FprEN 13659 rev

SLOVENSKI STANDARD
01-julij-2011
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Shutters and external venetian blinds - Performance requirements including safety
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Fermetures pour baies équipées de fenêtres et stores vénitiens extérieurs - Exigences
de performance y compris la sécurité
Ta slovenski standard je istoveten z: prEN 13659 rev
ICS:
91.060.50 Vrata in okna Doors and windows
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EUROPEAN STANDARD
DRAFT
prEN 13659 rev
NORME EUROPÉENNE
EUROPÄISCHE NORM
May 2011
ICS 91.060.50 Will supersede EN 13659:2004+A1:2008
English Version
Shutters and external venetian blinds - Performance
requirements including safety
Fermetures pour baies équipées de fenêtres et stores Abschlüsse Außen und Außenjalousien - Leistungs- und
vénitiens extérieurs - Exigences de performance y compris Sicherheitsanforderungen
la sécurité
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee CEN/TC 33.

If this draft becomes a European Standard, 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.

This draft European Standard was established by CEN in three official versions (English, French, German). A version in any other language
made by translation under the responsibility of a CEN member into its own language and notified to the CEN-CENELEC Management
Centre has the same status as the official versions.

CEN members are the national standards bodies of Austria, Belgium, Bulgaria, Croatia, Cyprus, Czech Republic, Denmark, Estonia,
Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland,
Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

Recipients of this draft are invited to submit, with their comments, notification of any relevant patent rights of which they are aware and to
provide supporting documentation.

Warning : This document is not a European Standard. It is distributed for review and comments. It is subject to change without notice and
shall not be referred to as a European Standard.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION

EUROPÄISCHES KOMITEE FÜR NORMUNG

Management Centre: Avenue Marnix 17, B-1000 Brussels
© 2011 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 13659 rev:2011: E
worldwide for CEN national Members.

prEN 13659:2011 (E)
Contents Page
Foreword . 5
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Wind resistance . 10
4.1 In the extended position . 10
4.2 In the retracted position . 12
5 Resistance to snow load (roller shutters only). 12
5.1 General . 12
5.2 Determination . 13
5.3 Performance requirement . 13
5.4 Expression of the results . 13
5.5 Classes of snow resistance . 14
6 Operating effort . 14
6.1 General . 14
6.2 Determination . 14
6.3 Performance requirement and operational effort classes . 14
7 Design of the operating mechanism — HPV diagrams ("Human Pull Value") . 14
7.1 General . 14
7.2 Performances requirements . 15
7.3 Diagrams HPV . 15
8 Misuse . 16
8.1 General . 16
8.2 Determination . 18
8.3 Performance requirement . 18
9 Edge loading (wing shutters only) . 19
9.1 General . 19
9.2 Determination . 19
9.3 Performance requirement . 19
10 Resistance of mechanisms holding the shutter in the extended position . 19
10.1 General . 19
10.2 Determination . 19
10.3 Performance requirement . 20
11 Mechanical endurance (repeated operating cycles) . 20
11.1 General . 20
11.2 Determination . 21
11.3 Performance requirement . 21
11.4 Classes of endurance . 22
12 Operation in frosty conditions . 23
13 Impact resistance . 23
13.1 General . 23
13.2 Determination . 23
13.3 Performance requirement . 23
prEN 13659:2011 (E)
14 Resistance against intrusion . 23
14.1 General . 23
14.2 Retracton of the curtain . 24
14.3 Resistance of the guide rail against splaying . 24
14.4 Rigidity of the curtain under the application of an horizontal force . 25
14.5 Perforation of a lath or of a panel . 26
14.6 Resistance of the bottom lath . 26
14.7 Installation of the shutter . 26
14.8 Ability to dismantle from outside . 27
14.9 Access to the installation means from outside . 27
14.10 Access to operating system from outside (including remote control) . 27
14.11 Classification of products . 27
15 Safety in use . 28
15.1 General . 28
15.2 Protection from potentially harmful parts. 28
15.3 Power operated shutters – Injurious contact in operation . 28
15.4 Electrical hazards . 29
16 Hygiene, health and environment . 29
16.1 General . 29
16.2 Determination . 30
16.3 Performance requirement . 30
17 Additional thermal resistance . 30
17.1 General . 30
17.2 Determination . 30
 Performance requirement . 30
17.3 30
18 Total solar energy transmittance g . 30
tot
18.1 General . 30
18.2 Determination . 30
18.3 Performance requirement . 30
19 Durability . 31
19.1 General . 31
19.2 Rigid plastic materials . 31
19.3 Metals. 32
19.4 Wood . 33
20 Dimensional tolerances . 34
20.1 General . 34
20.2 Determination . 34
20.3 Performance requirement . 34
21 Handling and storage . 34
21.1 General . 34
21.2 Determination . 34
21.3 Performance requirement . 34
22 Information for use . 35
22.1 General . 35
22.2 General . 35
22.3 Accompanying documents (in particular the instruction handbook) . 35
22.4 Marking . 37
23 Evaluation of conformity . 37
23.1 General . 37
23.2 Initial Type Testing – Type Testing . 38
23.3 Factory Production Control (FPC) . 39
Annex A (informative) Temperature effects . 42
A.1 General . 42
prEN 13659:2011 (E)
A.2 Determination . 42
A.3 Performance requirement . 43
Annex B (informative) Calculation of wind pressure exerted on a shutter — Allocation of a class
of wind resistance . 44
B.1 General . 44
B.2 Application to shutters . 44
B.3 Allocation of a class of wind resistance to a shutter . 46
Annex C (normative) List of significant machine hazards . 47
Annex D (informative) Example of methodology for wind stress determination on fixed parts of
shutters . 48
Annex ZA (informative) Clauses of this European Standard addressing the provisions of the EU
Construction Products Directive . 49
Annex ZB (informative) Relationship between this European Standard and the Essential
Requirements of EU Directive 2006/42/EC . 53
Bibliography . 54

