EN 1335-1:2020

Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions

This part of prEN 1335:2017 applies to office work chairs. It specifies dimensions of three types of chairs as well as test methods for their determination.
Annex A (informative) contains a Rationale for office chair features and comparison between current published dimensions with European anthropometric data.

Büromöbel - Büro-Arbeitsstuhl - Teil 1: Maße - Bestimmung der Maße

Dieses Dokument legt die Maße für vier Typen von Büro-Arbeitsstühlen und Prüfverfahren für deren Bestimmung fest.
Es ist nicht anwendbar für Kindersitze, für die eine Europäische Norm existiert.
Anhang A (informativ) enthält die Grundlagen für die Bestimmung der Büro-Arbeitsstuhlmaße.
Anhang B (informativ) enthält ein Beispiel für die Anwendung der Tabelle 2.
Anhang C (informativ) enthält Vorschläge für Maße von Kopfstützen.
Anhang D (informativ) enthält die Messunsicherheit.

Mobilier de bureau - Sièges de travail de bureau - Partie 1 : Dimensions - Détermination des dimensions

Le présent document spécifie les dimensions de quatre types de sièges de travail de bureau, ainsi que les méthodes de mesure correspondantes.
Il ne s’applique pas aux sièges pour enfants, pour lesquels une Norme européenne existe.
L’Annexe A (informative) contient des justifications relatives aux dimensions des sièges de bureau.
L’Annexe B (informative) inclut un exemple pour clarifier l’utilisation du Tableau 2.
L’Annexe C (informative) comprend des propositions pour les dimensions des repose-tête.
L’Annexe D (informative) indique les incertitudes de mesure.

Pisarniško pohištvo - Pisarniški delovni stoli - 1. del: Mere - Ugotavljanje mer

General Information

• Status: Withdrawn
• Publication Date: 21-Apr-2020
• Withdrawal Date: 13-Apr-2025
• ICS: 97.140 - Furniture
• Technical Committee: CEN/TC 207 - Furniture
• Drafting Committee: CEN/TC 207/WG 3 - Thermal insulation of building equipment and industrial installations - Procedure for the determination of reference thermal conductivity of products - Revision
• Current Stage: 9960 - Withdrawal effective - Withdrawal
• Start Date: 16-Nov-2022
• Completion Date: 14-Apr-2025
• Ref Project: SIST EN 1335-1:2020 - Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions

Relations

• Replaces: EN 1335-1:2000 - Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions
• Effective Date: 08-Jun-2022
• Replaces: EN 1335-1:2000/AC:2002 - Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions
• Effective Date: 11-May-2020
• Merged Into: EN 1335-1:2020+A1:2022 - Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions
• Effective Date: 18-Jan-2023
• Amended By: EN 1335-1:2020/FprA1 - Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions
• Effective Date: 11-Nov-2020

Standards Content (Sample)

SLOVENSKI STANDARD
01-julij-2020
Nadomešča:
SIST EN 1335-1:2001
SIST EN 1335-1:2001/AC:2003
Pisarniško pohištvo - Pisarniški delovni stoli - 1. del: Mere - Ugotavljanje mer
Office furniture - Office work chair - Part 1: Dimensions - Determination of dimensions
Büromöbel - Büro-Arbeitsstuhl - Teil 1: Maße - Bestimmung der Maße
Mobilier de bureau - Sièges de travail de bureau - Partie 1: Dimensions - détermination
des dimensions
Ta slovenski standard je istoveten z: EN 1335-1:2020
ICS:
97.140 Pohištvo Furniture
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1335-1
EUROPEAN STANDARD
NORME EUROPÉENNE
April 2020
EUROPÄISCHE NORM
ICS 97.140 Supersedes EN 1335-1:2000
English Version
Office furniture - Office work chair - Part 1: Dimensions -
Determination of dimensions
Mobilier de bureau - Sièges de travail de bureau - Büromöbel - Büro-Arbeitsstuhl - Teil 1: Maße -
Partie 1 : Dimensions - Détermination des dimensions Bestimmung der Maße
This European Standard was approved by CEN on 27 January 2020.

