EN 1366-1:2014+A1:2020

SLOVENSKI STANDARD
01-oktober-2020
Nadomešča:
SIST EN 1366-1:2014
Preskusi požarne odpornosti servisnih inštalacij - 1. del: Ventilacijski kanali
Fire resistance tests for service installations - Part 1: Ventilation ducts
Feuerwiderstandsprüfungen für Installationen - Teil 1: Lüftungsleitungen
Essais de résistance au feu des installations techniques - Partie 1: Conduits de
ventilation
Ta slovenski standard je istoveten z: EN 1366-1:2014+A1:2020
ICS:
13.220.50 Požarna odpornost Fire-resistance of building
gradbenih materialov in materials and elements
elementov
91.060.40 Dimniki, jaški, kanali Chimneys, shafts, ducts
2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

EN 1366-1:2014+A1
EUROPEAN STANDARD
NORME EUROPÉENNE
August 2020
EUROPÄISCHE NORM
ICS 13.220.50; 91.140.30 Supersedes EN 1366-1:2014
English Version
Fire resistance tests for service installations - Part 1:
Ventilation ducts
Essais de résistance au feu des installations techniques Feuerwiderstandsprüfungen für Installationen - Teil 1:
- Partie 1: Conduits de ventilation Lüftungsleitungen
This European Standard was approved by CEN on 13 June 2014 and includes Amendment approved by CEN on 1 June 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 1366-1:2014+A1:2020 E
worldwide for CEN national Members.

Contents Page
European foreword . 3
Introduction . 5
1 Scope . 6
2 Normative references . 6
3 Terms and definitions . 7
4 Test equipment . 7
5 Test conditions . 9
6 Test specimen . 9
7 Installation of test specimen . 12
8 Conditioning . 14
9 Application of instrumentation . 14
10 Test procedure . 16
11 Performance criteria . 18
12 Test report . 18
13 Field of direct application of test results . 19
Bibliography . 50

European foreword
This document (EN 1366-1:2014+A1:2020) has been prepared by Technical Committee CEN/TC 127
“Fire safety in buildings”, the secretariat of which is held by BSI.
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 February 2021 and conflicting national standards shall
be withdrawn at the latest by February 2021.
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 1 June 2020.
This document supersedes !EN 1366-1:2014".
The start and finish of text introduced or altered by amendment is indicated in the text by tags !".
!This European Standard has been prepared under a mandate given to CEN by the European
Commission and the European Free Trade Association."
EN 1366 “Fire resistance tests for service installations” consists of the following:
— Part 1: Ventilation ducts;
— Part 2: Fire dampers;
— Part 3: Penetration seals;
— Part 4: Linear joint seals;
— Part 5: Service ducts and shafts;
— Part 6: Raised floors;
— !Part 7: Conveyor systems and their closures;"
— Part 8: Smoke extraction ducts;
— Part 9: Single compartment smoke extraction ducts;
— Part 10: Smoke control dampers (in course of preparation);
— Part 11: Protective Systems for Essential Services (in course of preparation);
— Part 12: Non-mechanical fire barrier for ventilation ductwork;
— !Part 13: Chimneys."
!deleted text"
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
The purpose of this test is to measure the ability of a representative ventilation duct assembly / system
that is part of an air distribution system to resist the spread of fire from one fire compartment to
another with fire attack from inside or outside the duct. It is applicable to vertical and horizontal ducts,
with or without branches, taking into account joints and openings, as well as suspension devices and
penetration points.
The test measures the length of time for which ducts, of specified dimensions, suspended as they would
be in practice, satisfy defined criteria when exposed to fire from (separately) both inside and outside
the duct.
The closed end of each horizontal duct at the back of the furnace is fully restraint. Outside the furnace,
ducts exposed to fire from the outside are tested unrestrained, while ducts exposed to fire from the
inside (horizontal only) are tested restrained.
The force measurement at horizontal duct B is not mandatory but can be done on the request of the
sponsor.
The test takes into account the effect of fire exposure from the outside where a pressure differential is
maintained in the duct as well as the effect of fire entering the ducts in conditions where forced air
movement may or may not be present.
