SIST EN 1366-9:2024

SLOVENSKI STANDARD
01-december-2024
Nadomešča:
SIST EN 1366-9:2008
Preskusi požarne odpornosti servisnih inštalacij - 9. del: Kanali za odvod dima iz
enega požarnega sektorja
Fire resistance tests for service installations - Part 9: Single compartment smoke
extraction ducts
Feuerwiderstandsprüfungen für Installationen - Teil 9: Entrauchungsleitungen für einen
Einzelabschnitt
Essais de résistance au feu des installations techniques - Partie 9 : Conduits d'extraction
de fumées relatifs à un seul compartiment
Ta slovenski standard je istoveten z: EN 1366-9:2024
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 1366-9
EUROPEAN STANDARD
NORME EUROPÉENNE
October 2024
EUROPÄISCHE NORM
ICS 13.220.50; 91.140.30 Supersedes EN 1366-9:2008
English Version
Fire resistance tests for service installations - Part 9:
Single compartment smoke extraction ducts
Essais de résistance au feu des installations techniques Feuerwiderstandsprüfungen für Installationen - Teil 9:
- Partie 9 : Conduits d'extraction de fumées relatifs à un Entrauchungsleitungen für einen Einzelabschnitt
seul compartiment
This European Standard was approved by CEN on 2 September 2024.

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
© 2024 CEN All rights of exploitation in any form and by any means reserved Ref. No. EN 1366-9:2024 E
worldwide for CEN national Members.

Contents Page
European foreword . 5
Introduction . 7
1 Scope . 8
2 Normative references . 8
3 Terms and definitions . 9
4 Test equipment . 10
4.1 General. 10
4.2 Furnace . 10
4.3 Perforated plate . 10
4.4 Air velocity measuring station . 11
4.5 Ambient temperature leakage measuring device . 11
4.6 Pressure sensors for differential pressure control . 11
4.7 Welded connecting tube . 11
4.8 Extract fan connecting duct . 11
4.9 Extraction fan . 12
4.10 Thermocouples . 12
4.11 Oxygen measuring equipment . 12
4.12 Oxygen measurement probes . 12
4.13 Restraint equipment . 12
4.14 Deflection measurements . 12
5 Test conditions . 12
5.1 Differential pressure conditions . 12
5.2 Heating and pressure conditions . 12
6 Test specimen . 13
6.1 Size . 13
6.1.1 Length. 13
6.1.2 Cross-section . 13
6.2 Number . 13
6.3 Design . 13
7 Installation of test specimen . 14
7.1 General. 14
7.2 Supporting construction . 14
7.3 Duct arrangement . 14
7.4 Restraint of ducts . 14
7.4.1 Inside the furnace . 14
7.4.2 Outside the furnace . 14
7.5 Perforated plate . 15
8 Conditioning . 15
8.1 General. 15
8.2 Water based sealing materials . 15
9 Application of instrumentation . 15
9.1 Thermocouples . 15
9.1.1 Furnace thermocouples (plate thermometers) . 15
9.1.2 Gas temperature within flow nozzles . 15
9.2 Pressure . 15
9.2.1 Furnace pressure . 15
9.2.2 Differential under-pressure in duct . 15
9.3 Oxygen measurements . 16
9.4 Deflection measurement for determination of reduction of internal cross-sectional area
............................................................................................................................................................................. 16
10 Test procedure . 17
10.1 Pre-test adjustment . 17
10.1.1 Oxygen-measuring instrument . 17
10.1.2 Perforated plate . 17
10.2 Leakage measurement at ambient temperature. 17
10.3 Pre-fire test procedures . 18
10.4 Fire test. 18
10.5 Termination of test . 19
11 Performance criteria . 20
11.1 General requirements . 20
11.2 Criteria at ambient temperature . 20
11.2.1 Ambient leakage . 20
11.2.2 Maintenance of cross-section under ambient conditions outside the furnace . 20
11.3 Criteria under fire conditions . 20
11.3.1 General . 20
11.3.2 Integrity . 20
11.3.3 Smoke leakage . 21
12 Test report . 21
13 Direct field of application of test results . 21
13.1 General . 21
13.2 Duct sizes . 22
13.3 Suspension device . 22
13.4 Pressure difference . 22
13.5 Vertical part of duct . 22
13.6 Steel ducts . 22
Annex A (informative) Measurement of volume/mass flow . 36
A.1 Hints on measuring volume flow or mass flow with differential pressure devices . 36
A.2 Density . 36
A.3 Absolute pressure (barometric pressure) . 36
A.4 Viscosity . 37
A.5 Characteristic data of the inlet nozzles according to Figure 10 . 37
Annex B (informative) Measurement of oxygen content . 40
B.1 Details on measuring oxygen content with parametric cell analysers . 40