CEN 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 CEN
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 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, Republic of North Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and
United Kingdom.
EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2020 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1335-1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 4
1 Scope . 5
2 Normative references . 5
3 Terms and definitions . 5
4 Definitions of measurements . 7
5 Measurement conditions . 7
5.1 General . 7
5.2 Decision rule for measurement uncertainty . 7
6 Test equipment including CMD . 7
7 Measurement methods and procedures . 7
8 Dimensional requirements. 12
9 Information for use . 17
10 Test report . 17
Annex A (informative) Rationale for determination of office chair dimensions: comparison
of current published dimensions with European anthropometric data . 18
Annex B (informative) Example of how to read Table 2 . 27
Annex C (informative) Dimensions of neck rests and headrests . 28
Annex D (informative) Measurement uncertainty . 29
Bibliography . 30

European foreword
This document (EN 1335-1:2020) has been prepared by Technical Committee CEN/TC 207 “Furniture”,
the secretariat of which is held by UNI.
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 month year of DOP, and conflicting national standards
shall be withdrawn at the latest by month year of DOW.
Attention is drawn to the possibility that some of the elements of this document may be the subject of
patent rights. CEN shall not be held responsible for identifying any or all such patent rights.
This document supersedes EN 1335-1:2000.
Compared to EN 1335-1:2000, the following changes have been made:
— new test method of measurements based on ISO 24496;
— introduction of new chair type (Type Ax) to cover a wider range of the population than Type A chair;
— dimensional requirements moved from Annex to main part of standard;
— introduction of a new Annex A which gives a rationale for chair dimensions;
— introduction of a new Annex B which gives an example of “how to use” Table 2;
— introduction of a new Annex C which gives dimensions of neck rests and headrests;
— introduction of a new Annex D which gives measurement uncertainty;
— deletion of A-deviations.
According to the CEN-CENELEC Internal Regulations, the national standards organisations 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, Republic of North
Macedonia, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland, Turkey and the United
Kingdom.
Introduction
0.1 General working condition
The working conditions and the protection of office workers with respect to safety and health
necessitates that these standards take ergonomic principles and minimum requirements into account.
This applies in particular to the design of Visual Display Equipment (VDU) workstations where EU
Directive (90/270/EEC) has been implemented. These workstations should be designed to allow
different users to carry out a variety of work tasks.
0.2 Basis of dimensions and chair types
The dimensions in this document are based on anthropometric measurements, mechanical design
subjective preference and other factors.
The aim of this document is to provide dimensions for the office work chairs which can accommodate a
larger part of the European population. Due to the wide variation in population heights and other body
dimensions, there will be a variation of the office population between each country, which the dimensions
will accommodate. People with body dimensions outside this range may need furniture of different
dimensions or adaptations to existing workstations e.g. a footrest.
In this document , office work chairs are categorized into types of chairs based on dimensional
requirements.
Type Ax and Type A chairs have more adjustability with a greater range of adjustments than Type B and
Type C chairs.
Annex A (Rationale) of this document gives the rationale for chair dimensions and information regarding
the importance of good fit between the user and the chair.
0.3 Design reference seating posture
In order to articulate acceptable requirements for comfort and performance with respect to body
dimensions, it is important to specify a design reference posture for purposes of specifying
anthropometric data. While empirical evidence has indicated that the posture so specified could be
comfortable for users carrying out certain tasks over short periods, it does not represent the optimum
posture or the posture to strive for.
The reference seating posture is as follows:
— The sole of the foot is placed on the floor;
— The foot forms an angle of approximately 90° with the lower leg;
— The lower leg is approximately vertical;
— The lower leg forms an angle of approximately 90° with the thigh;
— The thigh is almost horizontal;
— The thigh forms an angle of approximately 90° with the trunk;
— The trunk is erect.
0.4 Seating postures
The purpose of well-designed seating is to provide stable support which allows movement, comfort, and
task accomplishment. Together with job content and the design of other furniture elements, seating
design plays an important role in encouraging movement. Thus, seat design should allow frequent
postural variation by the user in order to avoid muscle stress and circulatory problems.
1 Scope
This document specifies the dimensions of four types of office work chairs as well as test methods for
their determination.
It does not apply to seating for children for which a European Standard exists.
Annex A (informative) contains a rationale for office chair dimensions.
Annex B (informative) contains an example to clarify the use of Table 2.
Annex C (informative) contains proposals for dimensions for headrests.
Annex D (informative) contains the measurement uncertainty.
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.
ISO 24496:2017, Office furniture — Office chairs — Methods for the determination of dimensions
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
office work chair
chair for one person, which has an adjustable seat height, can rotate horizontally and is commonly used
in conjunction with a work surface
Note 1 to entry: An office work chair may or may not have features such as armrests and/or a headrest,
3.2
type Ax work chair
office work chair with the largest range of adjustments
3.3
type A work chair
office work chair with a large range of adjustments
3.4
type B work chair
office work chair with a range of adjustments
3.5
type C work chair
office work chair with limited adjustments
3.6
adjustability
intentional change in the position of a component
Note 1 to entry: It can be continuous, within a range or in steps and may be lockable.
3.7
tall office work chair
office work chair with a higher seat height, measured from the floor, than the maximum seat height
specified in Table 2, also with a foot support
Note 1 to entry: A chair used for high work surfaces and desks.
3.8
foot support
component intended to support the feet of the user and assist the user getting on or off a tall office work
chair
Note 1 to entry: A foot support might or might not to be permanently attached to the structure of a high office
work chair.
3.9
median plane
vertical plane running from front to rear through the centre of the seat, dividing the chair into two equal
parts
Note 1 to entry: See Figure 1.

