Extended application of results from fire resistance tests for service installations - Part 1: Ducts

This European Standard identifies parameters that affect the fire resistance of ducts for ventilation purposes. It also identifies the factors that need to be considered when deciding whether, or by how much a parameter can be extended either positively or negatively when contemplating the fire resistance on an untested variation in the construction.
This European Standard, where applicable, gives guidance on additional tests that are needed to extend the field of application.
The European Standard gives the principles behind how a conclusion on the influence of specific parameters/constructional details relating to the relevant criteria (E, I, S) can be achieved.
This European Standard only applies to ducts tested to EN 1366 1. Duct sections for use other than in fire resisting heating, ventilation and air conditioning (HVAC) systems are not covered by this European Standard. It does not cover ducts used for smoke control which are tested in accordance with EN 1366 8 or EN 1366 9.

Erweiterter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprüfungen für Installationen - Teil 1: Leitungen

Diese Europäische Norm benennt Parameter, die die Feuerwiderstandsfähigkeit von Lüftungsleitungen beeinflussen. Sie benennt auch die Faktoren, die bei der Entscheidung berücksichtigt werden müssen, ob und in welchem Ausmaß ein Parameter entweder in positiver oder negativer Richtung erweitert werden kann, wenn die Feuerwiderstandsfähigkeit an einer ungeprüften Abweichung in der Konstruktion betrachtet wird.
Diese Europäische Norm gibt, soweit zutreffend, eine Anleitung für zusätzliche Prüfungen, die erforderlich sind, um den Anwendungsbereich zu erweitern.
Die Europäische Norm liefert die Grundsätze, nach denen eine Schlussfolgerung über den Einfluss von bestimmten Parametern/Konstruktionsdetails, welche die entsprechenden Kriterien (E, I, S) betreffen, erreicht werden kann.
Diese Europäische Norm gilt nur für Leitungen, die bereits nach EN 1366 1 geprüft wurden. Leitungsabschnitte, die zu anderen Zwecken als in feuerwiderstandsfähigen Heizungs-, Belüftungs- und Klimaanlagen verwendet werden, sind nicht Gegenstand dieser Europäischen Norm. Diese Europäische Norm gilt auch nicht für Leitungen, die der Entrauchung dienen und nach EN 1366 8 oder EN 1366 9 geprüft wurden.

Application étendue des résultats des essais de résistance au feu des installations de service - Partie 1: Conduits

Razširjena uporaba rezultatov preskusov požarne odpornosti servisnih inštalacij - 1. del: Požarni kanali

Ta evropski standard določa parametre, ki vplivajo na požarno odpornost ventilacijskih kanalov. Določa tudi dejavnike, ki jih je treba upoštevati pri odločanju, ali je pri obravnavi požarne odpornosti nepreskušene različice stavbe mogoče razširiti ali zožiti parameter in za koliko.
Ta evropski standard vsebuje navodila o dodatnih preskusih, ki jih je treba izvesti za razširitev področja uporabe.
Ta evropski standard določa načela o tem, kako je mogoče doseči sklep o vplivu določenih parametrov/konstrukcijskih lastnosti v zvezi z zadevnimi merili (E, I, S).
Ta evropski standard se uporablja za kanale, preskušene v skladu s standardom EN 1366-1. Kanali, ki se ne uporabljajo za sisteme ogrevanja, hlajenja, prezračevanja in klimatizacije (HVAC), niso zajeti v ta evropski standard. Standard ne zajema kanalov, ki se uporabljajo za nadzor dima in so preskušeni v skladu s standardom EN 1366-8 ali EN 1366-9.