B.2 Choice of O measuring devices . 40
B.3 Effect of O measuring device errors . 41
B.4 Zero and end point drift . 41
B.5 Details on the creation of an oxygen content from 12,5 to 13,5 vol % within the furnace 43
Annex C (informative) The usage of correction factors for the consideration of different
parameters . 44
C.1 Details for the development of the correction factors and their error limits . 44
C.2 The complete formula for the leakage mass flow and the parameters . 44
C.3 Application of correction factors in the simple mass flow formulae and achievable accuracy
............................................................................................................................................................................. 47
Bibliography . 49

European foreword
This document (EN 1366-9:2024) 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 April 2025, and conflicting national standards shall be
withdrawn at the latest by April 2025.
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 1366-9:2008.
In comparison with the previous edition, the following technical modifications have been made:
— method for determination of reduction in internal cross-sectional area was added;
— positions for measurement of deflection of cross-section outside furnace were defined;
— introduction of an alternative oxygen sampling probe;
— use of two separate O analysers based on paramagnetic measurement method for the two sampling
points is mandatory;
— direct field of application for vertical parts of duct within the smoke compartment was added,
without penetrating any wall/floor where fire resistance is required;
— details of holes in perforated plate for circular ducts were included in figures;
— standard for gas temperature thermocouples were added;
— location of compensators (if used) were amended.
This document has been prepared under a standardization request addressed to CEN by the European
Commission. The Standing Committee of the EFTA States subsequently approves these requests for its
Member States.
EN 1366, Fire resistance tests for service installations consists of the following parts:
— 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 access and hollow core 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
— Part 11: Fire protective Systems for cable systems and associated components
— Part 12: Non-mechanical fire barrier for ventilation ductwork
— Part 13: Chimneys
— Part 14: Partial penetration seals
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
This part of this European Standard has been prepared because a method of test for smoke extraction
ducts used in single compartment applications has become necessary. This test exposes a smoke
extraction duct to conditions intended to represent the pre-flashover stage of a fire.
Leakage is measured at both ambient temperature and exposure at 600 °C. During the tests, air/gases are
drawn through the duct at a differential pressure between the inside and outside of the duct. Leakage is
determined at ambient temperature by sealing the openings in the duct located in the furnace and taking
flow measurements through a flow measuring device located just before the extraction fan. With respect
to determining leakage at 600 °C, oxygen-measuring techniques are used.
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 part of EN 1366 specifies a test method for determining the fire resistance of smoke extraction ducts
that are used for single compartment applications only. In such applications, the smoke extraction system
is only intended to function up to flashover (typically 600 °C).
This method of test is only suitable for ducts constructed from non-combustible materials (class A1 and
A2-s1, d0 according to EN 13501-1).
It is applicable only to four sided and circular ducts. One-, two- and three-sided ducts are not covered.
This document is applicable only for the standard sizes or smaller as described.
This test method of part 9 is applicable only to smoke extraction ducts that do not pass into other fire
compartments. For smoke extraction ducts that pass into other compartments, the method of test
described in EN 1366-8 is used.
The smoke extraction duct is part of the smoke extraction system which also includes smoke control
dampers and smoke extract fans.
