prEN 1366-1

Fire resistance tests for service installations - Part 1: Ventilation ducts

This Part of EN 1366 is describing a method for determining the evaluation of fire resistance of vertical and horizontal ventilation ducts including those access panels, which are integral part of the tested ducts/duct walls. The test examines the behaviour of ducts exposed to fire from the outside (duct A) and fire inside the duct (duct B). This Standard is used in conjunction with EN 1363-1.

Feuerwiderstandsprüfungen für Installationen - Teil 1: Leitungen

Dieser Teil von EN 1366 beschreibt ein Verfahren für die Ermittlung der Feuerwiderstandsdauer von
vertikalen und horizontalen Leitungen einschließlich der Zugangsklappen, die ein fester Bestandteil der zu
prüfenden Leitungen/Wandungen der Leitung sind. Die Prüfung untersucht das Verhalten von Leitungen, die
einem Brand von außen (Leitung A) und einem Brand innerhalb der Leitung (Leitung B) ausgesetzt sind.
Diese Norm gilt in Verbindung mit EN 1363-1.
Anhang A enthält eine allgemeine Anleitung und führt Hintergrundinformationen auf.
Diese Europäische Norm gilt nicht für:
a) Leitungen, deren Feuerwiderstandsfähigkeit von der Feuerwiderstandsfähigkeit einer Decke abhängig ist;
b) Leitungen, die an den Durchführungsstellen von raumabschließenden Bauteilen Brandschutzklappen
enthalten;
c) Zugangsklappen, die unabhängig von den zu prüfenden Leitungen/Wandungen der Leitung beurteilt
werden;
d) zwei- oder dreiseitige Leitungen;
e) Befestigungsmittel von Abhängevorrichtungen an Decken oder Wänden.
Für die Beurteilung von Brandschutzklappen wird auf EN 1366-2 verwiesen.
Für die Beurteilung von Entrauchungsleitungen wird auf EN 1366-8 verwiesen.
Für die Beurteilung von Installationskanälen und -schächten wird auf prEN 1366-5 verwiesen.

Essais de résistance au feu des installations techniques - Partie 1: Conduits

La présente partie de l’EN 1366 prescrit une méthode de détermination de la résistance au feu des
conduits de ventilation horizontaux et verticaux, y compris les trappes de visite, qui font partie
intégrante des parois du conduit/des conduits soumis à essai. L'essai examine le comportement des
conduits exposés au feu de l'extérieur (conduit A) et de l'intérieur (conduit B). La présente norme est
utilisée avec l’EN 1363-1.
L'Annexe A fournit les lignes directives générales et donne des éléments de base.
La présente Norme européenne n’est pas applicable :
a) aux conduits dont la résistance au feu dépend de celle d’un plafond ;
b) aux conduits comportant des clapets résistant au feu aux points de traversée de séparation
résistant au feu ;
c) aux trappes de visite, dont la résistance au feu est évaluée indépendamment des parois du (des)
conduits soumis à essai ;
d) aux conduits à deux ou trois côtés ;
e) aux fixations des dispositifs de suspension sur les planchers ou les murs.
Pour l’évaluation des clapets résistant au feu, voir l'EN 1366-2.
Pour l’évaluation des conduits d'extraction de fumées, voir l'EN 1366-8.
Pour l’évaluation des gaines pour installations techniques, voir le prEN 1366-5.

Preskusi požarne odpornosti servisnih inštalacij - 1. del: Kanali

General Information

• Status: Not Published
• Publication Date: 08-Nov-2011
• ICS: 13.220.50 - Fire-resistance of building materials and elements
• Technical Committee: CEN/TC 127 - Fire safety in buildings
• Drafting Committee: CEN/TC 127/WG 2 - Services
• Current Stage: 3098 - Decision to reject - Consensus building
• Start Date: 11-May-2012
• Completion Date: 11-May-2012
• Directive: 305/2011 - Regulation (eu) No 305/2011 of the European Parliament and of the Council of 9 march 2011 laying down harmonised conditions for the marketing of construction products and repealing council directive 89/106/eec
• Directive: 89/106/EEC - Construction products
• Mandate: M/BC/CEN/91/9 - CPD: Fire resistance
• Ref Project: oSIST prEN 1366-1:2008 - Fire resistance tests for service installations - Part 1: Ducts