prEN 13659:2011 (E)
Foreword
This document (prEN 13659:2011) has been prepared by Technical Committee CEN/TC 33 “Doors, windows,
shutters, building hardware and curtain walling”, the secretariat of which is held by AFNOR.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 13659:2004 + A1:2008:.
This document has been prepared under a mandate given to CEN by the European Commission and the
European Free Trade Association, and supports essential requirements of EU Directive(s).
For relationship with EU Directives, see informative Annex ZA and Annex ZB, which is an integral part of this
document.
This standard specifies the requirements for shutters and external venetian blinds, the levels of performance
and the associated classes where applicable.
It is completed by test standards as well as by the standards referring to specific performance requirements.
.Annexes A, B and D are informative.
Annex C is normative.
This document includes a Bibliography.
- Clause 4 “wind resistance” has been modified in integrate requirements on the shutters and external
venetian blinds in the retracted position and has been aligned to the EN 1932 “test methods” under
revision. Class 0 has been deleted.
- Clause 10 “Resistance of mechanisms holding the shutter in the extended position” has been clarified and
modified to be applicable to any type of shutters and external venetian blinds.
- Clause 14 “Resistance against intrusion” has been added.
- Clause 17 “Additional thermal resistance” has been clarified
- Clause 18 “Total solar energy transmittance” has been added
- Clause 19.2 “Durability of rigid plastic materials” has been aligned to the new version of EN 13245-1.
- Clause 19.3 “Durability of metals” has been clarified
- Clause 20 “Dimensional tolerances” has been modified for external venetian blinds
- Clause 23 “Evaluation of conformity” has been aligned to the European template
- Annex B “Calculation of wind pressure exerted on a shutter” has been modified to consider values of
Eurocode 1.
- Annex C “List of significant machine hazards” has been modified. Standard EN ISO 14121-1 has been
introduced.
prEN 13659:2011 (E)
- Annex D “Example of methodology for wind stress determination on fixed parts of shutters” has been
added.
- Annex ZA has been modified to introduce a two mandated characteristics : the total solar energy
transmittance g and the additional thermal resistance ∆R
tot
prEN 13659:2011 (E)
Introduction
The performances given in this European Standard which illustrate suitability for use, are required for every
type of shutter and external venetian blind (intrinsic performances).
Other performances are only required as a complement (specific performances) and result in specific
products. Some of them are described in European Standards (e.g. EN 1522, EN 1523, ENV 1627,
ENV 1628, ENV 1629, ENV 1630, EN 13123-1, EN 13124-1, EN 13123-2 and EN 13124-2). Others are
described in EN 14500 and EN 14501 which are related to important issues such as thermal comfort, i.e.:
 Solar factor;
 Shading factor;
 Direct solar transmittance;
 Secondary heat transfer factor;
and visual comfort, i.e.:
 Light control;
 Night privacy;
 Visual contact with the outside;
 Glare control;
 Use of daylight;
 Rendering of colours.
or with the airborne sound insulation (see EN 14759).
NOTE Health and Safety regulations require that the workplace receives as much natural light as is reasonably
practical (see EU Directive 89/654/EEC) and protection of operators working with VDV screens against glare control and
reflected light (see EU Directive 87/391/EEC).
The list of these documents is given in the Bibliography.
With the aim of clarifying the intentions of the standard and avoiding doubts when reading it, following
assumptions were made related to power operated products while producing it:
- Negotiations shall occur between the manufacturer and the purchaser concerning particular conditions for
use and places for use such as for nursery schools or for buildings for disabled people which need
specific risk analysis;
- The risk analysis carried out in this standard and the corresponding significant hazards listed in Annex C
suppose a normal use or normally predictable use e.g. which excludes deliberate and conscious risks
taken by the user (see Interpretative Document “Safety in use” of EU Construction Products Directive).
prEN 13659:2011 (E)
1 Scope
This European Standard specifies the performance requirements which shutters and external venetian blinds
shall fulfil when fitted to a building. It deals also with the significant hazards for construction, transport,
installation, operation and maintenance (see list of significant machine hazards in Annex C).
It applies to all shutters and external venetian blinds as well as similar products whatever their use and nature
of the materials used, as follows and defined in EN 12216:
— external venetian blind, roller shutter, wing shutter, Venetian shutter, flat-closing concertina shutter,
concertina shutter or sliding panel shutter, with or without a system of projection.
These products can be operated manually with or without compensating spring, or by means of electric
