EN ISO 23953-2:2005/A1:2012

SLOVENSKI STANDARD
01-julij-2012
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Refrigerated display cabinets - Part 2: Classification, requirements and test conditions -
Amendment 1 (ISO 23953-2:2005/Amd 1:2012)
Verkaufskühlmöbel - Teil 2: Klassifizierung, Anforderungen und Prüfbedingungen -
Änderung 1 (ISO 23953-2:2005/Amd 1:2012)
Meubles frigorifiques de vente - Partie 2: Classification, exigences et méthodes d'essai -
Amendement 1 (ISO 23953-2:2005/Amd 1:2012)
Ta slovenski standard je istoveten z: EN ISO 23953-2:2005/A1:2012
ICS:
97.130.20 Hladilne naprave za trgovine Commercial refrigerating
appliances
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
EN ISO 23953-2:2005/A1
NORME EUROPÉENNE
EUROPÄISCHE NORM
February 2012
ICS 97.130.20
English Version
Refrigerated display cabinets - Part 2: Classification,
requirements and test conditions - Amendment 1 (ISO 23953-
2:2005/Amd 1:2012)
Meubles frigorifiques de vente - Partie 2: Classification, Verkaufskühlmöbel - Teil 2: Klassifizierung, Anforderungen
exigences et méthodes d'essai - Amendement 1 (ISO und Prüfbedingungen - Änderung 1 (ISO 23953-
23953-2:2005/Amd 1:2012) 2:2005/Amd 1:2012)
This amendment A1 modifies the European Standard EN ISO 23953-2:2005; it was approved by CEN on 14 February 2012.

CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for inclusion of this
amendment into the relevant national standard without any alteration. Up-to-date lists and bibliographical references concerning such
national standards may be obtained on application to the CEN-CENELEC Management Centre or to any CEN member.

This amendment exists in three official versions (English, French, German). A version in any other language made by translation under the
responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management Centre has the same status as the
official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2012 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN ISO 23953-2:2005/A1:2012: E
worldwide for CEN national Members.

Contents Page
Foreword .3
Foreword
This document (EN ISO 23953-2:2005/A1:2012) has been prepared by Technical Committee CEN/TC 44
“Commercial refrigerated cabinets, catering refrigerating appliances and industrial refrigeration", the
secretariat of which is held by UNI, in collaboration with Technical Committee ISO/TC 86 "Refrigeration and
air-conditioning".
This European Standard shall be given the status of a national standard, either by publication of an identical
text or by endorsement, at the latest by August 2012, and conflicting national standards shall be withdrawn at
the latest by August 2012.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights.
According to the CEN/CENELEC Internal Regulations, the national standards organizations of the following
countries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech
Republic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,
Sweden, Switzerland, Turkey and the United Kingdom.
INTERNATIONAL ISO
STANDARD 23953-2
First edition
2005-10-15
AMENDMENT 1
2012-02-15
Corrected version
2012-04-15
Refrigerated display cabinets —
Part 2:
Classification, requirements and test
conditions
AMENDMENT 1
Meubles frigorifiques de vente —
Partie 2: Classification, exigences et méthodes d'essai
AMENDEMENT 1
Reference number
ISO 23953-2:2005/Amd.1:2012(E)
©
ISO 2012
ISO 23953-2:2005/Amd.1:2012(E)

©  ISO 2012
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized in any form or by any means,
electronic or mechanical, including photocopying and microfilm, without permission in writing from either ISO at the address below or
ISO's member body in the country of the requester.
ISO copyright office
Case postale 56  CH-1211 Geneva 20
Tel. + 41 22 749 01 11
Fax + 41 22 749 09 47
E-mail copyright@iso.org
Web www.iso.org
Published in Switzerland
ii © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Foreword
ISO (the International Organization for Standardization) is a worldwide federation of national standards bodies
(ISO member bodies). The work of preparing International Standards is normally carried out through ISO
technical committees. Each member body interested in a subject for which a technical committee has been
established has the right to be represented on that committee. International organizations, governmental and
non-governmental, in liaison with ISO, also take part in the work. ISO collaborates closely with the
International Electrotechnical Commission (IEC) on all matters of electrotechnical standardization.
International Standards are drafted in accordance with the rules given in the ISO/IEC Directives, Part 2.
The main task of technical committees is to prepare International Standards. Draft International Standards
adopted by the technical committees are circulated to the member bodies for voting. Publication as an
International Standard requires approval by at least 75 % of the member bodies casting a vote.
Attention is drawn to the possibility that some of the elements of this document may be the subject of patent
rights. ISO shall not be held responsible for identifying any or all such patent rights.
Amendment 1 to ISO 23953-2:2005 was prepared by the European Committee for Standardization (CEN)
Technical Committee CEN/TC 44, Commercial refrigerated cabinets, catering refrigerating appliances and
industrial refrigeration, in collaboration with Technical Committee ISO/TC 86, Refrigeration and air-
conditioning, Subcommittee SC 7, Testing and rating of commercial refrigerated display cabinets, in
accordance with the Agreement on technical cooperation between ISO and CEN (Vienna Agreement).
This corrected version of ISO 23953-2:2005/Amd.1:2012 incorporates the following correction on page 3:
Page 14, Figure 3
Replace Figure 3 with the following new Figure 2 a), b), c) and d).
has been corrected to read:
Page 14, Figure 3
Renumber Figure 3 as Figure 2.