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 1366-1, Fire resistance tests for service installations — Part 1: Ventilation 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 10095, Heat resisting steels and nickel alloys
EN 13501-4, Fire classification of construction products and building elements — Part 4: Classification
using data from fire resistance tests on components of smoke control systems
EN 60584-1, Thermocouples — Part 1: EMF specifications and tolerances (IEC 60584-1)
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)
ISO 10294-3:1999, Fire resistance tests — Fire dampers for air distribution systems — Part 3: Guidance on
the test method
EN ISO 13943, Fire safety — Vocabulary (ISO 13943)
ISO 5221, Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air handling
duct
3 Terms and definitions
For the purposes of this document, the terms and definitions given in EN 1363-1 and EN ISO 13943 and
the following apply.
ISO and IEC maintain terminology databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https://www.iso.org/obp
— IEC Electropedia: available at https://www.electropedia.org/
3.1
single compartment smoke extraction ducts
ducts for use within single fire compartment application
3.2
suspension devices
components used for securing a duct to a load bearing structure
[SOURCE: EN 1366-8:2024, definition 3.4]
3.3
supporting construction
wall which the duct passes through in the test
3.4
single fire compartment
fire area of a single compartment building bounded by fire-resistant elements
3.5
smoke zone (zone)
area into which a construction work is divided for the extraction of smoke and hot gases and served by a
SHEVS (or sub-system of a SHEVS), which is initiated by a signal from a single or group of initiation
devices associated with the zone
3.6
compensator
device used to prevent damage to the duct and/or the structural elements (horizontal or vertical) from
the forces that are generated by the thermal expansion of the duct and/or its suspension devices
3.7
smoke and heat exhaust ventilation system
SHEVS
system consisting of products and/or components jointly selected to exhaust smoke and heat
Note 1 to entry: The products and/or components form a system in order to establish a buoyant layer of
warm gases above cooler cleaner air
[SOURCE: EN 12101-7:2011, definition 3.8]
4 Test equipment
4.1 General
In addition to the test equipment specified in EN 1363-1, the equipment in 4.2 to 4.4 is required. The
overall test arrangement is shown in Figure 1. Details of instrumentation and other details are shown in
Figures 2 to 10.
4.2 Furnace
The furnace shall be capable of subjecting smoke extraction ducts to the standard heating and pressure
conditions specified in EN 1363-1 and be suitable for testing ducts in the horizontal orientation (see
Figure 1).
4.3 Perforated plate
The perforated plate defines the under-pressure inside the duct by the air flow speed of 2 m/s in ambient
conditions. Choose the perforated plate from Figure 2 or Figure 3 to suit the required pressure level
according to Table 1. The plate shall be positioned (250 ± 50) mm from where the duct passes through
the furnace wall, see Figure 1.
The plate shall be positioned (250 ± 50) mm from where the duct passes through the furnace wall
(see Figures 1 and 2).
The plate shall be made from austenitic heat-resisting steel (grade number 1.4835 or 1.4828) in
accordance with EN 10095 Heat resisting steels and nickel alloys. The number of holes and dimensions
are given in the tables of Figure 2 and Figure 3. The thickness of the plates shall be (2,5 ± 0,5) mm.
The table in Figure 2 gives details of perforated plates for standard rectangular ducts of size
1 000 mm × 250 mm. For smaller sizes, the number of holes will be reduced proportional to the smaller
cross-section (a change to larger sizes is not permitted; see 6.1.2 and Table 3).
The table in Figure 3 gives details of perforated plates for standard circular ducts of diameter 560 mm.
For smaller sizes, the number of holes will be reduced proportional to the cross-section (a change to
larger sizes is not permitted; see 6.1.2 and Table 3).
Further details of the plate are shown in Figures 2, 3 and 4.
Table 1 — Differential pressures between inside and outside the duct for smoke extraction
ductwork
Differential pressure for fire
Operating differential pressure
a at ambient temperature
test and pre-test calibration
Pressure level
Pa
Pa
1 −500 −150
2 −1 000 −300
3 −1 500 −500
a
See Clause 5.