Caution
The attention of all persons concerned with managing and carrying out this fire resistance test is drawn
to the fact that fire testing may be hazardous and that there is a possibility that toxic and/or harmful
smoke and gases may be evolved during the test. Mechanical and operational hazards may also arise
during the construction of the test elements or structures, their testing and disposal of test residues.
An assessment of all potential hazards and risks to health should be made and safety precautions
should be identified and provided. Written safety instructions should be issued. Appropriate training
should be given to relevant personnel. Laboratory personnel should ensure that they follow written
safety instructions at all times.
1 Scope
This European Standard specifies a method for determining the fire resistance of vertical and horizontal
ventilation ducts including those access panels, which are integral part of the tested ducts. The test
examines the behaviour of ducts exposed to fire from the outside (duct A) and fire inside the duct (duct
B). This European Standard is used in conjunction with EN 1363-1.
Annex A provides general guidance and gives background information.
This European Standard is not applicable to:
a) ducts whose fire resistance depends on the fire resistance performance of a ceiling or wall (where
ducts are located in cavities enclosed by fire-resistant shafts or ceilings);
b) ducts containing fire dampers at points where they pass through fire separations;
c) one, two or three sided ducts;
d) fixing of suspension devices (e.g. anchors) to floors or walls.
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.
EN 1363-1, Fire resistance tests - Part 1: General Requirements
EN 1364-1:1999, Fire resistance tests for non-loadbearing elements - Part 1: Walls
EN 1366-8, Fire resistance tests for service installations - Part 8: Smoke extraction ducts
EN 1507, Ventilation for buildings - Sheet metal air ducts with rectangular section - Requirements for
strength and leakage
EN 12237, Ventilation for buildings - Ductwork - Strength and leakage of circular sheet metal ducts
EN 15882-1, Extended application of results from fire resistance tests for service installations - Part 1:
Ducts
EN 60584-1, Thermocouples - Part 1: EMF specifications and tolerances (IEC 60584-1)
EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel - Part 1: Bolts,
screws and studs with specified property classes - Coarse thread and fine pitch thread (ISO 898-1)
EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full - Part 1: General principles and requirements (ISO 5167-1)
EN ISO 5167-2, Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full - Part 2: Orifice plates (ISO 5167-2)
EN ISO 5167-3, Measurement of fluid flow by means of pressure differential devices inserted in circular
cross-section conduits running full - Part 3: Nozzles and Venturi nozzles (ISO 5167-3)
EN ISO 13943, Fire safety - Vocabulary (ISO 13943)
3 Terms and definitions
For the purposes of document, the terms and definitions given in EN 1363-1 and EN ISO 13943,
together with the following, apply.
3.1
fire-resistant ventilation duct
duct used for the distribution or extraction of air and designed to provide a degree of fire resistance
3.2
combustible lining
lining / coating on the inner surface of the duct; reaction to fire classification of the lining material
(tested in end use condition, treated as an external, non-substantial component) worse than class A2-
s1,d0 according to EN 13501-1
3.3
self-supporting duct
duct constructed e.g. from fire-protective boards without encasing a steel duct
3.4
suspension devices
components used for suspending and fixing a duct from a floor or supporting a duct from a wall
3.5
supporting construction
wall, partition or floor which the duct passes through in the test
3.6
compensator
device used to prevent damage from the forces generated by expansion
3.7
access panel
cover for an inspection opening within the duct
3.8
fire protected steel duct
steel duct with an external insulation to provide fire resistance
!3.9
kitchen extract duct
ductwork where combustible deposits, such as grease are likely to accumulate on its internal
surfaces"
4 Test equipment
4.1 General
In addition to the test equipment specified in EN 1363-1 the following is required:
4.2 Furnace
This shall be capable of subjecting ventilation ducts to the standard heating and pressure conditions
specified in EN 1363-1 and be suitable for testing ducts in the vertical (see Figure 1) or horizontal (see
Figure 2) orientation.
4.3 Fan for duct A
This shall be able to produce at the start and throughout the test an underpressure of (300 ± 15) Pa
within duct A (see Figure 4) and shall be connected either directly, or by a suitable length of flexible
ducting, to the measuring station described in 4.5.