motors (power operated products).
NOTE This standard covers shutters and external venetian blinds mounted externally. In case such products are
installed internally, they should fulfil all relevant safety requirements defined in EN 13120.
This document is not applicable to shutters and external venetian blinds which are manufactured before the
date of application of this document by CEN.
The noise emission of power operated shutters and external venetian blinds is not considered to be a relevant
hazard. Therefore this standard does not contain any specific requirements on noise in relation to the
Machinery Directive.
If not specified otherwise, the term "shutter" used in this document refers to any type of shutter or external
venetian blind included in the scope of this European Standard.
2 Normative references
The following referenced documents are indispensable for the application 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.
EN ISO 12100-2:2003, Safety of machinery — Basic concepts, general principles for design — Part 2:
Technical principles (ISO 12100-2:2003).
EN ISO 14121-1, Safety of machinery - Risk assessment - Part 1: Principles
EN 1070:1998, Safety of machinery - Terminology.
EN 1670, Building hardware - Corrosion resistance - Requirement and test methods.
prEN 1932:2011, External blinds and shutters - Resistance to wind loads - Method of testing.
EN 12045, Shutters and blinds power operated - Safety in use - Measurement of the transmitted force.
EN 12194, Shutters, external and internal blinds - Misuse - Test methods.
EN 12216, Shutters, external blinds, internal blinds — Terminology, glossary and definitions.
EN 12833, Skylight and conservatory roller shutters - Resistance to snow load - Test method.
EN 12835, Airtight shutters - Air permeability test.
EN 13125, Shutters and blinds - Additional thermal resistance - Allocation of a class of air permeability to a
product.
prEN 13659:2011 (E)
EN 13245-1:2004, Plastics - Unplasticized poly(vinyl chloride) (PVC-U) profiles for building applications – Part
1: Designation of light coloured profiles.
prEN 13330:2011, Shutters - Hard body impact — Test method.
EN 13527, Shutters and blinds – Measurement of operating force — Test methods.
EN 14201, Blinds and shutters - Resistance to repeated operations (mechanical endurance) - Methods of
testing.
EN 60335-1, Household and similar electrical appliances - Safety - Part 1: General requirements (IEC 60335-
1:2001, modified)
EN 60335-2-97, Safety of household and similar electrical appliances - Part 2-97: Particular requirements for
drives for rolling shutters, awnings, blinds and similar equipment (IEC 60335-2-97:1998, modified).
EN 61310-1, Safety of machinery – Indication, marking and actuation – Part 1: Requirements for visual,
auditory and tactile signals (IEC 61310-1:1995).
EN ISO 10077-1, Thermal performance of windows, doors and shutters -Calculation of thermal transmittance -
Part 1: Simplified method (ISO 10077-1:2000).
ISO 9227, Corrosion tests in artificial atmospheres – Salt spray tests.
3 Terms and definitions
For the purposes of this European Standard, the terms and definitions given in EN 1070:1998 and
EN 12216:2002 and the following apply.
3.1
intrinsic performance
overall performances of the shutter regardless of its application as opposed to specific performance
3.2
specific performance
performance which may be additional and complementary to the intrinsic performances and refers to a
specific product (for example, acoustic, thermal, burglary resistance, etc.)
3.3
curtain
that part of the product which is set in motion by the operating mechanism, and ensures its function
3.4
extension/retraction
movement of the curtain resulting in an increase/decrease the surface area covered
3.5
opening/closing
terms used to describe the increase in light (opening) or reduction of light (closing) in an extended position for
products with slats or slats which can be tilted or adjusted
NOTE The common parlance uses "open" for retraction and "closed" for extension.
3.6
rough operation
sharp action on the operating mechanism or directly on the curtain, resulting in excessive speed at the
beginning and a sudden stop at the end
prEN 13659:2011 (E)
NOTE Rough operation is only possible if the moving part has significant inertia (mass and speed).
3.7
forced operation
excessive force exerted on the operating mechanism or directly on the curtain with the aim of causing
movement in spite of resistance to the travel of the curtain
3.8
reversed operation
extension or retraction of the curtain occurring in the opposite direction to that intended without use of
abnormal force
3.9
winch handle
operating mechanism consisting of a reel rotated by an operation handle which allows accumulation of a cord,
cable, or chain
3.10
gear with crank handle
operating mechanism consisting of a gear attached to an axle, a drive shaft, a universal joint, a rotated rod
and a crank handle
3.11
one direction movement of the operating mechanism
operating mechanism operated by a single cord, belt, etc., extension / retraction being effected by relying on