4.4 Air velocity measuring station
The measuring station 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. The temperature of the extracted hot gas shall be
measured with a sheathed thermocouple type K according EN 60584-1, max. 3 mm in diameter. Its
measuring junction shall be located no more than 1/4 of the pipe diameter away from the centre line of
the pipe and at a maximum distance of 2 × d of the pipe diameter downstream from the nozzle / device.
The pipe between the nozzle(s)/device shall be insulated.
The measuring device shall be capable of measuring to an accuracy of 5 % when used in ambient
conditions.
The measuring device shall be capable of measuring to an accuracy of 5 % when used in ambient
conditions and shall be suitably connected to the end of the duct.
If the measuring device consist of a venturi, orifice plate and (where necessary) an airflow straightener,
this shall be installed in straight lengths of pipe, all sized to EN ISO 5167-1, EN ISO 5167-2 and
EN ISO 5167-3.
NOTE 1 For the standard sizes of ducts specified in 6.1, an internal dimension of diameter = 160 mm of each
nozzle is suitable (Figure 10). Descriptions of similar nozzles are given in EN ISO 5167-3, EN ISO 5167-4 and
ISO 5221.
NOTE 2 Suggestion to an inlet nozzles system for standard size ducts is shown in Figures 9 and 10. The
calculation procedure is given in Annex A.
4.5 Ambient temperature leakage measuring device
The measuring device shall be capable of measuring to an accuracy of ±2,5 % and suitably mounted at
the end of the duct, connected to appropriate differential pressure measuring equipment. Descriptions of
possible measuring device are given in EN ISO 5167-1 and ISO 5221.
4.6 Pressure sensors for differential pressure control
A tube sensor as specified in EN 1363-1 shall be located at the end of the duct, inside the duct, at the level
of its centre line. A second sensor (e.g. an open end of a measuring tube) shall be located on the same
level outside the duct.
A flow control damper shall be provided for fine control for maintaining the required differential
pressure. Alternatively, another suitable device such as a variable speed fan may be used. Any flow
control damper shall be attached to the extract fan connecting duct (see 4.8).
4.7 Welded connecting tube
A fully welded duct designed to provide a gas tight connection between the inlet nozzles and the oxygen
measuring probes, shall be provided.
One end of the duct is designed to connect between the test specimen and the extraction fan. An inlet
opening may be provided if a flow control damper is used for fine control of the differential pressure. This
is shown in Figure 6, item 13.
4.8 Extract fan connecting duct
An extract fan connecting duct is a duct designed to connect between the test specimen and the extraction
fan. An inlet opening may be provided if a flow control damper is used for fine control of the differential
pressure (see 4.6).
4.9 Extraction fan
An extraction fan is a fan for extracting gas under test with a suction capacity of at least 2 × V where V
n n
is the required capacity, e.g. for a stated cross-section of V = 0,25 m × 1 m, 2 × V = 0,5 m /s.
n n
The characteristic curves of the fan shall be horizontal for the actual airflow. The capacity of the fan shall
not change by more than 10 % in the event of a drop in the pressure of up to 50 Pa.
4.10 Thermocouples
Sheathed thermocouples shall be used for measuring the gas temperature adjacent to the nozzles of
nickel chromium/nickel aluminium type K wire as defined in EN 60584-1, with a nominal diameter of
1,5 mm to 3 mm. The thermocouples shall measure with an accuracy of ±15 K. The position is shown in
Figures 5 and 6, item 15.
4.11 Oxygen measuring equipment
The oxygen concentration at points G1 and G2 shall be measured using two separate systems consisting
of O analysers based on the paramagnetic measurement method and suitable equipment for cooling,
filtering and drying the gases. Appropriate connecting tubes and probes shall be provided. The 90 %
response time of the complete system shall be 20 s maximum. The accuracy shall be equal to or better
than ±0,1 Vol-%.
4.12 Oxygen measurement probes
Steel probes for extracting the furnace gas from the inside of the duct at the locations G1 and G2 on
Figure 5. The end of the probe shall be located in the centre point of the duct cross-section.
