EN 1335-1:2020+A1:2022

SLOVENSKI STANDARD
01-februar-2023
Nadomešča:
SIST EN 1335-1:2020
Pisarniško pohištvo - Pisarniški delovni stoli - 1. del: Mere - Ugotavljanje mer
(vključuje dopolnilo A1)
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+A1:2022
ICS:
97.140 Pohištvo Furniture
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1335-1:2020+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
November 2022
EUROPÄISCHE NORM
ICS 97.140 Supersedes EN 1335-1:2020
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 and includes Amendment 1 approved by CEN on 9 October
2022.
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, Türkiye 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
© 2022 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1335-1:2020+A1:2022 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. 13
9 Information for use . 19
10 Test report . 19
Annex A (informative) Rationale for determination of office chair dimensions: comparison
of current published dimensions with European anthropometric data . 20
Annex B (informative) Example of how to read Table 2 . 29
Annex C (informative) Dimensions of neck rests and headrests . 30
Annex D (informative) Measurement uncertainty . 31
Bibliography . 32

European foreword
This document (EN 1335-1:2020+A1:2022) 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 May 2023, and conflicting national standards shall be
withdrawn at the latest by May 2023.
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 includes Amendment 1 approved by CEN on 9 October 2022.
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!This document supersedes EN 1335-1:2020"
Any feedback and questions on this document should be directed to the users’ national standards body.
A complete listing of these bodies can be found on the CEN website.
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, Türkiye 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 24496:2021, 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
!Note 1 to entry: Type Ax chair has the largest range of adjustment for the seat height, a smaller seat depth
dimension and a smaller distance from the backrest to the front of the armrests."
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 tall 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:!2021".
5 Measurement conditions
5.1 General
The measurement conditions shall be as specified in ISO 24496:!2021", 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:!2021", Clause 5.
7 Measurement methods and procedures
The chair shall be set up as specified in ISO 24496:!2021", 6.2.1.
The CMD shall be placed in the chair as specified in ISO 24496:!2021", 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:!2021" Ch
...