SIST EN IEC 62966-1:2019

Mechanical structures for electrical and electronic equipment - Aisle containment for IT cabinets - Part 1: Dimensions and mechanical requirements (IEC 62966-1:2019)

This part of IEC 62966 defines the dimensions and mechanical requirements of aisle
containment for information technology (IT) cabinets. The cabinets concerned are dealt with in
the standard series IEC 60297 and IEC 60917. The objective of this document is to stipulate
properties and requirements of aisle containment ensuring cost effective installation,
energy-efficient and user-friendly operation of IT equipment in data centres and server rooms.

Mechanische Bauweisen für elektrische und elektronische Einrichtungen – Gangeinhausung für IT-Schränke – Teil 1: Maße und mechanische Anforderungen (IEC 62966-1:2019)

Structures mécaniques pour équipements électriques et électroniques - Confinement d'allées pour les baies informatiques - Partie 1: Dimensions et exigences mécaniques (IEC 62966-1:2019)

IEC 62966-1:2019 définit les dimensions et les exigences mécaniques relatives au confinement d'allées pour les baies informatiques (IT). Les baies concernées sont couvertes par les séries de normes IEC 60297 et IEC 60917. L'objectif du présent document est de définir les propriétés et les exigences relatives au confinement d'allées afin de garantir une installation économique, un rendement énergétique et une exploitation pratique des équipements informatiques dans les salles de serveurs et les centres de traitement de données.
Mots clés: baies informatiques (IT), confinement d'allées

Mehanske strukture za električno in elektronsko opremo - Omejitev prehoda za IT-omarice - 1. del: Mere in mehanske zahteve (IEC 62966-1:2019)

Ta del standarda IEC 62966 opredeljuje mere in mehanske zahteve omejitve prehoda za IT-omarice. Zadevne omarice so obravnavane v skupinah standardov IEC 60297 in IEC 60917. Cilj tega dokumenta je določiti lastnosti in zahteve omejitve prehoda z zagotovitvijo ekonomične inštalacije, energetsko učinkovitega in uporabnikom prijaznega delovanja IT-opreme v podatkovnih centrih in strežniških sobah.

General Information

• Status: Published
• Publication Date: 29-May-2019
• ICS: 31.240 - Mechanical structures for electronic equipment
• Technical Committee: I11 - Imaginarni 11
• Current Stage: 6060 - National Implementation/Publication (Adopted Project)
• Start Date: 10-May-2019
• Due Date: 15-Jul-2019
• Completion Date: 30-May-2019
• Ref Project: EN IEC 62966-1:2019 - Mechanical structures for electrical and electronic equipment - Aisle containment for IT cabinets - Part 1: Dimensions and mechanical requirements

Standards Content (Sample)

SLOVENSKI STANDARD
SIST EN IEC 62966-1:2019
01-julij-2019
Mehanske strukture za električno in elektronsko opremo - Omejitev prehoda za IT-
omarice - 1. del: Mere in mehanske zahteve (IEC 62966-1:2019)
Mechanical structures for electrical and electronic equipment - Aisle containment for IT
cabinets - Part 1: Dimensions and mechanical requirements (IEC 62966-1:2019)
Mechanische Bauweisen für elektrische und elektronische Einrichtungen –
Gangeinhausung für IT-Schränke – Teil 1: Maße und mechanische Anforderungen (IEC
62966-1:2019)
Structures mécaniques pour équipements électriques et électroniques - Confinement
d'allées pour les baies informatiques - Partie 1: Dimensions et exigences mécaniques
(IEC 62966-1:2019)
Ta slovenski standard je istoveten z: EN IEC 62966-1:2019
ICS:
31.240 Mehanske konstrukcije za Mechanical structures for
elektronsko opremo electronic equipment
SIST EN IEC 62966-1:2019 en
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN IEC 62966-1:2019