General Information

Status
Published
Publication Date
07-Nov-2017
Current Stage
6060 - Definitive text made available (DAV) - Publishing
Due Date
08-Nov-2017
Completion Date
08-Nov-2017

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Razširjena uporaba rezultatov preskusov požarne odpornosti servisnih inštalacij - 1. del: Požarni kanaliErweiterter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprüfungen für Installationen - Teil 1: LeitungenApplication étendue des résultats des essais de résistance au feu des installations de service - Partie 1: ConduitsExtended application of results from fire resistance tests for service installations - Part 1: Ducts91.060.40Dimniki, jaški, kanaliChimneys, shafts, ducts13.220.50Požarna odpornost gradbenih materialov in elementovFire-resistance of building materials and elementsICS:Ta slovenski standard je istoveten z:EN 15882-1:2011+A1:2017SIST EN 15882-1:2012+A1:2018en,fr,de01-januar-2018SIST EN 15882-1:2012+A1:2018SLOVENSKI

STANDARDSIST EN 15882-1:20121DGRPHãþD
SIST EN 15882-1:2012+A1:2018
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15882-1:2011+A1
November
t r s y ICS
s uä t t rä w râ
{ sä s v rä u r Supersedes EN
s w z z tæ sã t r s sEnglish Version

Extended application of results from fire resistance tests for service installations æ Part

sã Ducts Application étendue des résultats des essais de résistance au feu des installations de service æ Partie

sã Conduits

Erweiterter Anwendungsbereich der Ergebnisse aus Feuerwiderstandsprüfungen für Installationen æ Teil

sã Leitungen This European Standard was approved by CEN on
t t October
t r s s and includes Amendment
s approved by CEN on
s s September
t r s yä

egulations which stipulate the conditions for giving this European Standard the status of a national standard without any alterationä Upætoædate lists and bibliographical references concerning such national standards may be obtained on application to the CENæCENELEC Management Centre or to any CEN memberä

translation under the responsibility of a CEN member into its own language and notified to the CENæCENELEC Management Centre has the same status as the official versionsä

CEN members are the national standards bodies of Austriaá Belgiumá Bulgariaá Croatiaá Cyprusá Czech Republicá Denmarká Estoniaá Finlandá Former Yugoslav Republic of Macedoniaá Franceá Germanyá Greeceá Hungaryá Icelandá Irelandá Italyá Latviaá Lithuaniaá Luxembourgá Maltaá Netherlandsá Norwayá Polandá Portugalá Romaniaá Serbiaá Slovakiaá Sloveniaá Spainá Swedená Switzerlandá Turkey and United Kingdomä

EUROPEAN COMMITTEE FOR STANDARDIZATION COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG

CEN-CENELEC Management Centre:
Avenue Marnix 17,
B-1000 Brussels

t r s y CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Membersä Refä Noä EN

s w z z tæ sã t r s s ªA sã t r s y ESIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 2 Contents Page European foreword ....................................................................................................................................................... 3 Introduction .................................................................................................................................................................... 4 1 Scope .................................................................................................................................................................... 5 2 Normative references .................................................................................................................................... 5 3 Terms and definitions ................................................................................................................................... 5 4 Critical parameters and factors ................................................................................................................. 6 4.1 General ................................................................................................................................................................ 6 4.2 Common thermal and mechanical parameters and factors............................................................. 6 4.3 Common constructional parameters and factors ................................................................................ 7 4.4 Specific constructional parameters and factors .................................................................................. 8 5 Methodology ..................................................................................................................................................... 9 6 Requirements, performance criteria and influences ...................................................................... 15 6.1 Requirements and performance criteria............................................................................................. 15 6.2 Influences ........................................................................................................................................................ 15 7 Assessment scheme ..................................................................................................................................... 16 7.1 General ............................................................................................................................................................. 16 7.2 Requirement for additional tests ........................................................................................................... 16 8 Test arrangements and criteria for additional tests ....................................................................... 16 8.1 Maximum dimensions of ducts which can be classified ................................................................. 16 8.2 Closed ducts with pressure differential ............................................................................................... 17 8.3 Open horizontal duct B............................................................................................................................... 17 8.4 Open vertical duct B .................................................................................................................................... 17 8.5 Additional rules ............................................................................................................................................ 17 9 Evaluation of fire resistance ..................................................................................................................... 21 9.1 Application of the basic and additional test results ........................................................................ 21 9.2 Suspension devices ...................................................................................................................................... 21 9.3 Inspection openings/access panels ....................................................................................................... 22 9.4 Components within ducts .......................................................................................................................... 23 9.5 Surface finishes ............................................................................................................................................. 23 9.6 Change in wall or floor thickness ........................................................................................................... 23 10 Extended application report .................................................................................................................... 23 Bibliography ................................................................................................................................................................. 29

SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 3 European foreword This document (EN 15882-1:2011+A1:2017) has been prepared by Technical Committee CEN/TC 127 “Fire safety in buildings”, the secretariat of which is held by BSI. This document includes Amendment 1 approved by CEN on 1 May 2017. This document supersedes !EN 15882-1:2011". The start and finish of text introduced or altered by amendment is indicated in the text by tags !". 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 May 2018, and conflicting national standards shall be withdrawn at the latest by May 2018. Attention is drawn to the possibility that some of the elements of this document may be the subject of patent rights. CEN [and/or CENELEC] shall not be held responsible for identifying any or all such patent rights. This document has been prepared under a mandate given to CEN by the European Commission and the European Free Trade Association. This European Standard has the general title Extended application of results from fire resistance tests for service installations and consists of the following parts: - Part 1: Ducts; - Part 2: Dampers; - Part 3: Penetration seals; - Part 4: Linear joint seals. The Enquiry phase of this project (00127162) took place under the reference prEN 15080-10. According to the CEN-CENELEC Internal Regulations, the national standards organizations of the following countries are bound to implement this European Standard: 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 the United Kingdom. SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 4 Introduction There are a number of practical limitations on the size and design of elements that can be tested by the standard methods of fire resistance test. When these elements are larger, or are of a modified design, there is a necessity to be able to confirm their performance, i.e. whether the classification(s) is (are) given in the classification report in relation to the relevant criteria identified in the Interpretative Document are maintained, without the ability of being able to test them. To achieve this, extended application documents for the various elements are under development. It is not allowed to change any detail of the duct construction. If this is done outside the DiAP1) and EXAP2), the duct has another design and cannot be classified in accordance with EN 13501-3 without further appropriate testing. Before there can be any consideration for extended application the duct shall be tested in accordance with EN 1366-1 to achieve a test result which could generate a classification in accordance with EN 13501-3 at least equal to the classification subsequently required from extended application considerations. The extended application report should be based on the evaluation of one or more fire resistance test reports on the same proprietary construction of duct. A review of the duct construction parameters may indicate that one or more criteria (integrity, insulation, leakage) may be improved by a particular parameter variation. In the case of ducts, this should never lead to an increased classification period for any specific parameter beyond that achieved during any one test.

