oSIST prEN 1366-8:2019

SLOVENSKI STANDARD
01-maj-2019
Preskusi požarne odpornosti servisnih inštalacij - 8. del: Kanali za odvod dima
Fire resistance tests for service installations - Part 8: Smoke extraction ducts
Feuerwiderstandsprüfungen für Installationen - Teil 8: Entrauchungsleitungen
Essais de résistance au feu des installations de service - Partie 8 : Conduits d’extraction
de fumées
Ta slovenski standard je istoveten z: prEN 1366-8
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.

DRAFT
EUROPEAN STANDARD
NORME EUROPÉENNE
EUROPÄISCHE NORM
March 2019
ICS 13.220.20; 13.220.50 Will supersede EN 1366-8:2004
English Version
Fire resistance tests for service installations - Part 8:
Smoke extraction ducts
Essais de résistance au feu des installations de service - Feuerwiderstandsprüfungen für Installationen - Teil 8:
Partie 8 : Conduits d'extraction de fumées Entrauchungsleitungen
This draft European Standard is submitted to CEN members for enquiry. It has been drawn up by the Technical Committee
CEN/TC 127.
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, Former Yugoslav Republic of Macedonia, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania,
Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Serbia, Slovakia, Slovenia, Spain, Sweden, Switzerland,
Turkey 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

CEN-CENELEC Management Centre: Rue de la Science 23, B-1040 Brussels
© 2019 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1366-8:2019 E
worldwide for CEN national Members.

Contents Page
European foreword 4
Introduction 5
1 Scope 6
2 Normative references 6
3 Terms and Definitions 7
4 Caution 8
5 Test equipment 8
5.1 General 8
5.2 Furnace 8
5.3 Perforated plate 8
5.4 Inlet nozzles 9
5.5 Ambient temperature leakage measuring device 10
5.6 Pressure sensors for differential pressure control 10
5.7 Welded connecting duct 10
5.8 Extraction fan 10
5.9 Thermocouples 10
5.10 Surface thermocouples 10
5.11 Oxygen measuring equipment 10
5.12 Oxygen measurement probes 10
5.13 Restraining equipment 11
5.14 Deflection measurements 11
6 Test conditions 11
7 Test specimen 11
7.1 Size 11
7.1.1 General 11
7.1.2 Length 11
7.1.3 Cross-section 11
7.2 Number 12
7.3 Design 12
7.3.1 General 12
7.3.2 Openings in duct 12
7.3.3 Joints in horizontal ducts 12
7.3.4 Joints in vertical ducts 12
7.3.5 Support for vertical ducts 13
7.3.6 Compensators 13
7.3.7 Access panels 13
8 Installation of test specimen 13
8.1 General 13
8.2 Standard supporting construction 14
8.3 Restraint of ducts 14
8.3.1 Inside the furnace 14
8.3.2 Outside the furnace 14
9 Conditioning 14
9.1 General 14
9.2 Water-based sealing materials 14
10 Application of instrumentation 14
10.1 Thermocouples 14
10.1.1 Furnace thermocouples (plate thermometers) 14
10.1.2 Unexposed surface thermocouples 15
10.1.3 Gas temperature adjacent to nozzles 15
10.2 Pressure 15
10.2.1 Furnace pressure 15
10.2.2 Differential under-pressure in duct 15
10.3 Oxygen measurements 15
10.4 Deflection measurement for determination of reduction in internal cross section area15
11 Test procedure 17
11.1 General 17
11.2 Pre-test calibration of the perforated plate 17
11.3 Test at ambient temperature 17
11.4 Pre-fire test procedures 18
11.5 Fire test 18
12 Performance criteria 19
12.1 General requirements 19
12.2 Criteria at ambient temperature 20
12.2.1 Ambient leakage 20
12.2.2 Reduction in internal cross-section area under ambient conditions outside the
furnace 20
12.3 Criteria under fire conditions 20
12.3.1 General 20
12.3.2 Leakage (Integrity) 20
12.3.3 Integrity 20
12.3.4 Insulation 20
12.3.5 Smoke-Leakage 20
12.3.6 Reduction in internal cross-section area under fire conditions 20
12.3.7 Mechanical stability 21
13 Test report 21
14 Field of direct application of test results 22
14.1 General 22
14.2 Vertical and horizontal ducts 22
14.3 Sizes of ducts 22
14.4 Supporting construction 22
Annex A (informative) Measurement of volume/mass flow 38
Annex B (informative) Measurement of oxygen content Details on measuring oxygen content
with parametric cell analysers 43
Annex C (informative) The usage of correction factors for the consideration of different
parameters 46
Bibliography 51
European foreword
This document (prEN 1366-8:2019) has been prepared by Technical Committee CEN/TC 127
“Fire safety in buildings”, the secretariat of which is held by BSI.
This document is currently submitted to the CEN Enquiry.
This document will supersede EN 1366-8:2004.
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: Closures for conveyors and trackbound transportation systems;
— 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.
Introduction
This document has been prepared because a method of test for fire resisting smoke extraction
ducts has become necessary to evaluate the ability of fire resisting ducts already tested to
EN 1366-1 to function adequately as smoke extraction ducts.
Leakage is measured at both ambient and elevated temperatures. 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 elevated temperatures, oxygen measuring
techniques are used.
The method described in this test is complex and requires sophisticated instrumentation. It is
not recommended therefore to try to test multiple assemblies in this test.