gravity or the potential energy stored up during retraction / extension, respectively
3.12
endless movement of the operating mechanism
operating mechanism operated by a loop, movement in one direction extends the curtain (or tilts the laths),
and in the reverse retracts the curtain (or tilts the laths) in the opposite direction
3.13
monocommand
same mechanism which achieves both opening/closing and extension/retraction
3.14
vertical loading/racking
downward force applied to the panel edge of a wing shutter
3.15
determination of performance
means of verification of the performance relating to the corresponding requirement
4 Wind resistance
4.1 In the extended position
4.1.1 General
The wind resistance of a shutter is characterised by its ability to withstand specified loads simulating the
action of wind in positive or negative pressure.
Wind resistance is specified through classes defined by threshold values of nominal pressure p and safety
N
pressure p = γ x p with γ = 1,5:
S N
prEN 13659:2011 (E)
 Nominal wind pressure p : it represents the wind pressure under which the shutter shall not sustain
N
deformation or deterioration detrimental to its correct operation.
 Safety wind pressure p : it represents the wind pressure under which no deterioration which may be
S
dangerous for the persons shall be observed (breakage, coming out from the fixing or locking devices).
4.1.2 Determination
The determination shall be in accordance with the test methods specified in FprEN 1932:2011.
NOTE The FprEN 1932:2011 specifies that the test samples shall be of the following dimensions: the maximum width
associated with the greatest height achievable with this width and the maximum height associated with the greatest width
achievable with this height. Therefore, two tests are necessary for a same range of shutters.
4.1.3 Performance requirement
4.1.3.1 General
Depending on the type of shutter considered, the performance criteria applicable to the curtain and specified
in:
 clause 8.1.5 of prEN 1932:2011 for roller shutter, wing shutter, venetian shutter, flat closing
concertina shutter, concertina shutter, sliding panel shutter,
or
 clause 8.2.8 prEN 1932:2011 for external venetian blind
shall be fulfilled.
In addition, for projecting shutters, the performance criteria of the projection mechanism specified in clause
8.3.6 of prEN 1932:2011 shall be fulfilled.
The classification of the shutters shall be given according to 4.1.3.2.
4.1.3.2 Classes of wind resistance
The classes of wind resistance are given by the threshold test pressures specified in Table 1. For projecting
shutters, the class declared shall be the class obtained when the shutter is in the non-projected position.
Table 1 — Classes of resistance to static pressure
Classes
1 2 3 4 5 6
Nominal pressure p (N/m²) 50 70 100 170 270 400
N
Safety pressure p = 1,5 p (N/m²) 75 100 150 250 400 600
S N
NOTE 1 The application of a static pressure over the shutter gives the classification shown in Table 1. It provides an
accurate measurement of the intrinsic resistance of a shutter but does not consider the dynamic behaviour of such a
shutter in real wind conditions. Annex B gives the rule allowing the calculation of the wind speed from the static pressure
for which the shutter has been classified. This calculation rule considers the coefficient C of the shutter, i.e. the algebraic
p
difference between the external pressure coefficient C and the internal pressure coefficient C . The coefficient C is
pe pi p
mainly depending on the air permeability of the shutter.
prEN 13659:2011 (E)
NOTE 2 The FprEN 1932:2011 states that “the tests shall be carried out with the maximum dimensions defined by the
manufacturer in the most unfavourable configuration for each product type. The test results obtained can then be applied
to all more favourable configurations and to all smaller dimensions in the particular product design”. For External Venetian
Blinds, the dimensions of the test specimens have been fixed (see 8.2.3 of prEN 1932:2011 and Annex B).
4.2 In the retracted position
4.2.1 General
Since some parts of shutters – for example head boxes, guiderails – cannot be retracted, they have to
withstand in some cases very high wind speed. The resulting pressure on the product depends on:
 The installation condition,
 The height of the building,
 The location of the building.
This clause applies to the shutter itself. It does not cover the fixing of the shutter to its support for which the
manufacturer shall give guidance in the instructions for installation (see 22.3.2.1).
NOTE As the criteria determining the resulting pressure applied to the fixed parts of shutters are depending on
installation conditions (location, height, …), it is recommended to refer to National rules – if available – which give such
information on the basis of National wind speed map.
4.2.2 Determination
The determination shall be done by calculation when designing the shutter.
NOTE Since the shutters covered by this standard have a huge variety it is not possible to describe a test method for
each product.
4.2.3 Performance requirement