Relations

• Revises: EN 1366-1:1999 - Fire resistance tests for service installations - Part 1: Ducts
• Effective Date: 08-Jun-2022

Overview

prEN 1366-1 is a European standard developed by CEN/TC 127 focused on fire resistance testing for service installations, specifically ventilation ducts. This standard outlines a method for evaluating the fire resistance performance of both vertical and horizontal ventilation ducts, including integral access panels. The tests assess how ducts behave when exposed to fire from outside (duct A) or fire inside the duct (duct B). prEN 1366-1 is intended to be used alongside EN 1363-1, which provides overarching fire resistance test methods.

The main goal is to determine the duration a ventilation duct can withstand fire without compromising its integrity, insulation, or causing smoke leakage, crucial for preventing fire spread in buildings. This revised document supersedes EN 1366-1:1999 and supports essential construction product directives within Europe.

Key Topics

• Scope and Applicability
  Covers vertical and horizontal ventilation ducts, including ducts with branches, joints, openings, suspension, and penetrations. Tests apply to ducts exposed to fire both externally and internally.

• Test Setup and Conditions
  Details on furnace specifications, instrumentation (e.g., thermocouples, pressure measuring devices), and duct specimen dimensions and construction. Covers conditioning of test samples including the handling of water-based sealing materials.

• Performance Criteria
  Includes key assessment parameters:

  • Integrity: Ability to prevent flame passage.
  • Insulation: Limiting heat transfer to prevent ignition of adjacent materials.
  • Smoke Leakage: Ensuring smoke containment under fire exposure.

• Test Procedures
  Step-by-step methodology for exposing ducts to fire, controlling airflows, measurements of temperature and pressure, and criteria for test termination.

• Duct Design Considerations
  Minimum separation requirements, handling of joints, compensators, and support methods for vertical and horizontal ducts. Also addresses steel duct performance and fire stopping techniques.

• Field of Application
  Defines limitations and conditions under which test results are applicable, including duct size, pressure differences, mounting details, and vertical duct height constraints.

Applications

prEN 1366-1 is crucial for architects, building engineers, fire safety professionals, and HVAC system designers seeking to:

• Verify fire resistance of ventilation ducts used in commercial, residential, and industrial buildings.
• Ensure that ductwork complies with fire safety regulations to prevent fire and smoke spread through air distribution systems.
• Design fire-resilient ventilation installations, selecting materials and construction methods tested and certified under this standard.
• Support certification and regulatory approvals for HVAC components in Europe and other regions recognizing CEN standards.
• Evaluate the impact of openings, access panels, and joints on fire resistance performance.

This standard helps maintain occupant safety and property protection by ensuring ventilation installations contribute effectively to fire compartmentation strategies.

Related Standards

• EN 1363-1: Fire resistance tests - General requirements for fire resistance testing, used in combination with prEN 1366-1.
• EN 1366-2: Fire resistance tests for service installations - Part 2: Fire dampers.
• EN 1366-3: Fire resistance tests for service installations - Part 3: Penetration seals.
• EN 13501-2: Fire classification of construction products and building elements - Part 2: Classification using data from fire resistance tests.
• EN 13501-4: Extended application of fire classification to smoke control systems.

Utilizing prEN 1366-1 in coordination with these standards supports comprehensive fire safety evaluation for ventilation services and associated building components.

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Keywords: prEN 1366-1, fire resistance test, ventilation ducts, fire safety, fire-resistant ducts, building fire protection, ventilation fire tests, EN 1363-1, CEN standards, HVAC fire safety, smoke containment, fire compartmentation.