An alternative gas probe according to Figure 11 can be used.
Both types of gas probes are described in 9.3.
4.13 Restraint equipment
Restraining equipment shall be applied as for duct B in EN 1366-1.
4.14 Deflection measurements
Deflection measurements shall be taken for determining the reduction of internal cross-sectional area at
ambient temperature and during the fire test. The measurement shall be done with an accuracy of ±1 mm.
The interval between a complete set of measurements shall not exceed 15 min, in any case near prior to
any classification time period.
NOTE Even if the deflection is measured outside the furnace, it reflects the behaviour of the cross-section of
the duct.
5 Test conditions
5.1 Differential pressure conditions
Depending on the end-use conditions, a pressure level from Table 1 shall be selected. These levels
correspond to typical values used in smoke extraction design.
5.2 Heating and pressure conditions
The heating conditions and the furnace atmosphere shall conform to those specified in EN 1363-1 (or, if
applicable, EN 1363-2) until 600 °C is reached. The mean temperature of the six furnace thermocouples
shall reach 600 °C between 5 min to 10 min from igniting the first furnace burner. After 10 min this
temperature shall be maintained with a tolerance of +70 °C and −0 °C for the rest of the test.
The furnace pressure shall be controlled to ΔP = (15 ± 3) Pa throughout the test at the mid-height position
of the duct in the furnace.
Details of test conditions within the duct during the test are given in Clause 10.
6 Test specimen
6.1 Size
6.1.1 Length
The minimum lengths of the parts of the test specimen inside and outside the furnace shall be as given in
Table 2 (see also Figure 1).
Table 2 — Minimum length of test specimen
Minimum length (m)
Orientation
Inside furnace Outside furnace
Horizontal 3,0 4,25
6.1.2 Cross-section
The sizes of duct given in Table 3 shall be tested unless smaller cross-sections are required for specific
applications.
Table 3 — Cross-section of test specimen (standard size)
Rectangular Circular
Width (mm) Height (mm) Diameter (mm)
1 000 250 560
6.2 Number
One test specimen shall be tested for each type of installation to be evaluated.
6.3 Design
The test shall be made on a test specimen representative of the complete duct. Each type of duct requires
a different approach, and an attempt shall be made to reproduce the edge conditions and the method of
fixing or support inside and outside the furnace representative of that used in practise. The distance
between hangers or supports shall be representative. Where compensators are used in practise, then
they shall be incorporated in the test specimen. In this case, the compensator shall be located outside the
furnace, approximately 500 mm downstream from the perforated plate (see Figure 5).
7 Installation of test specimen
7.1 General
The test specimen shall be installed, as far as practicable, in a manner representative of its use in practice.
The fire-stopping at the penetration through the supporting construction shall be sufficient to prevent
leakage of furnace gases. The penetration is not part of the test specimen and will not be evaluated.
Parts of the ducts within the furnace shall be exposed to fire from all sides over their whole length.
7.2 Supporting construction
Supporting construction to close the furnace shall be built from aerated concrete with a thickness of
150 mm.
7.3 Duct arrangement
7.3.1 A single duct may be tested in the furnace, or alternatively, two or more ducts may be tested in
the same furnace, provided that there is sufficient furnace power and space to do so, in accordance with
the dimensions shown in Figure 1.
7.3.2 Ducts shall be arranged as shown in Figure 1. The end of the ducts within the furnace shall be
closed by materials and construction same as the duct itself.
7.3.3 The test arrangement shall include at least one joint inside the furnace and at least one joint
outside it (see Figure 1). Any stiffeners used to maintain the cross-section of the duct shall be arranged
at the positions and centres specified by the sponsor. The distance between joint and hangers shall not
be less than intended in practise. If the minimum distance has not been specified, hangers shall be
arranged so that the joint at mid-span lies midway between them. Centres of the hangers should be
specified by the manufacturer and shall be representative of practise.