All fixed parts of the shutters, i.e. the parts that are not retracted when the shutter is in the complete retracted
position, shall be designed to withstand a minimum pressure of 800 Pa.
NOTE An example of determination of wind stress applied is given in Annex D.
5 Resistance to snow load (roller shutters only)
5.1 General
This clause is only applicable to roller shutters for skylight and conservatory for which the inclination angle
from the horizontal is less than 60°.
Under the weight of snow, the shutter fitted to the window shall not:
a) sustain deformation or deterioration which is detrimental to its correct operation;
b) exit from its guide rails.
Two ways of resistance are considered:
1) the shutter itself resists the snow pressure;
prEN 13659:2011 (E)
2) the shutter resists the snow pressure together with the mechanical association of the glazing, fitted at
a distance defined by the manufacturer.
This second way of resistance is allowed only if the following requirements are fulfilled:
 the shutter accepts a level of deformation resulting in contact with the glazing under the snow loading;
and
 the distance between the shutter and the glazing is not modified by the opening of the window.
NOTE An attempt to open the window, when the shutter is loaded with snow, should not endanger the user.
5.2 Determination
The determination shall be in accordance with the test method specified in EN 12833.
5.3 Performance requirement
The shutter resists to the snow pressure p , maximum snow pressure specified by the manufacturer, if the
N
following requirements are fulfilled:
 after having applied the nominal pressure p , the operating effort shall be maintained within the limit of
N
the initial class;
 under the safety pressure p = γ x p with γ =1,5, the shutter shall not break or exit from the guide rails.
S N
5.4 Expression of the results
The results shall be expressed as follows:
1) if the shutter resists itself the snow pressure:
 the manufacturer shall declare:
 the maximum nominal snow pressure p expressed in N/m²;
N
 the following form of resistance : shutter alone;
 shutters of the same range which are narrower and for which the curtain surface is lower than
the product tested shall be deemed to resist at least the same snow pressure p than the
N
product tested.
2) if the shutter resists the snow pressure with the mechanical association of the glazing:
 the manufacturer shall declare:
 the maximum nominal snow pressure p expressed in N/m²;
N
 the following form of resistance: shutter in association with a glazing which withstands
pressure p and located at the maximum distance d from the shutter;
N
 shutters of the same range with a width and a height higher than those of the product tested
shall be deemed to resist at least the same snow pressure p at the condition that the distance
N
from the glazing remains the same.
prEN 13659:2011 (E)
5.5 Classes of snow resistance
No classes are defined for snow resistance.
For each dimension, the manufacturer shall specify the maximum snow pressure the shutter can sustain, by
itself or in mechanical association with a closed window.
6 Operating effort
6.1 General
This clause does not apply to power operated products.
The effort F needed to extend /retract the curtain, to tilt the laths and eventually to project the curtain depends
c
on the type of operation.
6.2 Determination
The determination shall be in accordance with the test methods specified in EN 13527.
6.3 Performance requirement and operational effort classes
The operating effort F shall not exceed the values specified in Table 2.
C
Table 2 — Maximum values of the operating effort F
C
F
C
(N)
TYPES OF OPERATION
Class 1 Class 2
a,c
Crank or winch handle , lever 30 15
a,b,c
Belt, cord or chain, 90 50
Rod operation vertical plane 90 50
or hand horizontal or sloping plane 50 30
Spring compensated roller shutters can reach 1,5 F for locking in the fully extended position.
C
A shutter belongs to class 2 if all the operations of moving the curtain, tilting the laths and projecting the curtain are class 2.
Otherwise the shutter is class 1.
a
The operating mechanism shall also fulfil the requirement in clause 7.
b
One direction movement or endless movement of the operating mechanism.
c
Monocommand.
7 Design of the operating mechanism — HPV diagrams ("Human Pull Value")
7.1 General
This clause specifies geometrical characteristics of the operating mechanisms taking into account the comfort
of the operation.
prEN 13659:2011 (E)
7.2 Performances requirements
Gear operation
Gear with crank or winch handle shall have:
 a handle of a length R less than or equal to 0,20 m (R ≤ 0,20 m);
 a reduction ratio r of the gear less than 1:10 (average or mean reduction ratio when, for the same gear,
several reductions exist).
NOTE A reduction ratio of 1:10 means it is necessary to make ten turns of the cranks to achieve one rotation of the
roller tube or axle.
Belt, cord or chain operation
These operating mechanisms shall have the minimal dimensions specified in the HPV diagrams (see Figure 1
and Figure 2).
7.3 Diagrams HPV
Apparent cord diameter for HPV for n cords with diameter d.

