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
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
10-May-2019
Due Date
15-Jul-2019
Completion Date
30-May-2019

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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
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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
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
Under preparation. Stage at time of publication: CCDV.
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SIST EN IEC 62966-1:2019
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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
– 4 – IEC 62966-1:2019 © IEC 2019

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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SIST EN IEC 62966-1:2019
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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– 6 – IEC 62966-1:2019 © IEC 2019

an environmentally-friendly use of resources, thereby relieving stress on the environment and

slowing down global warming by reduced CO emission.

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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– 8 – IEC 62966-1:2019 © IEC 2019
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

...

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