ISO 23953-2:2005/Amd.1:2012(E)

Refrigerated display cabinets —
Part 2:
Classification, requirements and test conditions
AMENDMENT 1
Page 6, 4.1.4.1
Replace “the maximum working pressure to which they will be subjected when the cabinet is in operation or at
rest.” with “the maximum working pressure to which they are subjected when the cabinet is in operation or at
rest.”
Page 7, 4.1.6.2
Replace the subclause with the following:
4.1.6.2 Temperature sensor location
The temperature sensor location shall be readily accessible to enable on-site testing for the correct
indication of temperature and replacement of the temperature measuring instrument on site in service.
NOTE 1  The temperature sensor of a thermometer is considered to be “readily accessible” if it can be reached
directly for examination. It can be necessary to remove access panel(s) to carry out replacement.
NOTE 2  For cabinets with natural convection cooling, the positioning of the temperature sensor in a guide tube is
also considered to be “readily accessible” if the sensor can be introduced into and removed from the guide tube
without a tool.
Wherever possible, the mounting method shall not supply heat to, or withdraw heat from, the temperature
sensor.
The temperature sensor shall be protected against heat radiation from the external ambient.
The temperature sensor's location is defined as part of the temperature test of the refrigerated display
cabinet. During the temperature test, air temperatures at the declared sensor location shall be measured
and these values noted in the test report.
NOTE 3  For electronic controllers, it is possible to display a calculated temperature.
NOTE 4  For the recording and display of temperatures, one or two temperature sensors can be used. The
temperature sensor can be the same as those used for controlling the refrigeration. An alarm can be activated in
case of error. This option is not in accordance with the requirements of EN 12830.
NOTE 5  It is the responsibility of the supplier and user to ensure that the location of the temperature sensor
complies with national regulation on temperature control of foodstuffs.
Page 8, Figure 2
Delete Figure 2.
ISO 23953-2:2005/Amd.1:2012(E)
Page 9, 4.2.2
Replace the Note with the following:
NOTE   Annex B compares laboratory and store condition.
Page 9, Table 1
Replace the table with the following:
Table 1 — M-package temperature classes
Class Highest temperature,  , of Lowest temperature,  , of Lowest temperature,  , of

ah b al
warmest M-package colder coldest M-package warmer all M-package colder than
a a a
than or equal to than or equal to or equal to
°C
L1 15 — 18
L2 12 — 18
L3 —
12 15
M1 —
5 1
M2 7 1 —
H1 10 1 —
H2 —
10 1
S Special classification
a
See Figure 28.
Page 10, Table 2
In the third row of the table, replace “Annex D” with “Annex C”.
Page 11, 5.2.2
Replace the fourth and final paragraph with the following:
The total display (TDA) area is calculated according to Annex A.
2 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Page 13, Table 3
Replace the table with the following:
Table 3 — Climate classes
Test room climate Dry bulb temperature Relative humidity Dew point Water vapour
class mass in dry air
°C % °C g/kg
0 20 50 9,3 7,3
1 16 80 12,6 9,1
8 23,9 55 14,3 10,2
2 22 65 15,2 10,8
3 25 60 16,7 12,0
4 30 55 20,0 14,8
6 27 70 21,1 15,8
5 40 40 23,9 18,8
7 35 75 30,0 27,3
NOTE The water vapour mass in dry air is one of the main points influencing the performance and the energy consumption of the
cabinets. Therefore, the order of the climate class in the table is based on the water vapour mass column. See also Annex B to compare
lab and store conditions.
Page 13, 5.3.1.3.2
Replace the first paragraph with the following:
The point for measurement of ambient temperature and relative humidity shall be midway along the
length of the cabinet and in accordance with Figures 2 to 5.
In the case of typical island cabinets, and island with air discharge in the middle, temperatures shall be
taken at both sides [see Figure 3 a), b), c)].
For plug-in cabinets, the warm condenser air flow shall be prevented from influencing the temperature at
the measuring point by air deflectors or other suitable means (see 5.3.2.1, Figure 10).