If the duct is used in practise as a smoke extraction duct, the duct shall be tested in accordance with
EN 1366-8. In this case, fan A shall be adjusted to (500 ± 15) Pa for testing duct a according to this
standard.
4.4 Fan for duct B
This shall be able to produce an air velocity when extracting gas from duct B (see Figure 5), of at least
3m/s measured at ambient temperature in the duct before the test. It shall be connected either directly,
or by a suitable length of flexible ducting, to the air velocity measuring station described in 4.8. The fan
shall be provided with a by-pass vent that can be opened prior to the damper described in 4.7 being
shut.
4.5 Volume flow measuring station
This shall consist of a venturi, orifice plate, or other suitable device and (where necessary) an airflow
straightener, installed in straight lengths of pipe, all sized to EN ISO 5167-1, EN ISO 5167-2 and EN
ISO 5167-3. It shall be connected to the end of the condensing unit to determine the volume flow rate of
gas passing through duct A during the test. The measuring device shall be capable of measuring to an
accuracy of ± 5 %. Regardless of whether vertical or horizontal ducts are being tested, the volume flow
measuring station shall always be used in a horizontal orientation.
4.6 Condensing unit
This shall be installed between the end of duct A and the flow-measuring device and shall allow for
sufficient drainage. The gas temperature adjacent to the flow-measuring device shall be measured by
sheathed thermocouple, type K according to EN 60584-1, max. 2 mm in diameter, with an insulated hot
junction, arranged pointing upwards to allow for draining moisture. Its measuring junction shall be
located at the centre line of the measuring tube and at a distance equal to twice the diameter of the
measuring tube downstream from the flow-measuring device. The temperature measured by this
thermocouple shall not exceed 40 °C.
4.7 Damper
This shall be installed between the fan and the air velocity measuring station to shut off the airflow in
duct B during evaluation of integrity in the "fan-off" condition.
4.8 Air velocity measuring station
This shall determine air velocity in duct B and shall consist of one or two inlet nozzle(s), or other
suitable device, installed in a straight length of pipe sized to EN ISO 5167-1, EN ISO 5167-2 and EN
ISO 5167-3, connected to the end of both the vertical and horizontal duct B outside the furnace. The
temperature of the extracted hot gas shall be measured with a sheathed thermocouple type K according
to EN 60584-1, max. 2 mm in diameter, with an insulated hot junction, arranged pointing upwards to
allow for draining moisture. Its measuring junction shall be located at the centre line of the pipe and at a
maximum distance of 100 mm downstream from the flange. If larger distance is necessary, the pipe
between flange and measuring point shall be insulated.
4.9 Equipment for measuring gas pressure
This shall be provided in the laboratory, in the furnace and inside duct A. The measuring equipment for
measuring pressures differentials between duct A and the laboratory shall be provided with an
accuracy of
± 5 % relative to the intended pressure difference, i.e. 300 or 500 Pa.
4.10 Thermal expansion/contraction measuring device
This shall be provided for measuring longitudinal expansion/contraction of duct A and shall have an
accuracy of ± 1 mm.
This measurement shall be at (400 ± 50) mm from the unexposed surface of the supporting
construction (knowing that elongation outside the furnace will not be taken into account).
Any interference between thermocouples and the measurement of expansion/contraction should be
avoided; in case of any such interference, placement of thermocouples takes precedence. The result of
the expansion/contraction is not taken into account for classification, but for information of the test
sponsor.
4.11 Force measuring device
If the sponsor requests the force measurement, the appropriate measuring device shall be installed at
the point of applying restraint in duct B according to Figure 18.
5 Test conditions
The heating conditions and the furnace atmosphere shall conform to those given in EN 1363-1.
The furnace pressure shall be controlled to 15 Pa throughout the test at the mid-height position of the
horizontal ducts. For vertical ducts the furnace pressure shall be controlled to 20 Pa 100 mm below the
ceiling. The tolerance of the pressure differential is given in EN 1363-1.
If horizontal ducts A and B are tested one above the other, duct B should be at the lowest position (see
Figure 8) and the furnace pressure shall be controlled to (15 ± 3) Pa at the mid height of duct B.