Standards Content (Sample)

SLOVENSKI STANDARD
01-december-2008
Preskusi požarne odpornosti servisnih inštalacij - 1. del: Kanali
Fire resistance tests for service installations - Part 1: Ducts
Feuerwiderstandsprüfungen für Installationen - Teil 1: Leitungen
Essais de résistance au feu des installations techniques - Partie 1: Conduits
Ta slovenski standard je istoveten z: prEN 1366-1
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.

EUROPEAN STANDARD
DRAFT
NORME EUROPÉENNE
EUROPÄISCHE NORM
August 2008
ICS 13.220.50 Will supersede EN 1366-1:1999
English Version
Fire resistance tests for service installations - Part 1: Ducts
Essais de résistance au feu des installations techniques - Feuerwiderstandsprüfungen für Installationen - Teil 1:
Partie 1: Conduits Leitungen
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 Management Centre has the
same status as the official versions.
CEN members are the national standards bodies of Austria, Belgium, Bulgaria, 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: rue de Stassart, 36  B-1050 Brussels
© 2008 CEN All rights of exploitation in any form and by any means reserved Ref. No. prEN 1366-1:2008: E
worldwide for CEN national Members.

Contents Page
Foreword. 4
Introduction . 5
1 Scope. 6
2 Normative references. 6
3 Definitions. 7
4 Test equipment. 7
4.1 General. 7
4.2 Furnace. 7
4.3 Fan A. 8
4.4 Fan B. 8
4.5 Volume flow measuring station. 8
4.6 Condensing unit. 8
4.7 Damper. 8
4.8 Velocity measuring station. 8
4.9 Equipment for measuring gas pressure. 8
4.10 Thermal movement measuring device. 8
5 Test conditions. 9
6 Test specimen. 9
6.1 Size. 9
6.1.1 General. 9
6.1.2 Length. 9
6.1.3 Cross-section. 9
6.2 Number. 10
6.3 Design. 10
6.3.1 General. 10
6.3.2 Minimum separation. 10
6.3.3 Configuration of duct A (horizontal only). 10
6.3.4 Openings in duct B . 10
6.3.5 Access panel. 11
6.3.6 Joints in horizontal ducts. 11
6.3.7 Joints in vertical ducts . 11
6.3.8 Support for vertical ducts . 11
6.3.9 Compensators. 11
6.3.10 Steel ducts. 11
7 Installation of test specimen. 12
7.1 General. 12
7.2 Standard supporting construction. 12
7.3 Non-standard supporting constructions. 13
7.4 Fire stopping. 13
7.5 Unsupported vertical ducts . 13
8 Conditioning. 13
8.1 General. 13
8.2 Water-based sealing materials. 13
9 Application of instrumentation. 14
9.1 Thermocouples. 14
9.1.1 Furnace thermocouples (plate thermometers) .14
9.1.2 Unexposed surface thermocouples. 14
9.2 Pressure. 14
10 Test procedure. 15
10.1 General. 15
10.2 Control of conditions to permit assessment of integrity. 15
10.2.1 Duct A. 15
10.2.2 Duct B. 15
10.3 Test measurements and observations . 15
10.3.1 Integrity. 15
10.3.2 Insulation. 17
10.3.3 Additional observations. 17
10.4 Termination of the test . 17
11 Performance criteria. 17
11.1 Integrity. 17
11.2 Insulation. 17
11.2.1 General. 17
11.2.2 Duct with combustible lining . 17
11.3 Smoke Leakage. 18
12 Test report. 18
13 Field of direct application of test results. 18
13.1 General. 18
13.2 Vertical and horizontal ducts. 18
13.3 Sizes of ducts . 19
13.4 Pressure difference. 19
13.5 Height of vertical ducts . 19
13.5.1 Ducts supported at each storey . 19
13.5.2 Self load-bearing ducts . 19
13.5.3 Limitations on buckling. 20
13.6 Suspension devices for horizontal ducts. 20
13.7 Supporting construction. 21
13.8 Steel ducts. 21
13.9 Ducts with boards. 21
13.10 Fire stopping. 21
Annex A (informative) General guidance . 22
A.1 General. 22
A.2 Notes on apparatus. 22
A.2.1 Volume flow measuring station. 22
A.2.2 Extraction fan. 22
A.3 Notes on test specimens. 22
A.3.1 Design. 22
A.3.2 Thermal elongation and shortening. 23
A.4 Notes on test conditions . 23
A.4.1 Temperature-time development. 23
A.4.2 Anticipated pressure ranges. 23
A.5 Notes on procedure . 24
A.5.1 Air velocity in duct B . 24
A.5.2 Evaluation of duct in overpressure conditions . 24
A.5.3 Insulation and integrity. 24
A.6 Notes on performance criteria. 24