1 Scope
This document specifies a test method for determining the fire resistance of smoke extraction
ducts. It is applicable only to smoke extraction ducts that pass through another fire
compartment from the fire compartment to be extracted in case of fire. It represents fire
exposure of a fully developed fire.
This method of test is only applicable to ventilation ducts with the following classification
according to EN 13501-3:
— fire from inside and outside i ↔ o;
— applicable to a pressure difference up to 500 Pa;
NOTE 1 Requires that the duct A test(s) has been preformed with an under-pressure of minimum
500 Pa.
— with integrity (E) and insulation (I) criteria equal to or higher than the intended
classification for the smoke extraction duct.
NOTE 2 According to: EN 13501–4:2009/A1:2009 Multi-compartment smoke extraction duct can only
be classified as EI.
For the purposes of the test described in this document, the duct is referred to as duct C.
This test method has been designed to cover both vertical and horizontal smoke extraction
ducts. A vertical system need not be evaluated to this method provided that:
— both horizontal (ho) and vertical (ve) classification according to EN 13501-3 has been
obtained for the ventilation duct, and
— it has been tested in a horizontal orientation to this method.
If the ventilation duct in practice is only used for vertical applications in smoke extraction
systems, only vertical (ve) classification is bound to be used and tested in a vertical orientation
to this method according to EN 13501-3.
This test method is suitable for ducts constructed from non-combustible materials (Euroclass
A1 and A2).
NOTE 3 Using combustible material could lead to an incorrect calculation of the leakage based on the
oxygen measurement. E.g. galvanisation could lead to some negative effects for the measurements.
It is applicable only to four sided ducts; one, two and three sided ducts are not covered.
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 60584-1, Thermocouples - Part 1: EMF specifications and tolerances (IEC 60584 1)
EN ISO 13943, Fire safety - Vocabulary (ISO 13943)

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 terminological databases for use in standardization at the following
addresses:
• IEC Electropedia: available at http://www.electropedia.org/
• ISO Online browsing platform: available at http://www.iso.org/obp
3.1
smoke extraction duct
duct used for the extraction of smoke in case of fire and designed to provide a degree of fire
resistance
3.2
fire-resistant ventilation duct
duct used for the distribution or extraction of air and designed to provide a degree of fire
resistance
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 through which the duct passes in the test
3.7
compensator
device used to prevent damage from the forces generated by expansion
3.8
access panel
cover for an inspection opening within the duct
3.9
fire protected steel duct
steel duct with an external insulation to provide fire resistance
3.10
internal surface area with under-pressure
surface area of the duct from the perforated plate to the end of the duct by the inlet nozzles
including the endplate where the nozzles is positioned and excluding the surface of the
perforated plate
3.11
total internal surface area
full internal area of the duct including both end plates

4 Caution
The attention of all persons concerned with managing and carrying out this fire resistance test is
drawn to the fact that fire testing can be hazardous and that there is a possibility that toxic
and/or harmful smoke and gases might be evolved during the test. Mechanical and operational
hazards might 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 shall be made and safety precautions
shall be identified and provided. Written safety instructions shall be issued. Appropriate
training shall be given to relevant personnel. Laboratory personnel shall ensure that they follow
written safety instructions at all times.
5 Test equipment
5.1 General
In addition to the test equipment specified in EN 1363-1 the following is required:
5.2 Furnace
This 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 (see
Figure 1) or vertical (see Figure 2) orientation.
It is required that the construction of furnace shall allow observation of at least 75 % of the test
specimen.
5.3 Perforated plate
The perforated plate controls the flow through the duct so the required differential pressure, see
Table 1, can be achieved. 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. The
plate shall be positioned (250 ± 50) mm from where the duct passes through the furnace wall or
roof, see Figures 1 and 2.
The plate shall be made from austenitic heat-resisting steel (grade number 1.4835) in
accordance with EN 10095 Heat resisting steels and nickel alloys. The number of holes and
dimensions are given in Tables 2 and 3. The thickness of the plates shall be 2,5 ± 0,5 mm.
NOTE 1 Table 2 gives details of perfor
...