Details of test conditions within the ducts during the test are given in Clause 10.
6 Test specimen
6.1 Size
6.1.1 General
For duct specimens of sizes other than those given in Table 2, the field of direct application is restricted
(see Clause 13).
6.1.2 Length
The minimum lengths of the parts of the test specimen inside and outside the furnace shall be as given
in Table 1 (see also Figures 1 and 2):
Table 1 — Minimum length of test specimen
Orientation Minimum length (m)

Inside furnace Outside furnace
Horizontal 4,0 2,5
Vertical 2,0 2,0
6.1.3 Cross-section
The standard sizes of ducts given in Table 2 shall be tested unless only smaller cross-sections are used:
Table 2 — Internal cross-section of test specimen (dimension of the open cross-section)
Duct Rectangular Circular
Width (mm) Height Diameter (mm)
(mm)
A 1000 ± 10 500 ± 10 800 ± 10

B 1000 ± 10 250 ± 10 630 ± 10

6.2 Number of tests
One test specimen shall be tested for each type of installation to be evaluated.
6.3 Design
6.3.1 General
The test shall be made on a test specimen representative of the complete duct assembly on which
information is required. The method of duct construction, support and penetration shall be
representative of that used in practice.
Ducts shall be arranged as shown in Figures 1, 2 and 3.
6.3.2 Minimum distance between the ducts and between ducts and furnace walls
There is no limit to the number of ducts that may be tested simultaneously in the same furnace,
provided that there is sufficient space to do so, in accordance with the dimensions shown in Figures 1, 2
and 3.
There shall be a minimum clear spacing of 500 mm between the top of a horizontal duct and the ceiling.
A minimum clear spacing of 500 mm shall be provided between the underside of a horizontal duct and
the floor. Similarly, there shall be a minimum clear spacing of at least 500 mm between either the
adjacent duct or furnace wall. The minimum clear spacing between the branch of duct A and either the
adjacent duct or furnace wall shall be 250 mm.
6.3.3 Configuration of duct A (horizontal only)
The horizontal duct A shall include one bend, a T-piece and a 500 mm long length of duct to form a short
branch duct having a cross-section of 250 mm x 250 mm for rectangular ducts (Ø 250 mm for circular
ducts), and shall be arranged as shown in Figures 2 and 3. All specimens including this branch shall be
mounted with the suspension or fixing devices as used in practice.
NOTE Figure 14 is an example for a sectional bend.
6.3.4 Openings in duct B
Two openings equal in size shall be provided, one on each vertical side of the duct inside the furnace.
For horizontal ducts the openings shall be positioned (500 ± 25) mm from the end of the duct inside the
furnace (see Figures 2 and 3). For vertical ducts the openings shall be positioned (200 ± 10) mm below
the furnace roof (see Figure 1).
In both vertical and horizontal ducts, clear openings shall have the same width/height ratio as the
cross-section of the duct. For circular ducts, the openings shall be rectangular with a width/height
ration of 4:1. The total area of the openings shall be 50 % ± 10 % of the internal cross sectional area of
the duct. Framing of the openings shall be as in practise (to avoid weakening the duct walls in the area
around the openings).
6.3.5 Access panel
If an access panel is to be tested in a horizontal duct, it shall be mounted in the first straight duct piece
after the T-piece (duct A) resp. the first straight duct piece after the penetration of the supporting
construction (duct B) (see Figures 1 to 3). The access panel shall be located in the underside of the duct.
If an access panel is to be tested in a vertical duct, the nearest edge shall be positioned (200 ± 10) mm
below the supporting construction (duct A), resp. in the first duct piece after the penetration of the
supporting construction (duct B). The access panel shall be located in the widest side of the duct.
Any interference between thermocouples and the access panel should be avoided; in case of any such
interference, placement of thermocouples takes precedence.
6.3.6 Joints in horizontal ducts
The test configuration shall include at least one joint inside the furnace and at least one joint outside it.
There shall be at least one joint in every layer of fire protection material (if applicable), both inside and
outside the furnace and in any steel duct.