Page 14, Figure 3
Renumber Figure 3 as Figure 2.

ISO 23953-2:2005/Amd.1:2012(E)
Page 15, Figure 4
Replace Figure 4 with the following new Figure 3 a), b), c) and d):
a) Horizontal, open, island site cabinet b) Horizontal, open, island site cabinet

c) Island with air discharge in the middle
Figure 3 (continued)
4 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)

d) Island with semi-vertical cabinet
Figure 3 — Climate measuring point for two typical examples of horizontal, open, island site
cabinets [a), b)] for island with air discharge in the middle [c)] and for semi-vertical cabinet [d)]
Pages 15 and 16, Figures 5 and 6
Renumber Figures 5 and 6 as Figures 4 and 5.
Page 16, Table 4
Replace the last row with the following (thus deleting the dimension and mass of test packages
“(37,5  100  200)  750”:
The following package may be used as fillers to complete the cabinet loading:
25  100  200 500
Page 18, Figure 7
Renumber Figure 7 as Figure 6.
Page 20, Figure 8
Renumber Figure 8 as Figure 7.
ISO 23953-2:2005/Amd.1:2012(E)
Page 20, 5.3.1.6
Insert the following new subclause after renumbered Figure 8 (M-package):
5.3.1.6 Alternative for filling test packages
Alternative filling test packages having the dimensions shown in Table 4 and density of (480  80) kg/m
may be used, except for rows and columns on transverse section containing M-packages.
This test package may be a box made of plastic material, of any density, and of 1 mm nominal thickness.
Cellular or foam material shall not be used. The case shall not incorporate any protrusions that would
cause the vertical separation of packages in a stack. Opposite faces shall be substantially parallel and
moulding draft shall be the minimum practicable. Seams or joints shall not result in protrusions sufficient
to cause significant air gaps between adjacent packages.
Colour can be important, if dark enough to be affected by ambient heat radiation; however, a pastel
colour, such as light pink, pale blue or pale green, shall have no significant effect in normal surroundings.
The contents shall be water soaked into a porous material, such as a natural, plastics or cellulose sponge.
Table 7 — Temperature and specific enthalpy of filler packages
Temperature Specific enthalpy
°C kJ/kg
5 0
4 3
3 4
2 7
1 10
0 45
1
2
3
4
5
Table 8 — Temperature and increase in specific enthalpy of filler packages
Temperature range Increase in specific enthalpy
°C kJ/kg
5 to 1 10
1 to 1 162
1 to 5 46
5 to 5
6 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)

Key
X temperature, °C
Y specific enthalpy, kJ/kg
Figure 8 — Thermal characteristics of filler packages
Page 20, 5.3.1.6
Renumber 5.3.1.6 as 5.3.1.7.
Page 21, 5.3.2.1
Replace the fourth paragraph with the following:
For cabinets intended to be placed against a wall, and in order to check the running of cabinets with
incorporated condensing unit correctly according to 5.3.2 or the water vapour condensation according to
5.3.4, a vertical partition shall be placed either against the rear of the cabinet or at a distance, d , from the
p
rear as specified by the manufacturer [see Figure 9 and 7.3 b)].
Add the following two paragraphs and new Figure 10 at the end of the subclause:
For all vertical and semi-vertical cabinets, when the warm condenser air flow direction is across the
testing room air flow direction, from the front to the back of the cabinet, an air deflector positioned as
shown in Figure 10 shall be used in such a way to create a duct between the back of the cabinet and the
vertical panel. This duct shall be closed in the front end side towards the testing room airflow discharge
direction and open in the opposite side. On the top, this duct shall be closed at the same height of the
cabinet.
The distance, d , between the back of the cabinet and the vertical panel shall be specified by the
p
manufacturer [see 7.3 b)].
ISO 23953-2:2005/Amd.1:2012(E)