1) DiAP = Direct field of application. 2) EXAP = Extended field of application. SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 5 1 Scope This European Standard identifies parameters that affect the fire resistance of ducts for ventilation purposes. It also identifies the factors that need to be considered when deciding whether, or by how much a parameter can be extended either positively or negatively when contemplating the fire resistance on an untested variation in the construction. This European Standard, where applicable, gives guidance on additional tests that are needed to extend the field of application. The European Standard gives the principles behind how a conclusion on the influence of specific parameters/constructional details relating to the relevant criteria (E, I, S) can be achieved. This European Standard only applies to ducts tested to EN 1366-1. Duct sections for use other than in fire resisting heating, ventilation and air conditioning (HVAC) systems are not covered by this European Standard. It does not cover ducts used for smoke control which are tested in accordance with EN 1366-8 or EN 1366-9. 2 Normative references The following referenced documents are indispensable for the application of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies. EN 1363-1!:2012", Fire resistance tests — Part 1: General requirements EN 1366-1:1999, Fire resistance tests for service installations — Part 1: Ducts EN 13501-3, Fire classification of construction products and building elements — Part 3: Classification using data from fire resistance tests on products and elements used in building service installations: Fire resisting ducts and fire dampers EN ISO 898-1, Mechanical properties of fasteners made of carbon steel and alloy steel — Part 1: Bolts, screws and studs with specific property classes — Coarse thread and fine pitch thread (ISO 898-1:2009) 3 Terms and definitions For the purposes of this document, the terms and definitions given in EN 1363-1 and EN 1366-1 and the following apply. 3.1 self-supporting duct duct constructed from fire protective boards to provide fire resistance without using a conventional steel duct 3.2 fire protected steel duct steel duct with or without external insulation or coating to provide integrity or integrity and insulation in case of fire 3.3 duct system complete system, consisting of the duct sections, duct joints, suspensions and penetration seals SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 6 3.4 duct section element of a fire resisting duct constructed to form part of a duct system which has to be fire resistant 3.5 structural supports means of retaining the fire resisting duct section to the building structure !3.6 duct system with one variable parameter duct system where all essential components are the same, with the exception of one parameter in one component (e.g. density of the insulation, thickness of insulation) Note 1 to entry: By changing the variable parameter, the individual duct system gets different classification times" 4 Critical parameters and factors 4.1 General The following parameters and factors are considered to affect the fire resistance performance of a duct system and shall be taken into account when determining the field of extended application. The parameters vary depending upon the nature of the element to be considered. The parameters for the common, identifiable forms of duct construction are given in 4.2, 4.3 and 4.4. 4.2 Common thermal and mechanical parameters and factors Table 1 — Factors relating to thermal and mechanical parameters Line Parameter and rule reference Factor a Fire exposure Outside or inside b Changes in pressure (positive or negative) Lower or higher c Change in wall/floor type or thickness Rigid or flexible constructions Greater or lower thickness d Forces at wall/floor penetrations Value of force higher or lower SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 7 4.3 Common constructional parameters and factors Table 2 — Factors relating to Common constructional parameters Line Parameter and rule reference Factor a Orientation Vertical, horizontal or sloping b Change in shape Rectangular to circular or oval c Change in height of cross-section Greater or less than tested d Change in width of cross-section Greater or less than tested e Change in diameter of cross-section Greater or less than tested f Protection material Change of material SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 8 4.4 Specific constructional parameters and factors Table 3 — Factors relating to Specific constructional parameters Line Parameter and rule reference Factor a Thickness of protection Greater or less than tested b Distance between joints/stiffeners Greater or less than tested c Number of protective layers Greater or less than tested d Change in penetration sealing system around duct Dependant on test data available e Expansion provision Greater or less than tested f Presence of combustible materials within duct Yes or no g Length of vertical ducts between supports Greater or less than tested h Distance and arrangements between the joints of various layers Greater or less than tested, different arrangement i Self-weight of duct Effect on hangers/supports j Length of horizontal duct between supports/hangers Greater or less than tested k Effect of supports on vertical ducts Bending moment, section modulus l Length of duct between flanges/spigots Greater or less than tested m Change of structure of steel ducts (e.g. type of steel, gauge, … etc.) Yes or no n Effect of access panels Yes or no Size of access panels Access panels protected? o Hanger protection and arrangement Greater or less than tested, different arrangement p Hangers Length Tensile stress Position relative to any duct joint q Bearers Bending stress Shear stress Section modulus r Anchors Type of anchor, chemical or mechanical strength Penetration depth s Compensators Yes or no t Components integrated within the duct (fan cases, silencers etc.) Yes or no u Shape of joints in protection boards or insulation Mitred, butted or rebate edge v Fixing and jointing details Yes or no SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 9 5 Methodology When preparing an extended application for a construction product, the parameters listed in Clause 4 relating to ducts shall be considered in turn and their relevance shall be identified. This can normally be achieved in a tabular manner with using “yes” to identify those parameters that are relevant, and “no” to identify those that are not. For each relevant parameter the appropriate factors from those given in Clause 4 shall be analysed to establish their influence (positive or negative) on the fire resistance of the duct. In this case, the influence shall be established for integrity and insulation in turn and where appropriate smoke leakage. The analysis shall