Outside the furnace, the joint in the outer layer of the fire protection material shall be no further than
700 mm from the supporting construction and no nearer than 100 mm to thermocouples T . Inside the
furnace, the joint in the outer layer of fire protection material shall be located at approximately mid-
span.
The distance between joints and suspension devices shall not be less than that used in practice. If the
minimum distance has not been specified, suspension devices shall be arranged so that the joint of the
outermost layer at the bottom of the insulation material (if no insulation material is present: joint of the
steel duct) lies midway between them. Centres of the suspension devices shall be specified by the
manufacturer and shall be representative of practice.
6.3.7 Joints in vertical ducts
The test configuration shall include at least one joint inside and one joint outside it (see Figure 1).
There shall be at least one joint for every layer of fire protection material, both inside and outside the
furnace and in any steel duct.
Outside the furnace, the joint in the outer layer of the fire protection material shall be no further than
700 mm from the supporting construction and no nearer than 100 mm to thermocouples T . Inside the
furnace, the joint in the outer layer of fire protection material shall be located at approximately mid-
span.
6.3.8 Support for vertical ducts
Vertical ducts shall be supported on the furnace floor and penetrate through the supporting
construction (see Figure 1); the ducts shall be fixed at the level of the supporting construction as they
would be fixed in practice when penetrating a floor. This shall be as specified by the sponsor.
6.3.9 Compensators
If compensators are required in practice, they shall be incorporated in the test specimen. The
compensator shall be located within the furnace for duct A, and for duct B outside the furnace
approximately 1000 mm from the wall or floor. In cases where compensator and access panel are
included in one test specimen, the placement of the compensator takes precedence (access panel shall
be located (300 ± 50) mm from the end of the compensator).
On request of the sponsor, an additional compensator may be located in duct B inside the furnace (1000
mm away from the supporting construction).
6.3.10 Steel ducts
Where steel ducts are used, the sponsor of the test shall provide the laboratory with evidence of the
leakage class in accordance with EN 1507 or EN 12237.
6.3.11 Hangers
When protected hangers are used for the test, they shall be insulated over their complete length.
7 Installation of test specimen
7.1 General
The test specimen shall be installed, as far as possible, in a manner representative of its use in practice.
The supporting construction selected shall be a wall, partition or floor either selected from the standard
supporting constructions in 7.2 or of the type to be used in practice which shall have a classified fire
resistance equal or greater than the intended fire resistance of the duct being tested.
Where the duct passes through an opening in the furnace wall or roof, then the opening shall be of
sufficient dimensions to allow for the supporting construction to surround all faces of the duct by at
least 200 mm in case of rigid supporting constructions.
In case of flexible supporting walls, the flexible walls shall have minimum dimensions of 2500 mm x
2500 mm and have one fixed and one free vertical edge (for free edge see EN 1364-1:1999, 6.3.2). The
horizontal clear spacing between the outer edge of the penetration and the free edge of the flexible
supporting construction shall be (500 ± 50) mm. The clear vertical spacing between the top of the
flexible supporting construction and the top of the outer edge of the penetration shall be at least 500
mm (see also Figure 15)
7.2 Standard supporting construction
Where the type of supporting construction to be used in practice is not known then one of the standard
supporting constructions in Tables 3 and 4 or as described in the text below shall be used.
Table 3 — Standard rigid wall constructions
Type of Thickness Density Test duration t
construction mm kg/m h
Normal 110 ± 10 2200 ± 200 t ≤ 2
concrete/
150 ± 10 2200 ± 200 2 < t ≤ 3
masonry
175 ± 10 2200 ± 200 3 < t ≤ 4
Aerated 110 ± 10 650 ± 200 t ≤ 2
a)
concrete
150 ± 10 650 ± 200 2 < t ≤ 4
a)
This supporting construction may be made from blocks, bonded together with mortar
or adhesive.
A standard flexible wall construction shall be selected from the specifications as described in detail in
EN 1363-1.