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SIST EN IEC 62966-1:2019


EUROPEAN STANDARD EN IEC 62966-1

NORME EUROPÉENNE

EUROPÄISCHE NORM
April 2019
ICS 31.240

English Version
Mechanical structures for electrical and electronic equipment -
Aisle containment for IT cabinets - Part 1: Dimensions and
mechanical requirements
(IEC 62966-1:2019)
Structures mécaniques pour équipements électriques et Mechanische Bauweisen für elektrische und elektronische
électroniques - Confinement d'allées pour les baies Einrichtungen - Gangeinhausung für IT-Schränke - Teil 1:
informatiques - Partie 1: Dimensions et exigences Maße und mechanische Anforderungen
mécaniques (IEC 62966-1:2019)
(IEC 62966-1:2019)
This European Standard was approved by CENELEC on 2019-04-12. CENELEC members are bound to comply with the CEN/CENELEC
Internal Regulations which stipulate the conditions for giving this European Standard the status of a 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 CENELEC member.
This European Standard exists in three official versions (English, French, German). A version in any other language made by translation
under the responsibility of a CENELEC member into its own language and notified to the CEN-CENELEC Management Centre has the
same status as the official versions.
CENELEC members are the national electrotechnical committees of Austria, Belgium, Bulgaria, Croatia, Cyprus, the Czech Republic,
Denmark, Estonia, Finland, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,
Lithuania, Luxembourg, Malta, the Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden,
Switzerland, Turkey and the United Kingdom.


European Committee for Electrotechnical Standardization
Comité Européen de Normalisation Electrotechnique
Europäisches Komitee für Elektrotechnische Normung
CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CENELEC All rights of exploitation in any form and by any means reserved worldwide for CENELEC Members.
 Ref. No. EN IEC 62966-1:2019 E

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SIST EN IEC 62966-1:2019
EN IEC 62966-1:2019 (E)
European foreword
The text of document 48D/691/FDIS, future edition 1 of IEC 62966-1, prepared by SC 48D
"Mechanical structures for electrical and electronic equipment" of IEC/TC 48 "Electrical connectors
and mechanical structures for electrical and electronic equipment" was submitted to the IEC-
CENELEC parallel vote and approved by CENELEC as EN IEC 62966-1:2019.
The following dates are fixed:
• latest date by which the document has to be implemented at national (dop) 2020-01-12
level by publication of an identical national standard or by endorsement
• latest date by which the national standards conflicting with the (dow) 2022-04-12
document have to be withdrawn
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CENELEC shall not be held responsible for identifying any or all such patent rights.

Endorsement notice
The text of the International Standard IEC 62966-1:2019 was approved by CENELEC as a European
Standard without any modification.
In the official version, for Bibliography, the following notes have to be added for the standards
indicated:
IEC 60297-3-100 NOTE Harmonized as EN 60297-3-100
IEC 60297-3-101 NOTE Harmonized as EN 60297-3-101
IEC 60297-3-102 NOTE Harmonized as EN 60297-3-102
IEC 60297-3-103 NOTE Harmonized as EN 60297-3-103
IEC 60297-3-104 NOTE Harmonized as EN 60297-3-104
IEC 60297-3-105 NOTE Harmonized as EN 60297-3-105
IEC 60297-3-106 NOTE Harmonized as EN 60297-3-106
IEC 60297-3-107 NOTE Harmonized as EN 60297-3-107
IEC 60297-3-108 NOTE Harmonized as EN 60297-3-108
IEC 60297-3-109 NOTE Harmonized as EN 60297-3-109
IEC 60917-1 NOTE Harmonized as EN 60917-1
IEC 60917-2 NOTE Harmonized as EN 60917-2
IEC 60917-2-1 NOTE Harmonized as EN 60917-2-1
IEC 60917-2-2 NOTE Harmonized as EN 60917-2-2
IEC 60917-2-3 NOTE Harmonized as EN 60917-2-3
IEC 60917-2-4 NOTE Harmonized as EN 60917-2-4
IEC 60917-2-5 NOTE Harmonized as EN 60917-2-5
IEC 62610-2 NOTE Harmonized as EN IEC 62610-2

2

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SIST EN IEC 62966-1:2019
EN IEC 62966-1:2019 (E)
Annex ZA
(normative)

Normative references to international publications
with their corresponding European publications
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.
NOTE 1  Where an International Publication has been modified by common modifications, indicated by (mod), the relevant
EN/HD applies.
NOTE 2  Up-to-date information on the latest versions of the European Standards listed in this annex is available here:
www.cenelec.eu.