Key
1 Median plane
Figure 1 — Illustration of the median plane
4 Definitions of measurements
The definitions of dimensions are specified in ISO 24496:2017.
5 Measurement conditions
5.1 General
The measurement conditions shall be as specified in ISO 24496:2017, Clause 4 with the derogation in 5.2
of the present document.
5.2 Decision rule for measurement uncertainty
The decision rule to judge if a result is compliant is when the measured value is within the requirement
(i.e. less than or equal to an upper limit, greater than or equal to a lower limit), without taking into
consideration the measurement uncertainty.
Table D.1 in Annex D (informative) contains values for the maximum measurement uncertainties.
6 Test equipment including CMD
The test equipment shall be as specified in ISO 24496:2017, Clause 5.
7 Measurement methods and procedures
The chair shall be set up as specified in ISO 24496:2017, 6.2.1.
The CMD shall be placed in the chair as specified in ISO 24496:2017, 6.2.2 and 6.2.3.
The chair dimensions shall be determined in the sequence specified in Table 1.
Table 1 — Sequence of determining measurements and measurement procedure
Sequence Dimension Dimension ISO 24496:2017 Chair configuration
description reference
a
1 f Maximum vertical 6.3.1.1, C Seat in maximum
max
height of the lumbar height, backrest and
support lumbar adjustments
such as the lumbar
See footnote “a”
support is at the
greatest height that
can be attained. All
other adjustments in
mid-position
a
2 f Minimum vertical 6.3.1.1, D Seat in maximum
min
height of the lumbar a height, backrest and
6.3.1.1, E
support lumbar adjustments
such that the lumbar
See footnote “a”
support is at the least
height that can be
attained. All other
adjustments in mid-
position
Sequence Dimension Dimension ISO 24496:2017 Chair configuration
description reference
3 f Lumbar support 6.3.1.1 Paragraph as above
range
height adjustment immediately below
range f - f , Table 2
max min
a
For chairs with 6.3.1.1 E
mechanical moving
backrests and/or
lumbar devices, also
measure “Vertical
lumbar adjustment
mechanism travel”.
Then report the
higher of the two
values.
4 γ Angle between seat 6.3.1.2, Seat in maximum
and back height, all other
Go through the full
adjustments in mid-
See also footnote “a” sequence in Table 3
position
in Table 3
Check that γ ≥ 90°
5 l Backrest inclination 6.3.1.2 -Table 3 Seat in maximum
range height, all other
Start with sequence 1
adjustments in mid-
in Table 3
position
Pull back the backrest
until it comes to a stop
then record the angle
of the backrest
segment from vertical
6 e (min.) Seat pad angle 6.3.1.2 – Table 3 Seat in maximum
adjustable / height and, if
Go through the full
inclinable, in its rear
Seat pad angle fixed: sequence in Table 3
inclined position, with
then take the
minimum
the back in the most
minimum.
rearward position; all
other adjustments in
mid-position
7 e (max.) Seat pad angle 6.3.1.2 – Table 3 Seat in maximum
adjustable / height and, if
Go through the full
inclinable, in its
Seat pad angle fixed: sequence in Table 3
forward inclined
then take the
maximum
position, with the back
maximum.
in the most upright
position; all other
adjustments in mid-
position
Sequence Dimension Dimension ISO 24496:2017 Chair configuration
description reference
8 a (min.) Seat height, 6.3.2.1 If independently
minimum. adjustable: lumbar
6.3.2.2
protrusion at
For chairs with seat
minimum; lumbar
pad angles zero or
height at midpoint;
greater (+)
seat most horizontal;