Table 4 — Standard floor constructions
Type of Thickness Density Test duration t
construction mm kg/m h
Normal concrete 110 ± 10 2200 ± 200 t ≤ 1,5
150 ± 10 2200 ± 200 1,5 < t ≤ 3
175 ± 10 2200 ± 200 3 < t ≤ 4
Aerated concrete 125 ± 10 650 ± 200 t ≤ 2
150 ± 10 650 ± 200 2 < t ≤ 4
For testing purposes: The deflection of the floor construction may be reduced, i.g. by supporting it by I-
beams. If a vertical duct passes the top floor the floor construction may be reinforced except 200 mm
around the opening.
7.3 Non-standard supporting constructions
When the test specimen is intended to be used in a form of construction not covered by the standard
supporting constructions, it shall be tested in the supporting construction in which it is intended to be
used.
7.4 Fire stopping
The fire stopping of the penetration through the supporting construction shall be as intended in
practice. The maximum width of the gap between the duct and the wall shall be accommodated as used
in practice.
7.5 Unsupported vertical ducts
Where, in practice, vertical ducts are not fixed to each floor, the test specimen shall be suitably loaded to
simulate the weight of the remaining height of unsupported ducting. Rules given in EN 15882-1 shall be
followed.
NOTE Mechanical hazards may arise from this additional loading for the personnel.
7.6 Restraint of ducts
7.6.1 Inside the furnace
All ducts shall be fully restrained in all directions at the furnace wall or floor remote from the
penetration point. Where there is the possibility of the furnace wall moving then the fixings shall be
made independently of the furnace structure.
7.6.2 Outside the furnace
Only horizontal duct B shall be restrained outside the furnace. The restraining point shall be located at a
position (2000 ± 200) mm from the supporting construction and shall provide restraint on movement
in horizontal direction but shall allow movement in vertical direction (see Figure 18). The frame used to
apply the restraint shall be rigid and have sufficient strength to resist all horizontal forces.
For test purposes the horizontal movement of the top edge of the vertical ducts A and B shall be
prevented.
8 Conditioning
8.1 General
Conditioning of the test construction shall be in accordance with EN 1363-1.
8.2 Water-based sealing materials
Water-based materials (e.g. mortar, concrete …) used to seal the gap between the supporting
construction and the duct where the gap is ≤ 25 mm wide shall be conditioned for at least seven days
before fire testing.
Water-based materials used to seal the gap between the supporting construction and the duct assembly
where the gap is > 25 mm wide shall be conditioned for at least 28 d before fire testing.
9 Application of instrumentation
9.1 Thermocouples
9.1.1 Furnace thermocouples (plate thermometers)
Plate thermometers shall be provided in accordance with EN 1363-1 and shall be positioned as shown
in Figures 6 to 8.
For all ducts, the plate thermometers shall be oriented so that side ‘A’ faces the walls of the furnace
opposite the ducts being evaluated.
9.1.2 Unexposed surface thermocouples
9.1.2.1 General
The temperature of the test specimens shall be measured with thermocouples as described in EN 1363-
1. The position of thermocouples (for measuring maximum and / or average temperature, T and T ) at
1 2
the point of penetration of the duct through the wall or floor is shown in Figures 9 to 11 for a number of
different penetration details. At least one thermocouple (T ) of each type shall be positioned on each
i
side of a rectangular duct – circular ducts shall be measured analogously.
Thermocouples shall be located where a discontinuity in thickness of insulation or wall thickness of the
duct occurs. This includes additional fillets, strips etc. (see Figures 9 to 11).
9.1.2.2 Maximum temperature rise
Additional thermocouples T for determining maximum temperature rise shall be located in positions
on the outer surface of the fire protection material to coincide with the first joints of each layer (see also
Figure 16). Additional thermocouples shall be positioned over the first steel duct joint on the unexposed
side (outer layer). None of these thermocouples shall be closer to the penetration than 25 mm.
9.1.2.3 !Kitchen extract ducts or ducts with internal combustible linings
For kitchen extract ducts or where combustible internal linings are used, four additional
thermocouples, reference T , shall be fixed inside duct A, at a position of approximately mid-span within
the part of the duct exposed within the furnace. The thermocouples shall be fixed to the inside face of
the duct at the locations shown in Figure 12. The thermocouples shall not coincide with joints or cover
strips."
9.1.2.4 Compensating devices
Where compensating devices have been incorporated, thermocouples shall be located on the outer
surface of the compensator in duct B. These shall be used to check compliance with the maximum
temperature rise limits only.