Foreword
This document (prEN 1366-1:2008) 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 1366-1:1999.
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 89/106/EEC and of the
Construction Product Directive.
EN 1366 “Fire resistance tests for service installations” consists of the following:
Part 1: Ducts
Part 2: Fire dampers
Part 3: Penetration seals
Part 4: Linear joint seals (in course of preparation)
Part 5: Service ducts and shafts (in course of preparation)
Part 6: Raised floors (in course of preparation)
Part 7: Closures for conveyors and trackbound transportation systems (in course of preparation)
Part 8: Smoke extraction ducts
Part 9: Single compartment smoke extraction ducts (in course of preparation)
Part 10: Smoke control dampers (in course of preparation)

Introduction
The purpose of this test is to measure the ability of a representative duct section or duct assembly
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 exhaust 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.
All ducts are fully restrained in all directions where they are inside the furnace. 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 test takes into account the effect of fire exposure from the outside where a 300 Pa under
pressure 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 by maintaining a velocity of 3m/s.
Ducts exposed to fire from the inside are supplied with air in a manner, which is indicative of the "fan
off", and "fan on" situations, which could arise in practice.
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 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.
1 Scope
This Part of EN 1366 is describing a method for determining the evaluation of fire resistance of
vertical and horizontal ventilation ducts including those access panels, which are integral part of the
tested ducts/duct walls. The test examines the behaviour of ducts exposed to fire from the outside
(duct A) and fire inside the duct (duct B). This 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;
b) ducts containing fire dampers at points where they pass through fire separations;
c) access panels, which are evaluated independent from the tested ducts/duct walls;
d) two or three sided ducts;
e) fixing of suspension devices to floors or walls.
For evaluation of fire dampers see EN 1366-2.
For evaluation of smoke extraction ducts see EN 1366-8.
For evaluation of service ducts and shafts see prEN 1366-5.
2 Normative references
This European Standard incorporates by dated or undated reference, provisions from other
publications. These normative references are cited at the appropriate places in the text and the
publications are listed hereafter. For dated references, subsequent amendments to or revisions of any
of these publications apply to this European Standard only when incorporated in it by amendment or
revision. For undated references the latest edition of the publication referred to applies.
EN 520, Gypsum plasterboards — Specification — Test method (ISO 6308:1980 modified)
EN 12237, Ventilation for buildings — Ductwork — Strength and leakage of circular sheet metal ducts
EN 1363-1, Fire resistance tests — Part 1: General requirements
EN 1366-2, Fire resistance tests for service installations — Part 2: Dampers
prEN 1366-5, Fire resistance tests for service installations — Part 5: Service ducts and shafts
EN 1366-8, Fire resistance tests for service installations — Part 8: Smoke extraction ducts
EN 1507, Ventilation for buildings — Ductwork — Rectangular sheet metal air ducts — Strength and
leakage — Requirements and testing
prEN ISO 13943, Fire safety — Vocabulary (ISO/DIS 13943:1998)
EN 20898-1, Mechanical Properties of fasteners — Part 1: Bolts, screws and studs (ISO 898:1980)
EN ISO 5167-1, Measurement of fluid flow by means of pressure differential devices — Part 1: Orifice
plates, nozzles and venturi tubes inserted in circular cross-section conduits (ISO 5167-1:1991)
ISO 5221, Air distribution and air diffusion — Rules to methods of measuring air flow rate in an air-
handling duct
3 Definitions
For the purposes of this Part of EN 1366, the definitions given in EN 1363-1 and prEN ISO 13943,
together with the following, apply:
3.1
fire-resistant duct section
a duct used for the distribution or extraction of air and designed to provide a degree of fire resistance
3.2
combustible lining
a lining on the inner surface of the duct with a maximum thickness of 0,5 mm
3.3
self-supporting duct
a duct constructed e.g. from fire-protective boards without using a steel duct
3.4
suspension devices
the components used for suspending and fixing a duct from a floor or supporting a duct from a wall
3.5
supporting construction
the wall, partition or floor which the duct passes through in the test
3.6
compensator
a device that is used to prevent damage from the forces generated by expansion
3.7
access panel
a closure of an inspection opening within the duct
3.8
fire protected steel duct
steel duct with an external insulation to provide insulation in case of fire
4 Test equipment
4.1 General
In addition to the test equipment specified in EN 1363-1, and if applicable EN 1363-2, 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 A
This shall be able to produce at the start and throughout the test an under pressure of (300 ± 15) Pa
within duct A (see Figure 3) and shall be connected either directly, or by a suitable length of flexible