7.3.4 Two openings shall be provided, one on each vertical side of the duct inside the furnace. The
openings shall be positioned (500 ± 25) mm from the end of the duct. Each opening shall have the same
width/height ratio as the cross-section of the duct and have a total opening area of (50 ± 5) % of the
cross-sectional area of the duct. For circular ducts, the openings shall be rectangular with a width/height
ratio of 4:1. The total area of the openings shall be (50 ± 10) % of the internal cross-sectional area of the
duct.
7.3.5 There shall be a clearance of (500 ± 50) mm between the top of the duct and the ceiling and at
least 500 mm between the underside of the duct and the floor. Similarly, there shall be a clearance of at
least 500 mm between the sides of the duct and furnace walls.
7.4 Restraint of ducts
7.4.1 Inside the furnace
All ducts shall be fully restrained in all directions at the furnace wall 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.
7.4.2 Outside the furnace
The horizontal duct shall be restrained outside the furnace. The restraining point shall be located at a
position (500 ± 50) mm from the end of the duct and shall provide restraint on movement in horizontal
directions but shall allow movement in vertical directions (see Figure 7). The frame used to apply the
restraint shall be rigid and have sufficient strength to resist all horizontal forces.
7.5 Perforated plate
The perforated plate shall be located (250 ± 50) mm from the external face of the supporting
construction. Provision shall be made for the plate to be removed, if necessary during the pre-test
calibration described in 10.1.
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 7 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 days 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
Figure 8. For all ducts the plate thermometers shall be oriented so that side ‘A’ faces the walls of the
furnace opposite the duct being evaluated.
9.1.2 Gas temperature within flow nozzles
The gas temperature thermocouples (type K according to EN 60584-1) adjacent to the nozzles shall be
arranged with the measuring junction located at the centre line of each nozzle. The distance between the
measuring junctions and the inlet of the nozzle is shown in Figures 5 and 6. An alternative thermocouple
may be used provided it can be shown to have equivalent response time.
9.2 Pressure
9.2.1 Furnace pressure
Furnace pressure shall be controlled in accordance with Clause 5 and the instrumentation shall be in
accordance with EN 1363-1.
9.2.2 Differential under-pressure in duct
For measurement of the differential pressure between the inside and outside the of duct, the pressure
probe shall be located horizontally 50 mm from the end of the duct in level with the centre line of the
inlet nozzles as shown in Figures 5 and 6 as item no. D1 (pressure sensor in accordance with 4.6 or
alternative a four-point-measurement –piezometric-ring).
9.3 Oxygen measurements
Oxygen measurements shall be made using a sensor manufactured from stainless steel tube, having
approximate dimensions 6 mm outside diameter and 5 mm internal diameter, which shall be located
inside the duct (100 ± 25) mm upstream from the perforated plate on the centre line of the duct (G1). A
second sensor (G2) shall be located after the nozzles at a distance of (100 ± 25) mm on the centre line of
the connecting box (see Figures 5 and 6 for details). Each sensor is connected by suitable pipework to its
own single oxygen-measuring instrument.
Alternatively, the oxygen sensors can be manufactured from stainless steel tube, 1 200 mm long, having
approximate dimensions 10 mm outside diameter and 8 mm internal diameter. In that half opposite to
the open end of the tube, there are 20 holes of 3 mm diameter and on the half near to the open end of the
tube 20 holes of 2 mm diameter. The wholes are spaced 20 mm (see Figure 11). The tube is installed into
the wall with the wholes pointing downward the flow. For mounting the tube inside the duct, a block is
fixed to the duct wall to support the closed end of the tube. This second probe shall be located 150 mm
upstream from the duct end at mid height on the centre line.
9.4 Deflection measurement for determination of reduction of internal cross-sectional
area
The reduction of internal cross-sectional area shall be determined in 3 locations outside the furnace,
during the test at ambient temperature and during the fire test.
The three selected cross-section locations shall not be effected by the perforated plate or the end of the
duct. The locations shall be selected where the largest reductions are anticipate
...