Publication Year Title EN/HD Year
IEC 61587-1 -  Mechanical structures for electronic EN 61587-1 -
equipment - Tests for IEC 60917 and IEC
60297 series - Part 1: Environmental
requirements, test set-up and safety
aspects for cabinets, racks, subracks and
chassis under indoor condition use and
transportation
IEC 61587-2 -  Mechanical structures for electronic EN 61587-2 -
equipment - Tests for IEC 60917 and
60297 - Part 2: Seismic tests for cabinets
and racks
1
IEC 62966-2 -  Mechanical structures for electrical and - -
electronic equipment - Aisle containment
for IT cabinets - Part 2: Details of air flow,
air separation and air cooling requirements





1
Under preparation. Stage at time of publication: CCDV.
3

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SIST EN IEC 62966-1:2019




IEC 62966-1

®


Edition 1.0 2019-03




INTERNATIONAL



STANDARD




NORME



INTERNATIONALE
colour

inside










Mechanical structures for electrical and electronic equipment – Aisle

containment for it cabinets –

Part 1: Dimensions and mechanical requirements




Structures mécaniques pour équipements électriques et électroniques –

Confinement d'allées pour les baies informatiques –


Partie 1: Dimensions et exigences mécaniques













INTERNATIONAL

ELECTROTECHNICAL

COMMISSION


COMMISSION

ELECTROTECHNIQUE


INTERNATIONALE




ICS 31.240 ISBN 978-2-8322-6614-4




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

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SIST EN IEC 62966-1:2019
– 2 – IEC 62966-1:2019 © IEC 2019
CONTENTS
FOREWORD . 3
INTRODUCTION . 5
1 Scope . 7
2 Normative references . 7
3 Terms and definitions . 7
4 Design of a containment . 8
4.1 Preferred arrangement setup of aisle containment . 8
4.2 Optional arrangement set up of aisle containment . 9
4.2.1 Arrangement of different sized cabinets for an aisle containment . 9
4.2.2 Arrangement for an aisle containment with building structure elements . 10
4.2.3 Aisle containment at walls of buildings . 11
4.3 Top cover elevation . 12
4.4 Adaptation of air flow orientation . 13
4.5 Air duct connection . 13
5 Requirements of containment . 14
5.1 Air tightness . 14
5.2 Stability. 15
5.3 Design of the ceiling of the aisle containment . 15
6 Aisle containment dimensions . 15
6.1 General . 15
6.2 Width of the aisle . 16
6.3 Dimensions of cabinets . 16
6.4 Height of the elevated aisle top cover . 17
Bibliography . 18

Figure 1 – Examples of an aisle containment . 6
Figure 2 – Preferred arrangement setup of an aisle containment . 9
Figure 3 – Possible arrangement of an aisle containment . 10
Figure 4 – Aisle containment with an integrated structural element . 11
Figure 5 – Top view of aisle containment with an integrated structural element not in
line with the cabinet front . 11
Figure 6 – Aisle containment at a wall of a building . 12
Figure 7 – Elevated aisle height . 13
Figure 8 – Aisle containment with an air duct . 14
Figure 9 – Dimensions at an aisle containment . 16

Table 1 – Aisle widths . 16
Table 2 – Cabinet height including plinth. 17
Table 3 – Cabinet widths . 17

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SIST EN IEC 62966-1:2019
IEC 62966-1:2019 © IEC 2019 – 3 –
INTERNATIONAL ELECTROTECHNICAL COMMISSION
____________

MECHANICAL STRUCTURES FOR
ELECTRICAL AND ELECTRONIC EQUIPMENT –
AISLE CONTAINMENT FOR IT CABINETS –

Part 1: Dimensions and mechanical requirements

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.
5) IEC itself does not provide any attestation of conformity. Independent certification bodies provide conformity
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 62966-1 has been prepared by subcommittee 48D: Mechanical
structures for electrical and electronic equipment, of IEC technical committee 48: Electrical
connectors and mechanical structures for electrical and electronic equipment.
The text of this International Standard is based on the following documents:
FDIS Report on voting
48D/691/FDIS 48D/698/RVD

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.

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SIST EN IEC 62966-1:2019
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A list of all parts in the IEC 62966 series, published under the general title Mechanical
structures for electrical and electronic equipment – Aisle containment for IT cabinets, can be
found on the IEC website.
The committee has decided that the contents of this document will remain unchanged until the
stability date indicated on the IEC website under "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.

IMPORTANT – The 'colour inside' logo on the cover page of this publication indicates
that it contains colours which are considered to be useful for the correct
understanding of its contents. Users should therefore print this document using a
colour printer.