9.1.2.5 Suspension device
Where steel suspension devices are protected, then their temperatures shall be measured. A
thermocouple shall be positioned on each component of at least two suspension device systems (see
13.6.2)
9.1.2.6 Access panel
Additional thermocouples on access panels shall be arranged as shown in Figure 13.
9.2 Pressure
Furnace pressure shall be measured in accordance with Clause 5.
10 Test procedure
10.1 General
Before the test the leakage of the laboratory measuring and condensing system shall be measured, and
the system leakage shall be deducted from the total measuring leakage throughout the test.
The test shall be carried out using the equipment and procedures in accordance with EN 1363-1.
10.2 Control of conditions to permit assessment of integrity
10.2.1 Duct A
Control the underpressure inside duct A (see Figure 4) to (300 ± 15) Pa (or (500 ± 15) Pa if required by
the test sponsor) below the laboratory pressure at the beginning of the test and maintain it at this value
throughout the test.
If used as a smoke extraction duct, the duct shall be tested in accordance with EN 1366-8. In this case,
Fan A shall be adjusted to (500 +/- 15) Pa for testing duct a according to this standard.
10.2.2 Duct B
Prior to the start of the test stabilise the air velocity in duct B (see Figure 5) to 3m/s. Adjust the fan
during the "fan on" parts of the test to maintain the velocity of (3 ± 0,45) m/s. If the air temperature in
the duct is used in the calculation of the velocity, the temperature measured after the duct (Figure 5, No.
7) shall be used for the calculation. The temperature measurement shall be taken no further than 100
mm from the end of the duct; if a larger distance is needed, the connecting pipe shall be insulated.
25 min after the commencement of the test according to EN 1363-1, open the fan by-pass vent and then
shut the damper whilst leaving the fan running. Allow two minutes for the conditions to stabilise in duct
B.
Make an assessment of integrity of the duct assembly outside the furnace in the simulated "fan off"
situation for a period of 3 min. Then re-open the damper and close the by-pass vent. The damper shall
be opened or shut in not less than 10 s and not more than 20 s. Check that velocity of the fan is within
the limits defined above.
Repeat this procedure five minutes before the completion of every 30-minute period of the test. Make
assessments of integrity in the damper open position (fan-on situation) at all other times.
10.3 Test measurements and observations
10.3.1 Integrity
10.3.1.1 For ducts A and B including where the ducts pass through the wall or floor:
Evaluate the test specimen for integrity as given in EN 1363-1. Table 5 summarises the evaluation
required to assess integrity.
Table 5 — Summary of appropriate integrity evaluation
Duct Within Furnace Outside Furnace

Duct A Volume flow rate Volume Flow Rate
(Fire outside duct) Cotton Pad
Openings
Flaming
Duct B -------- Cotton Pad
(Fire inside duct) Openings
Flaming
10.3.1.2 For duct A only:
Record the pressure differential across the venturi, orifice plate, etc. at not more than 60 s intervals
throughout the test.
Calculate the leakage from the recorded pressure differential from the venturi, orifice plate, etc. using
the formulae for volume flow rates given in EN ISO 5167-1, EN ISO 5167-2 and EN ISO 5167-3. The
calculation shall be related to normal temperature (20 °C) and normal pressure (1013 mbar).
10.3.2 Insulation
Measure the average and maximum temperatures of the unexposed faces of the test specimens as
specified in EN 1363-1. Use a roving thermocouple to locate points of high temperature not covered by
the fixed thermocouples, at locations where the duct is outside the furnace only.
10.3.3 Thermal expansion/contraction and restraint forces
10.3.3.1 For horizontal duct A only
Measure and record the thermal expansion/contraction in axial direction at the penetration point and
at the unexposed end of the duct (see Figure 17).
10.3.3.2 For horizontal duct B only
If requested by the sponsor the restraint force in horizontal duct B shall be measured and recorded at
the point of application of the restraint outside the furnace (see Figure 18) using the device described in
4.11.