backrest most vertical;
all other components
including seat and
backrest at minimum
position
9 a (min) Sitting height, 6.3.2.1 as above
minimum.
6.3.2.2
Sitting heights are
Measure sitting height
only applicable for
chairs with seat pad
angles less than 0
(rearwards slope)
10 b (min.) Adjustable depth of 6.3.2.3 as above
the seat /
Fixed depth of the
seat
11 h (min.) Backrest height 6.3.2.4 as above
12 q (max.) Maximum distance 6.3.2.5 everything adjusted to
from the backrest to their minimum
In derogation to
the front of the position
ISO 24496:2017, the
armrests
dimension shall be
214 mm instead of
180mm
13 p (min.) Height of armrests 6.3.2.7 as above
adjustable /
Height of armrests
not adjustable
14 a (max.) Seat height maximum 6.3.3.1 Re-adjust the chair
according to 6.3.3. If
For chairs with seat 6.3.3.2
independently
pad angles zero or
adjustable: lumbar
greater (+)
protrusion to
minimum; lumbar
height at midpoint;
seat most horizontal;
backrest most vertical;
all other components
including seat and
backrest at maximum
position
Sequence Dimension Dimension ISO 24496:2017 Chair configuration
description reference
15 a (max) Sitting height max 6.3.3.1 as above
Sitting heights are 6.3.3.2
only applicable for
Measure sitting height
chairs with seat pad
angles less than 0
(rearwards slope)
16 b (max.) Adjustable depth of 6.3.3.3 as above
the seat /
Fixed depth of the
seat
17 h (max.) Backrest height 6.3.3.4 as above
18 p (max.) Height of armrests 6.3.3.6 as above
adjustable /
Height of armrests
not adjustable
19 d Seat pad width Remove the CMD and as above
carry out according to
6.3.4.2
20 c Seat pad depth 6.3.4.3 as above
21 j Backrest width 6.3.4.4 as above
In derogation to
ISO 24496:2017,
measure the backrest
width at the mid-
position of the lumbar
zone as defined in
3.18
22 k Radius of backrest 6.3.4.5 as above
23 n Armrest length 6.3.4.6 as above, armrest pad
in the most horizontal
position
24 o Armrest width 6.3.4.7 as above
25 r Minimum clearance 6.3.4.8 as above, armrests in
between armrest their widest possible
assembly when position
armrests are in their
widest position
Sequence Dimension Dimension ISO 24496:2017 Chair configuration
description reference
26 Z Adjustable clear 6.3.4.9 st
max
as above, 1 with
distance between
Z In derogation to armrest pads at their
min
armrest pads / Fixed
ISO 24496:2017, widest possible
clear distance
adjust the armrest position apart
between armrest
pads as wide as
nd
2 with armrest pads
pads
possible whilst
at their narrowest
See footnote “b” ensuring the usable
possible position apart
armrest area
templates are parallel
to the median plane.
Measure the minimum
gap between the edges
of the armrest pads
(5mm below the top)
within the armrest
measurement zone as
defined in
ISO 24496:2017, 3.5
Adjust the armrest
pads as narrow as
possible whilst
ensuring the usable
armrest area
templates are parallel
to the median plane.
Measure the minimum
gap between the edges
of the armrest pads
(5mm below the top)
within the armrest
measurement zone as
defined in
ISO 24496:2017, 3.5.
See also Figure 2 in
this document
27 s Offset of the 6.3.4.10 as above
underframe
a
Most prominent segment: More than one segment may have the same or almost the same protrusion. If the
difference is ≤ 1mm (from the most protruded segment), the segments shall be considered to have the same
protrusion
b
Usable armrest area templates are rectangles 150mm long and 50mm wide for Type Ax and Type A chairs and