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IEC 62966-1:2019 © IEC 2019 – 5 –
INTRODUCTION
Cabinets of the IEC 60297 and IEC 60917 standard series are used as enclosures of
electronical and electric equipment in many different fields of application. A wide field of
application is represented by enclosures equipped with electronic information technology (IT)
equipment. They are frequently set up in large numbers in server rooms and data centres.
During their operation, the electronic equipment installed generates a considerable amount of
heat that must be dissipated from the equipment by means of cooling air. Precise adjustment
of the supply air temperature and a sufficient cooling air flow are indispensable prerequisites
for the fail-safe operation of equipment in information technology.
Currently, it is common use in data centres and server rooms to set up cabinets in rows. The
server cabinets along the rows are usually arranged in such a way that surfaces with cold
supply air inlets face each other across an aisle, and surfaces with hot exhaust air outlets
also face each other across an aisle. This row configuration is generally known as hot
aisle/cold aisle configuration. Moreover, air is supplied and discharged exclusively via the
front and rear panels of the server cabinets, which are frequently perforated doors. It is
assumed that inside the IT equipment, the cooling air is moved in horizontal direction, taking it
in at the front and discharging it at the rear.
The required cooling air is provided by room air or row air conditioners. Warm exhaust air is
moved by fans usually through a fluid/air heat exchanger that cools it.
In the arrangement described, considerable quantities of cooling air pass by the IT equipment,
especially servers, which it is expected to cool, without having any cooling effect.
Concurrently, recirculation within and outside the cabinet causes hot exhaust air to be
absorbed as cooling air, which results in faulty operation. In order to minimize such
recirculation, more cooling air than required needs to be supplied, this adversely affects the
energy efficiency of the data centre.
The separation of air flows into enclosed air volumes consisting of either cold supply air or hot
exhaust air precludes recirculation to the largest possible extent (see Figure 1). Such
separation reduces the required cooling air flow because re-circulations are ruled out. Air flow
separation can reduce power consumption by the fans in the cooling units once fan speed
control fans are used.
Separation of the cold supply air from the hot exhaust air is achieved by covering the aisles of
the same temperature level with top cover elements, adding doors or similar design elements
to the end of the aisles, and all openings inside the cabinets at the front 482,6mm (19”) rails
shall be closed.
The installations of aisle containments in data centres and IT rooms shall not restrict the air
intake demands for the correct usage and operation of servers or other IT equipment.
Especially the required supply air temperature and the cooling air flow rate needed shall not
be affected by the aisle containment. This can improve the energy efficiency as most of the
cooling infrastructure has a higher efficiency with a higher difference between the air intake
and the air exhaust temperature.
The temperature difference between supply and exhaust air rises due to the reduced cooling
air volume. As the supply air temperature of the cooling air is usually specified, thus being
kept constant, an increase in the temperature difference results in an increase of the
temperature of the warm exhaust air. This has a positive impact on the temperature difference
to the temperature of ambient air, as the energy efficiency of the cooling of the building and
infrastructure is improved by the raised temperature gradient.
The period during which system cooling is required to be supported by a mechanical cooling
machine is reduced. Both the reduction of the cooling air flow and the reduction of times of
mechanical cooling lead to considerable reduction in the consumption of electrical power. This
effects significant savings in operating costs for data centres and server rooms. This results in

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an environmentally-friendly use of resources, thereby relieving stress on the environment and
slowing down global warming by reduced CO emission.
2
Part 1 of the standard series defines geometric dimensions and mechanical properties
ensuring undisturbed, energy-efficient and user-friendly operation of the data centre.
Part 2 defines characteristics and requirements of air separation, especially the air leakage rate,
and determines the air leakage rate. Besides, operational parameters are determined,
especially temperatures at which IT equipment in aisle containment are operated.
Part 3 deals with aspects of safely operating IT equipment in aisle containment, discussing
special fire-protection and fire-fighting issues. It also provides required specifications of the
doors for access to the aisle containment and possible access control.
In the past years, widely varying forms of aisle containment have been installed in server
rooms and data centres. This document is intended to provide confidence by reflecting and
structuring the currently most widely used solutions and catering for the energy-efficient
operation of IT equipment. This document is also expected to solve probable uncertainties and
problems concerning the containment technology
Cold aisle containment configuration
Top cover
Ceiling
Cabinets in rows
HOT HOT
COLD
HOT HOT
Raised floor
Door
COLD COLD
Concrete slab
Hot aisle containment configuration
Ceiling
HOT HOT
Ceiling
panel
Air duct
HOT
COLD COLD
Concrete slab
Cabinets in rows Door
IEC