Key
d depth of the air back duct
p
H height of the air back duct equals height of the cabinet
L length of the air back duct equals length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
Figure 10 — Size and position of the air back duct
For horizontal plug-in cabinets, a back duct is not required.
NOTE   In general, the power of horizontal cabinets is much lower than that of vertical cases.
The warm condenser air can be removed by the test room airflow.
The air movement of the test room shall be parallel to the longitudinal axis according to 5.3.2.2.
The direction of the warm condenser airflow should be the same as the test room air flow direction and
not opposed to it.
If this is not possible because of the cabinet's design, the condenser airflow should be across the test
room airflow direction (see Figure 11).
8 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)

Key
1 M-package
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Air flow direction of condensing unit.
Figure 11 — Condensing air with test room air flow, or across, but not opposed
the test room air flow
Page 22, 5.3.2.2
At the end of the first paragraph, replace “shown in Figure 10 shall be 0,2 m/s” with “shown in Figure 12 shall
0
be 0,2 m/s ”.
0,1
Page 23, 5.3.2.2
Replace the second and third paragraphs with the following:
For closed refrigerated cabinets with lids or doors hinged in such a way that the rotation axis is
perpendicular to the longitudinal axis of the cabinet, the direction of air flow shall be such that the air
movement is parallel to the plane of the cabinet display opening and the air enters the cabinet when the
door(s) or lid(s) is (are) open.
The majority of the doors or lids shall open in order to allow the air entry into the cabinet; if doors or lids
can be indifferently hinged left and right, all doors or lids shall open in the same direction.
Test room air movement shall be checked during the test in order to be sure that the test room is running
correctly. The method of checking is left to the discretion of the testing authority.
ISO 23953-2:2005/Amd.1:2012(E)
Page 23, Figure 10
Renumber Figure 10 as Figure 12.
Page 24, 5.3.2.3.1
Replace in the first sentence “up to the load limit, as illustrated in Figures 11 to 24” with “up to the load limit,
as illustrated in Figures 13 to 26”.
Replace the fourth paragraph with the following (thus deleting the “37,5 mm  100 mm  200 mm” size):
To complete the loading, use test packages of the following size as fillers: 25 mm  100 mm  200 mm.
In the first sentence of the eleventh paragraph, before the Example, replace “loading height above 500 mm
(see Figure 23)” with “loading height above 500 mm (see Figure 25)”.
Add the following two paragraphs and Note at the end of the subclause:
If not otherwise stated in the manufacturer's handbook/instructions or marked inside the cabinet, the
packages and the wood shall be loaded on standard Euro pallets (1 200  800  144) mm or, if not
applicable, on a similar tray of the same height. The surface of the pallet should be covered by a sheet of
plastic or carton so that the packages can be loaded properly.
If the cabinet is designed for the use of special storage trolleys, these trolleys shall be used for testing. In
this case, the M-packages shall be positioned as specified in Figure 25, but inside the trolleys.
NOTE   Sensitive foodstuff loading type can be possible only for the top part (shelves) of this type of cabinet.
Page 24, 5.3.2.3.2 a)
 0 0
Replace “a tolerance of mm (see Figure 11 and Figures 13 to 18)” with “a tolerance of mm (see
25
15
Figure 13 and Figures 15 to 20)”.
Page 24, 5.3.2.3.2 b)
Replace “(see Figures 19 to 21 and Figure 23)” with “(see Figures 21 to 23 and Figure 25)”.
Page 24, 5.3.2.3.2 c)
Replace the text with the following:
c) For all open cabinets, intended for sensitive foodstuffs not suitable for multiple layer stacking, the
loading shall be equal to 100 mm (for an example, see Figures 14 and 24).
NOTE   The meaning of “intended for sensitive foodstuffs not suitable for multiple layer stacking” is that the
foodstuffs are displayed on tilted shelves, where it is not possible to make a load level over 100 mm. This type of
loading can also be used for horizontal shelves. It is intended that manufacturers indicate the load limit in the
technical documentation and also specify the type of loading used for testing the cabinet.
Page 25, 5.3.2.3.2 d)
Replace “(see Figure 24)” with “(see Figure 26)”.
10 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Page 25, 5.3.2.3.3
Replace “(see Figures 11 to 24)” with “(see Figures 15 to 26)” at the end of the sentence.
Page 25, 5.3.2.3.3.2
Replace the text with the following:
5.3.2.3.3.2 Cross-section
For refrigerated base deck depths of less than or equal to 550 mm, or any shelf depth, M-packages shall
be located in two longitudinal sections, such that the M-package axis is situated 50 mm from the back
panel and 50 mm from the front limit of loading (see Figures 13 to 26).
For refrigerated base deck depths of more than 550 mm, a third longitudinal section shall be placed
midway across the base deck depth with a tolerance of
100
 d /2 mm from the air-discharge side for cabinets with forced-air cooling [see Figures 13 to 15,
0
Figure 17 a) and b) and Figures 21 to 25], or
 d/2  50 mm for natural-convection-cooled cabinets equipped with two evaporators or having a
symmetrical layout (see Figures 18 to 20), or
100
 d /2 mm from the evaporator side for other natural-convection-cooled cabinets (see Figure 16).
0
In the height, for the base deck and each refrigerated shelf, M-packages shall be located in the lower and
upper loading layers. Where the distance between the axes of M-packages is more than 400 mm, another
M-package layer shall be introduced (see Figures 22, 23 and 25).
For cabinets with a minimum of four superimposed refrigerated shelves, of which two are strictly identical
and have
a) the same shape and sizes (length, depth and loading height),
b) the same air flow design (discharge and return), and
c) the same radiation heat transfer conditions, more particularly, the same location and intensity of the
lower and upper lighting devices,
M-packages shall be located in the following places:
 with two identical refrigerated shelves: on the lower shelf (see Figure 22, where the second and the
third shelves from the top are identical);
 with three identical refrigerated shelves: on the central shelf (see Figures 23 and 26, where the
second, third and fourth shelves from the top are identical).
ISO 23953-2:2005/Amd.1:2012(E)
Page 26, Figure 11
Replace Figure 11 with the following and renumber it as Figure 13:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
h height at load limit
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Direction of forced air flow.
Figure 13 — Self-service counter provided with forced air cooling (horizontal, open)
12 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Page 27, Figure 12
Replace the key and title with the following:
Key
1 M-package
d depth of base deck
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Direction of forced air flow.
Figure 12 — Self-service counter provided with forced air cooling for sensitive foodstuffs
(horizontal, open)
Renumber Figure 12 as Figure 14.
ISO 23953-2:2005/Amd.1:2012(E)
Page 28, Figure 13
Replace Figure 13 with the following and renumber Figure 13 as Figure 15:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Direction of forced air flow.
Figure 15 — Serve-over counter provided with forced air cooling (horizontal)