150mm long and 40mm wide for Type B and Type C chairs.
Key
1 Line at the front of the seat
2 Armrest measurement zone
3 Usable armrest area template
4 Armrest pad
5 Rear line of the seat surface width zone
Figure 2 — Minimum and maximum gap between armrest pads
8 Dimensional requirements
The dimensions of Types Ax, A, B and C office work chairs shall be as specified in Tables 2 and 3.
Some functions shall be lockable in order that the chair can fulfil its functions.
It shall be possible to adjust the chair while sitting on it.
For adjustable functions, the minimum and maximum values shall be obtained, with the exception of
dimension f, “adjustable height of lumbar support”.
When a range is specified, the chair shall fulfil this requirement too.
Column “Allow (-)”: If there is a “yes”, dimensions less than the minimum requirement are accepted. If
there is a “no”, the dimension shall not be less than the minimum required dimension.
Column “Allow (+)”: If there is a “yes”, dimensions more than the maximum dimension requirement are
accepted. If there is a “no”, the dimension shall not be more than the maximum required dimension.
In addition to conventional backrests, those with a mesh support can be measured using this standard.
However, if they do not have a mechanically moving lumbar device, they are classified as having a fixed
height lumbar support.
NOTE Some flexible backrests can deform in such a way that they can automatically provide lumbar support
at heights suitable for users from small to large without the need of having mechanically moving lumbar devices
behind the backrest. Hence they can be considered to have lumbar height adjustment. There are a number of
different test methods outside of this standard, in a number of countries, which have been developed to verify
adjustability of non-mechanical lumbar adjustments.
Table 2 — Dimensional requirements
Dimensions in millimetres
Type Ax Type A Type B Type C
Seat height
a
a
and sitting yes 400 540 yes 160 yes 400 520 yes 130 yes 420 510 yes 100 yes 430 480 yes 80
b
x
height
Adjustable
depth of yes 380 430 yes 70 yes 425 450 yes 70 yes 425 445 yes 50 yes 425 - yes -
the seat
b
Fixed depth
no no no 425 485 no fixed no 425 - yes fixed
of the seat
Adjustable
Minimum Minimum Minimum
height of
yes 170 300 yes 70 within yes 170 300 yes 70 within yes 170 300 yes 50 within yes 170 300 yes -
lumbar
the range the range the range
support
f
Fixed
height of
no no no 170 300 no - no 170 300 no -
lumbar
support
Maximum
distance
from the
c
q backrest to yes - 200 no - yes - 300 no - yes - 350 no - yes - 400 no -
the front of
the
armrests
Allow (-)
min
max
Allow (+)
Minimum
range
Allow (-)
min
max
Allow (+)
Minimum
range
Allow (-)
min
max
Allow (+)
Minimum
range
Allow  (-)
min
max
Allow (+)
Minimum
range
Type Ax Type A Type B Type C
Hip
breadth
clearance
when
d
r no 480 - yes - no 480 - yes - no 460 - yes - no 460 - yes -
armrests
are in
widest
position
Adjustable
clear
distance
yes 410 510 yes - yes 410 510 yes - yes 460 510 yes - yes 460 510 yes -
between
armrest
pads
de
z
Fixed clear
distance
between no no no 460 510 no - no 460 - yes -
armrest
pads
Height of
armrests yes 200 290 yes 100 yes 200 290 yes 100 yes 225 250 yes 50 yes 200 250 yes -
adjustable
p
Height of
armrests
no no no 225 275 no - no 200 250 no -
not
adjustable
Seat pad
d no 400 - yes - no 400 - yes - no 400 - yes - no 400 - yes -
width
Seat pad
c no 380 - yes - no 380 - yes - no 380 - yes - no 380 - yes -
depth
Allow (-)
min
max
Allow (+)
Minimum
range
...