Figure 1 – Examples of an aisle containment

CRAC
CRAC
CRAC
CRAC

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SIST EN IEC 62966-1:2019
IEC 62966-1:2019 © IEC 2019 – 7 –
MECHANICAL STRUCTURES FOR
ELECTRICAL AND ELECTRONIC EQUIPMENT –
AISLE CONTAINMENT FOR IT CABINETS –

Part 1: Dimensions and mechanical requirements



1 Scope
This part of IEC 62966 defines the dimensions and mechanical requirements of aisle
containment for information technology (IT) cabinets. The cabinets concerned are dealt with in
the standard series IEC 60297 and IEC 60917. The objective of this document is to stipulate
properties and requirements of aisle containment ensuring cost effective installation,
energy-efficient and user-friendly operation of IT equipment in data centres and server rooms.
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 61587-1, Mechanical structures for electronic equipment – Tests for IEC 60917 and
IEC 60297 series – Part 1: Environmental requirements, test set-up and safety aspects for
cabinets, racks, subracks and chassis under indoor condition use and transportation
IEC 61587-2, Mechanical structures for electronic equipment – Tests for IEC 60917 and
60297 – Part 2: Seismic tests for cabinets and racks
IEC 62966-2: Mechanical structures for electrical and electronic equipment – Aisle
containment for IT cabinets – Part 2: Details of air flow, air separation and air cooling
requirements (to be published)
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
aisle containment
physical containment mainly formed of IT cabinets arranged in parallel rows with a centre
aisle, a top cover across the aisle, doors or building structure at the ends of the aisle, and a
floor
Note 1 to entry: The main purpose is the cooling air guidance to the IT equipment and the avoidance of bypass air
and cooling air re-circulations.

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3.2
aisle width
nominal horizontal distance between the cabinet frames which are contained by the aisle
containment, whereas the referential vertical surface is oriented towards the interior of the
aisle
3.3
aisle height
vertical distance between the floor and the outside of the aisle containment top cover
3.4
aisle ceiling height
height clearance inside the aisle
3.5
aisle length
longest horizontal distance along the cabinets of the aisle arrangement
3.6
elevated aisle top cover height
difference between cabinet height and the vertical distance between the floor base of
installation and the top cover of the aisle containment
3.7
cooling air flow
air flow per time unit mainly moved horizontally through the IT equipment, removing heat
caused by ohmic loss in IT equipment by means of mass heat transfer from the equipment
Note 1 to entry: The cooling air flow may be related to mass as cooling air mass flow, but is usually related to
volume as cooling air volume flow.
3.8
supply air
cooling air prior to entering the cabinet mounted IT equipment, whose low temperature is
capable of absorbing heat from the equipment
3.9
exhaust air
heated cooling air after leaving the cabinet mounted IT equipment, which, due to an increase
in temperature, is discharging heat from the equipment
4 Design of a containment
4.1 Preferred arrangement setup of aisle containment
When setting up aisle containment, the cabinets for receiving IT equipment are arranged in
rows. The cabinets along the rows are oriented in such a way that the surfaces with supply air
inlets and those with exhaust air outlets face each other respectively, thus forming an aisle
(see Figure 2). These surfaces are usually formed by perforated doors of the cabinets. The air
flow inside the cabinets along the row of cabinets is similarly oriented. This arrangement is
known as hot aisle/cold aisle arrangement, and is widely used.
In some cases, older data centres are still arranged in foot print patterns where surfaces with
supply air inlets face surfaces with exhaust air outlets. Such arrangement with a similarly
oriented air flow in each row of cabinets is not suited for being enclosed by aisle containment.
Both ends of cabinet rows in aisle containment are formed by doors or other structural
elements that are suitable for reliably separating the air flow into supply air and exhaust air.

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IEC 62966-1:2019 © IEC 2019 – 9 –
The aisle containment is set up on a raised floor or solid ground. For the proper functioning of
the aisle containment, air flow separation between supply and exhaust air shall be guaranteed
between the floor and the cabinet. Likewise, the aisle top cover shall provide the separation
between supply and exhaust air. Thus the aisle is contained by cabinets at its long sides, by
doors at its front faces, by the floor from below and by the top cover from above.
The length of the containment is determined by the number of cabinets to be integrated into
the containment. Thereby, it is deemed economical not to design the length of the aisle too
short. Too long an aisle is regarded counter-productive to user-friendly operation. Princi
...