ducting, to the measuring station described in 4.5.
NOTE If used as a smoke duct, the duct shall be tested in accordance with EN 1366-8.
4.4 Fan B
This shall be able to produce an air velocity when extracting gas from duct B (see Figure 5), of at least
3 m/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 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 and ISO 5221. It shall be
connected to the end of duct A outside the furnace 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
drainage. The gas temperature adjacent to the flow-measuring device shall be measured by a 2 mm
sheathed thermocouple with an insulated hot junction, arranged pointing downwards to allow for
draining moisture. Its measuring junction shall be located at the centre line of the measuring duct and
at a distance equal to twice the diameter of the measuring duct 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 velocity measuring station to shut off the airflow in duct
B during evaluation of integrity in the "fan-off" condition.
4.8 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 and ISO 5221, connected
to the end of both the vertical and horizontal duct B outside the furnace.
4.9 Equipment for measuring gas pressure
This shall be provided in the furnace and inside duct A.
4.10 Thermal movement measuring device
This shall be provided for measuring expansion/contraction of duct A and shall have an accuracy of
± 1 mm.
NOTE Measurements at penetration point (knowing that elongation outside the furnace will not be taken into
account).
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 ± 3) Pa throughout the test at the mid-height position
of the horizontal ducts. For vertical ducts the furnace pressure shall be controlled to (20 ± 3)
Pa 100 mm below the ceiling.
For horizontal ducts, duct A and B superposed. The furnace pressure shall be controlled to (15 ± 3)
Pa at the mid-height position of duct B (lower duct).
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
Ducts of sizes other than those given in Tables 1 and 2 have restricted the direct field of application
(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 — Cross-section of test specimen (dimension of the open cross-section
Duct Rectangular Circular
Width (mm) Height (mm) Diameter (mm)
A
1000 ± 10 500 ± 10 800 ± 10
B
1000 ± 10 250 ± 10 630 ± 10
6.2 Number
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 edge conditions and the method of fixing or support inside and outside
the furnace shall be representative of that used in practice.
Ducts shall be arranged as shown in Figures 1, 2, 3, 3.1 and 3.2.
6.3.2 Minimum separation
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
and 2 and 3.
There shall be a separation of (500 ± 50) mm between the top of a horizontal duct and the ceiling. A
minimum separation of (500 ± 50) mm shall be provided between the underside of a horizontal duct
and the floor. Similarly, there shall be a minimum separation of at least (500 ± 50) mm between the
sides of ducts and furnace walls.
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 × 250 mm (Ø 250 mm), and shall be arranged as
shown in Figure 2, 3.1 and 3.2. All specimens including this branch shall be mounted with the
suspension or fixing devices as used in practice.
6.3.4 Openings in duct B
Two openings as in practice 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 furnace wall.
For vertical ducts the openings shall be positioned (200 ± 10) mm below the furnace roof (see
Figures 3 and 4).
In both vertical and horizontal ducts, clear openings area shall be 50 % ± 10 % of the cross sectional
area of the duct.
6.3.5 Access panel
If a door for an inspection opening is to be tested in a horizontal duct it shall be mounted in the 1.
straight duct piece after the T-piece resp. after the wall penetration (see Figures 1 to 3).
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, 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 at
mid-span 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
These shall be supported on the furnace floor and penetrate through the furnace roof slab/supporting
construction (see Figure 1); the ducts shall be fixed at the furnace roof level as they would be fixed in
practice when penetrating a floor. This shall be as specified by the sponsor.
6.3.9 Compensators
Only where compensators are used in practice shall they be incorporated in the test specimen. Where
a compensator is to be tested it shall be located within the furnace for duct A, and for duct B outside
the furnace approximately 500 mm from the wall or floor.
6.3.10 Steel ducts
Where steel ducts are used, these shall have class A leakage in accordance with prEN 1507.
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 of the type to be used in
practice and shall have a fire resistance greater than the required 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.
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 to 5 shall be used.
Table 3 — Standard rigid wall constructions
Type of Thickness Density Test duration t
construction mm kg/m h
110 ± 10 2200 ± 200 t ≤ 2
Normal concrete/
150 ± 10 2200 ± 200 2 < t ≤ 3
masonry
175 ± 10 2200 ± 200 3 < t ≤ 4
1)
Aerated concrete
110 ± 10 650 ± 200 t ≤ 2
150 ± 10 650 ± 200 2 < t ≤ 4
1)
This supporting construction may be made from blocks, bonded together with mortar or adhesive.