14 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Page 29, Figure 14
Replace Figure 14 with the following and renumber Figure 14 as Figure 16:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Direction of forced air flow.
Figure 16 — Serve-over counter provided with natural convection cooling (horizontal)

ISO 23953-2:2005/Amd.1:2012(E)
Page 30, Figure 15
Renumber Figure 15 as Figure 17, and replace it with the following Figures 17 a) and b):
Dimensions in millimetres
a) Open island cabinet provided with forced air cooling (horizontal, open)
Figure 17 (continued)
16 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Dimensions in millimetres
b) Island cabinet with air discharge in the middle
Key
1 M-package
d depth of base deck
h height at load limit
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Direction of forced air flow.
Figure 17 — Open island cabinet provided with forced air cooling (horizontal, open) and island
with air discharge in the middle

ISO 23953-2:2005/Amd.1:2012(E)
Page 31, Figure 16
Replace Figure 16 with the following and renumber Figure 16 as Figure 18:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
h height at load limit
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
Figure 18 — Open island cabinet provided with natural convection cooling (horizontal, open)
18 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Page 32, Figure 17
Replace Figure 17 with the following and renumber Figure 17 as Figure 19:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
h height at load limit
l length of the cabinet
Figure 19 — Glass lid, island cabinet with flat base deck with and without tubes laid at the base
(horizontal, closed)
ISO 23953-2:2005/Amd.1:2012(E)
Page 33, Figure 18
Replace Figure 18 with the following and renumber Figure 18 as Figure 20:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
h height at load limit
l length of the cabinet
Figure 20 — Glass lid, island cabinet with stepped base deck with and without tubes laid at the base
(horizontal, closed)
20 © ISO 2012 – All rights reserved

ISO 23953-2:2005/Amd.1:2012(E)
Page 34, Figure 19
Replace Figure 19 with the following and renumber Figure 19 as Figure 21:
Dimensions in millimetres
Key
1 M-package
d depth of base deck
h height at load limit
l length of the cabinet
a
Air currents parallel to the plane of the opening (in longitudinal direction).
b
Direction of forced air flow.
Figure 21 — Semi-vertical cabinet provided with forced air cooling (vertical, open)

ISO 23953-2:2005/Amd.1:2012(E)
Page 35, Figure
...