d is the diameter of a single cord

Key
1 Acceptable
2 Non acceptable
F Operating effort
c
Figure 1 — HPV diagram for cord or chain operation

prEN 13659:2011 (E)
Key
1 Acceptable
2 Non acceptable
F Operating effort
c
Figure 2 — HPV diagram for belt operation
8 Misuse
8.1 General
8.1.1 General requirement
Under the action of abnormal but foreseeable use (misuse), the shutter shall not become misshapen or
damaged to the extent that:
a) the damage impairs its correct operation;
b) the damage which leads to a deterioration in appearance:
Misuse operations are related to the displacement of the curtain, the tilting of the laths and, for projected
products, to the projection of the curtain.
8.1.2 Displacement of the curtain
 Rough operation
Rough operation occurs during extension and retraction.
 Forced operation
Forced operation occurs in the direction of extension and retraction, the curtain being either stopped or
blocked in extended or retracted position, or blocked in an intermediate position.
prEN 13659:2011 (E)
Figure 3 illustrates the six possibilities of forced operations.

Key
1 Direction of extension
2 Direction of retraction
3 Obstruction
a) Curtain fully extended
b) Curtain fully retracted
c) Curtain in intermediate position, obstructed during extension and/or retraction
Figure 3 — Illustration of the six possibilities of forced operation
 Reversed operation
Reversed operations are only applicable to roller shutters or to products using a rolling mechanism for
extension or retraction.
For these products, operation in situation a1 or b2 illustrated in Figure 3 is a reversed operation when the
movement in the opposite direction is possible with an effort less than the limit of the class of operation. If the
movement is not possible, it is a forced operation.
Reversed operation occurs on extension with the curtain fully extended and on retraction with the curtain fully
retracted.
8.1.3 Tilting of laths
 Rough operation
Rough operation is not possible; the conditions defining its occurrence are not likely to occur (no excessive
speed, no inertia of laths).
 Forced operation
Forced operation occurs in both closed positions which are the result of tilting the laths in both directions from
the open position.
 Reversed operation
Not applicable.
prEN 13659:2011 (E)
8.1.4 Projection of the curtain
 Rough operation
R
...