10.3.4 Additional observations
Throughout the test, make observations of all changes and occurrences which do not affect the
performance criteria but which could create hazards in a building, including, for example:
a) deflections; this shall cover the general behaviour of the duct e.g. the direction in which it is
deflecting. Precise measurements are not required;
b) the emissions of smoke from the unexposed face of the duct. This may, for example, be attributable to
its coverings and/or lining. Only limited observations may be possible in view of the highly
subjective nature of such observations;
c) the time when the suspension or fixing devices can no longer retain the duct or its sections in its
intended position.
10.4 Termination of the test
Terminate the test for the reasons given in EN 1363-1.
11 Performance criteria
11.1 Integrity
Integrity failure shall be deemed to have occurred if any of the following are observed:
a) integrity failure on the unexposed side as defined in EN 1363-1,
3 2
b) the volume flow rate measured in duct A exceeds 15 m /(m h), related to 20 °C and 1013 mbar,
related to the internal surface area of the duct inside the furnace.
11.2 Insulation
11.2.1 General
Insulation failure shall be as defined in EN 1363-1.
Only thermocouples T shall be used to determine the average temperature rise. Thermocouples T , T ,
2 1 2
T , and the roving thermocouple shall be used to determine the maximum temperature rise.
s
If applicable, thermocouples T on the duct around an access panel shall be used to determine the
AP,1
maximum temperature rise and T on the access panel shall be used to determine the maximum and
AP,2
average temperature rise of the access panel.
Insulation failure on thermocouples for the access panel (T ) shall be regarded as insulation failures
AP
for these devices only and not for the whole duct system.
For compensators, only the maximum temperature rise (T ) shall be measured on all relevant places
CO,1
where a discontinuity in shape of the compensator (in analogy to a penetration) occurs.
11.2.2 !Additional criteria for kitchen extract ducts or ducts with internal combustible linings
Insulation failure shall be as defined in EN 1363-1.
For this purpose, thermocouples T3 shall be used to determine the average and maximum temperature
rise. Positioning of these thermocouples is indicated in Figure 12."
11.3 Smoke leakage
Failure of this criterion shall have occurred if the flow rate in duct A during the test exceeds
3 2
10 m /(m h), related to 20 °C and 1013 mbar, related to the internal surface area of the duct inside the
furnace.
12 Test report
In addition to the items required by EN 1363-1, the following shall also be included in the test report.
a) a reference that the test was carried out in accordance with EN 1366-1;
b) the method of fixing, support and mounting, as appropriate for the type of test specimen;
c) a description of the method and materials used to seal the gap between the duct and opening
provided in the wall or floor to accommodate the duct;
d) the details of the supporting construction and, where vertical ducts are loaded, give details of the
load applied;
e) the thermal expansions / contractions measured;
f) other observations made during the test according to 10.3.3, including a complete record of the
following test parameters as a function of time:
For Duct A:
1) the calculated volume flow in duct A
2) pressure difference between the inside the of the duct and the laboratory
3) gas temperature measured at measuring station (item 12 on Figure 4)
For Duct B
1) the calculated volume flow in duct B
2) the gas temperature measured at the exit point
(item 7 on Figure 5)
g) performance achieved in relation to 11.3;
h) where steel ducts are used, the thickness, leakage class to EN 1507, and whether any external
stiffening or internal stiffeners were incorporated.
13 Field of direct application of test results
13.1 General
The field of direct application only covers circular and four sided rectangular ducts.
13.2 Vertical and horizontal ducts
A test result obtained for horizontal ducts A and B is applicable to horizontal ducts only.
A test result obtained for vertical ducts A and B is applicable to vertical ducts without branch.
A test on horizontal duct A, which includes a branch duct, also covers the use of branches on previously
tested vertical ducts. These test results cover the forms of T-pieces, branches and direction changing
pieces using the same jointing technique.
13.3 Sizes of ducts
A test result obtained for the standard sizes of duct A and duct B specified in Tables 1 and 2 is
applicable to all dimensions up to the maximum nominal internal sizes given in Table 6.
Table 6 — Maximum nominal internal dimensions of ducts tested as defined in Table 2
permitted under direct application
Rectangular Rectangular Circular
width mm height mm diameter mm

duct size 1250 1000 1000
For ducts tested at a
...