take the form of considering influence of the proposed variation against: a) The application of the requirements in this European Standard; b) The use of calculations and rules defined in EN 1366-1 or in EN 15882-1. For each factor this analysis shall be transparent and the report shall include the justification. SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 10 Table 4 — Factor influence on criteria Parameter Factors Factor influence on criteria Integrity (E) Insulation (I) Smoke leakage (S) Rules Orientation Vertical or horizontal See rule See rule See rule Covered by EN 1366-1, shall test in appropriate orientation Fire exposure Outside or fire inside See rule See rule See rule Covered by EN 1366-1, shall test for both situations Presence of combustible materials within duct (inside) See rule See rule See rule See rule Combustible materials can be used provided they have been included in the test specimen. Combustible materials in the test specimen can be omitted in practice. Changes in negative pressure Increased under-pressure greater than 300 Pa Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see !8.2" Decreased under-pressure OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained Positive pressure Greater than 300 Pa (500 Pa, if in DIAP of EN 1366-1) Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see !8.2" Change in shape (e.g. rectangular to circular) See rule See rule See rule See rule Additional test necessary, see EN 1366-1 Pieces of duct for change of directions or cross sections of for separation of airstreams See rule OK [ = /+E] OK [ = /+I] OK [ = /+S] These pieces of duct are covered by the test according to EN 1366-1 provided the same materials, thickness are used and the same technique of jointing Height of cross-section Increase height Worse [-E] Worse [-I] Worse [-S] Additional test data needed, guidance given in Figure 1 to Figure 4 Decrease height OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained Width of cross-section Increase width Worse [-E] Worse [-I] Worse [-S] Additional test data needed, guidance given in Figure 1 to Figure 4 Decrease width OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained, if the maximum distance in width between duct wall and stiffeners as well as between two stiffeners shall not exceed the tested distance. Thickness of protection Increase thickness OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained unless the thickness is increased for not more than 20 %, subject to checking that supports will take additional weight Decrease thickness Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 11 Length of duct between flanges/spigot Increase length Worse [-E] Worse [-I] Worse [-S] Additional test necessary, with maximum length, see EN 1366-1 Decrease length OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained Distance between board joints Increase distance Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 Decrease distance OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained Table 4 — Factor influence on criteria (continued) Parameter Factors Factor Influence On Criteria Integrity (E) Insulation (I) Smoke Leakage (S) Rules Change in wall/floor type or thickness increased thickness OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained, see 13.7 of EN 1366-1:1999 decreased thickness Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 change in wall/floor type see rule See 13.7 of EN 1366-1:1999 change in diameter of cross-section (for circular ducts) increased diameter Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 decreased diameter OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained, see 13.3 of EN 1366-1:1999 protection material change of material see rule New tests necessary, change of material (chemical composition, density etc.) leads to a different duct system Distance between stiffeners increased distance Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 decreased distance OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained number of protective layers increased number OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained decreased number Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 change in penetration sealing system around duct increased thickness of protective material of the penetration sealing (e.g. strips on the wall/floor surface) OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained decreased thickness of protective material of the penetration sealing (e.g. strips on the wall/floor surface) Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 increased gap width around the duct Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 decreased gap width around the duct OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 12 different arrangement and/or orientation of strips or other material at the penetration sealing see rule Additional test necessary; changes on the penetration sealing system lead to a different duct systems effect of access panels presence of access panels yes/no see rule access panel needs to be tested in basic tests according EN 1366-1 increased size of access panels Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 decreased size of access panels OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained hangers length see rule See 13.6 of EN 1366-1:1999 tensile stress see rule See 9.2 position relative to any duct joint see rule See 13.6 of EN 1366-1:1999; furthermore, the following rule applies: If at least one suspension device has been placed beside a joint inside the furnace for at least on test specimen, the suspensions can be used in practise with suspensions beside the joint. In this case, the maximum tested distance between joint and suspension device shall not be exceeded in practise bearers bending stress, shear stress, section modulus see rule See 9.2 anchors type of anchor, chemical or mechanical strength, penetration depth see rule See 9.2 Table 4 — Factor influence on criteria (continued) Parameter Factors Factor Influence On Criteria Integrity (E) Insulation (I) Smoke Leakage (S) Rules Self-weight of duct Increased weight Worse [-E] Worse [-I] Worse [-S] Increase number of hangers/support Calculated on the basis of EN 1366-1:1999, 13.6 as tested. The value obtained in the test report is basis for increasing the number of hangers/supports Decreased weight OK [ = /+E] OK [ = /+I] OK [ = /+S] Number of hangers/supports as tested, see test report and EN 1366-1:1999, 13.6 Hanger protection Increase protection OK [ = /+E] OK [ = /+I] OK [ = /+S] See EN 1366-1:1999, 13.6 Decreased protection Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1 SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 13 Length of vertical ducts between supports Increase distance Worse [-E] Worse [-I] Worse [-S] Should test with maximum support spacing, see EN 1366-1 Maximum duct size

