equipment declared to be in conformity with one of its standards.
6) Attention is drawn to the possibility that some of the elements of this International Standard may be the subject
of patent rights. The IEC shall not be held responsible for identifying any or all such patent rights.
International Standard IEC 61591 has been prepared by IEC technical committee 59:
Performance of household electrical appliances.
The text of this standard is based on the following documents:
FDIS Report on voting
59/171/FDIS 59/181/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.

61591 © IEC:1997 – 7 –
HOUSEHOLD RANGE HOODS –
METHODS FOR MEASURING PERFORMANCE
1 Scope
This International Standard applies to range hoods incorporating a fan for the recirculation or
forced removal of air from above a hob situated in a household kitchen.
This standard defines the main performance characteristics of range hoods and specifies
methods for measuring these characteristics, for the information of users.
This standard does not specify required values for performance characteristics.
NOTE – This standard does not deal with:
1)
– safety requirements (IEC 60335-2-31) ;
– acoustical noise.
2 Normative reference
The following normative documents contain provisions which, through reference in this text,
constitute provisions of this International Standard. At the time of publication, the editions
indicated were valid. All normative documents are subject to revision, and parties to
agreements based on this International Standard are encouraged to investigate the possibility
of applying the most recent editions of the normative documents indicated below. Members of
IEC and ISO maintain registers of currently valid International Standards.
ISO 5167-1: 1991, Measurement of fluid flow by means of pressure differential devices – Part 1:
Orifice plates, nozzles and Venturi tubes inserted in circular cross-section conduits running full
3 Definitions
For the purpose of this International Standard, the following definitions apply.
3.1 range hood: Appliance installed over a hob and through which air is passed to remove
contaminants from the room.
3.2 recirculating-air range hood: Range hood containing filters to remove contaminants
after which the cleaned air is discharged back into the room.
3.3 air-extraction range hood: Range hood which discharges the collected air to the outside
of the building by means of ducting.
3.4 rated voltage: Voltage assigned to the range hood by the manufacturer.
3.5 grease absorption factor: The percentage of grease retained within a filter.
3.6 odour reduction factor: The capability of the range hood to reduce odours.
3.7 odour dispersion time: Time taken to reduce odours to a defined level after the odour
generating source has been switched off.
__________
1)
Safety of household and similar electrical appliances – Part 2: Particular requirements for
IEC 60335-2-31:1995,
range hoods
61591 © IEC:1997 – 9 –
4 Classification
According to type:
– recirculating-air range hood;
– air-extraction range hood.
NOTE – A range hood may be constructed to incorporate both types.
5 List of measurements
Performance is determined by assessing the following:
– overall dimensions;
– maximum effective capture area;
– length of supply cord;
– mass;
– volumetric airflow;
– ability to absorb grease;
– ability to extract odours;
– effectiveness of hob light;
– maintenance;
– features.
6 General conditions for measurements
Unless otherwise specified, the measurements are made under the following conditions.
6.1 Test room
The tests are carried out in a substantially draught-free room. The ambient temperature of the
room is maintained at 20 °C ± 5 °C.
6.2 Installation
The range hood is installed in accordance with the manufacturer’s instructions.
6.3 Supply voltage
The range hood is supplied at the rated voltage ±1%.
If a voltage range is specified by the manufacturer the range hood is to be supplied at the
nominal voltage of the country in which the appliance is intended to be used. In this case the
test voltage has to be stated in the report.
6.4 Filters
The range hood is fitted with new filters for each test of clauses 12 and 13.
6.5 Fan control
The tests are carried out with any fan control adjusted to the highest setting for normal use.
NOTES
1 If a boost position is incorporated, this is not taken into account.
2 A boost position is a setting of a control for occasional use which results in a higher temporary fan speed.

61591 © IEC:1997 – 11 –
7 Overall dimensions
The overall dimensions of the range hood are measured. The length, depth and height,
including any control knobs or other projections, are stated in millimetres. The dimensions of
the range hood in the storage position are also measured if different.
For air-extraction range hoods, the diameter of the air-outlet orifice is measured and stated.
8 Maximum effective capture area
The overall length and depth of the projection of the area bounded by the horizontal outline of
the hood is measured and stated in millimetres. Any extendible visor is fully opened and the
increased area included in the dimensions.
9 Length of the supply cord
The distance between the points of entry of the cord into the range hood and the plug is
measured and stated in metres rounded downwards to the nearest 0,05 m.
It is stated if the range hood is for direct connection to the fixed wiring.
10 Mass of the range hood
The mass of the range hood, including any filters, supply cord and plug, is measured and
stated in kilograms, rounded upwards to the nearest 0,1 kg.
11 Volumetric airflow
The airflow is measured according to the method contained in ISO 5167-1.
The air outlet of the range hood is connected to a pressure compensation chamber (see figure 1).
The air then passes through an auxiliary fan and baffle. An orifice plate or other suitable device
is incorporated in order to measure the dynamic pressure for the calculation of airflow. Means
are provided for the measurement of static pressure in the compensation chamber.
The range hood is operated and by suitably adjusting the auxiliary fan or the baffle, the airflow
corresponding to various pressures can be determined.
The measurements are made with the controls positioned at the highest and lowest settings.
The airflow of recirculating-air range hoods is determined when the pressure in the
compensation chamber is at ambient pressure.
The airflow of air-extraction range hoods is determined for discharge into flues which have a
pressure drop of 15 Pa or 30 Pa when there is an airflow of 200 m /h.
NOTE 1 – A pressure/air flow curve is determined for the range hood under test.
Figure 2 shows the pressure/airflow curves for nominal flues, a typical curve for a range hood
and the derivations of airflow from it.

61591 © IEC:1997 – 13 –
The airflow is stated for the working points 1 or 2 for both of the fan speeds, adjusted to a
temperature of 20 °C and a pressure of 1013 hPa.
The airflow is stated in m /h.
NOTE 2 – Alternative working points corresponding to other pressure drops may be specified instead, in which
case the pressure drop has to be stated in the report.
12 Grease absorption
This test is used to measure the efficiency of the grease filter.
The mass of the range hood is measured without the grease filter and without the odour
extraction filter of recirculating-air range hoods. The mass of the grease filter is determined
separately, immediately after drying
...