Table 4 — Standard flexible wall constructions (gypsum plasterboard type F to EN 520)
Fire resistance Wall constructions
(minutes)
Number of layers Thickness Insulation Thickness (mm)
on each side (mm)
D/ρρρρ ±±±± 10 %
30 1 12,5 40/40 75
60 2 12,5 40/40 100
90 2 12,5 60/50 125
120 2 12,5 60/100 150
180 3 12,5 60/100 175
240 3 15 80/100 190
D is the thickness in mm of mineral wool insulation inside the wall
ρ is the density in kg/m³ of mineral wool insulation inside the wall

Table 5 — Standard floor constructions
Type of Thickness Density Test duration t
construction mm kg/m h
110 ± 10 2200 ± 200 t ≤ 1,5
Normal concrete
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
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 accommodate as
used in practice.
7.5 Unsupported vertical ducts
Where, in practice, vertical ducts are not fixed to each floor, then the test specimen shall be suitably
loaded to simulate the weight of the remaining height of unsupported ducting.
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 used to seal the gap between the supporting construction and the duct where
the gap is ≤ 25 mm wide shall be conditioned for 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 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 6 and 7.
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 at the point of penetration of the duct through the wall or
floor is shown in Figures 8 to 11 for a number of different penetration details. At least one
thermocouple of each type shall be positioned on each side of a rectangular duct.
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 all joints (inner layer joints also).
9.1.2.3 Ducts with combustible linings
Where ducts with 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.
9.2 Pressure
Furnace pressure shall be measured in accordance with chapter 5.
10 Test procedure
10.1 General
Before the test the leakage of the laboratory measuring and condensing system shall be made, 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 and,
if applicable, EN 1363-2.
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 below the laboratory pressure
at the beginning of the test and maintain it at this value throughout the test.
NOTE If used as a smoke duct, see 4.3.
10.2.2 Duct B
Prior to the start of the test stabilise the air velocity in duct B (see Figure 5) to 3 m/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. 11) should be used for the calculation.
25 minutes after the start of the test, 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 6 summarises the evaluation
required to assess integrity.
Table 6 — 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
Cotton Pad
Duct B -------- Openings
(Fire inside duct) Flaming
10.3.1.2 For duct A only:
Record the pressure differential across the venturi, orifice plate, etc. at not more than two-minute
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 and ISO 5221. 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 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 a duct in its intended position
or when sections of the duct collapse.
d) the expansion/contraction of each layer of protection material on the duct, at the end of horizontal
duct A.
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 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 ,
2 1
T , T , and the roving thermocouple shall be used to dete
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