Width = 1250 mm Height = 1000 mm Decrease distance OK [ = /+E] OK [ = /+I] OK [ = /+S]

Effect of supports on vertical ducts, Increase bending moment Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1:1999, 13.5 Decrease bending moment OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained, see EN 1366-1:1999, 13.5 Increase section modulus OK [ = /+E] OK [ = /+I] OK [ = /+S] Assume that classification will be maintained, see EN 1366-1:1999, 13.5.3 Decrease section modulus Worse [-E] Worse [-I] Worse [-S] Additional test necessary, see EN 1366-1:1999, 13.5.3 Steel duct properties Galvanized steel to stainless steel See rules See rules See rules Additional test necessary Stainless steel to galvanized steel See rules See rules See rules Additional test necessary Flange to spigot Worse [-E] Worse [-I] Worse [-S] Additional test necessary Spigot to flange OK [ = /+E] OK (=/+I) OK (=/+S) Assume that classification will be maintained. Table 4 — Factor influence on criteria (concluded) Parameter Factors Factor Influence On Criteria Integrity (E) Insulation (I) Smoke Leakage (S) Rules Mechanical fixings Use of screws (same or greater length) instead of staples See rule See rule See rule Assume that classification will be maintained Use of staples instead of screws See rule See rule See rule Additional test Inclined / sloping ducts a > 10° from horizontal axis See rule See rule

See rule

Allowed provided that both vertical and horizontal tests acc EN 1366-1 have been successfully performed on the same protection system and that the length of the inclined part of the duct is less than the distance between the suspension devices in the horizontal test. Penetration through walls and floors are not covered.

a < 10° See rule See rule See rule Covered by horizontal test SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 14 Corner details

Change from «upper/lower board on top vertical boards» to «upper/lower board between vertical boards» OK (=/+ E) OK (=/+ I) OK (=/+ S) The windmill test arrangement in figure c) is representative for the other two board combinations (see figures a) and b) on the left), but the test of a single combination does not cover the other combination (e.g. a) does not cover the combination b)

Change from «upper/lower board between vertical boards» to «upper/lower board on top vertical boards» Worse (-E) Worse (-I) Worse (-S) NOTE If more than one variation of the construction parameters are included in the test according to this standard and if the results (time to satisfy the criteria) are lower than those of the basic test according to EN 1366-1, these lower test results shall be taken as basis for the classification of the duct with any one of the variations.

SIST EN 15882-1:2012+A1:2018

EN 15882-1:2011+A1:2017 (E) 15 6 Requirements, performance criteria and influences 6.1 Requirements and performance criteria Ducts shall be able to withstand all the pressure differentials at all working conditions within the designed system. For the assessment of fire resistance with extended applications of ducts the following criteria: a) insulation (see EN 1366-1); b) integrity (see EN 1366-1); c) leakage (see EN 1366-1) shall be taken into account as they are described in EN 1366-1 and in this European Standard. 6.2 Influences 6.2.1 Insulation The insulating effect of building materials for ducts with a requirement to the fire resistance is not in linear proportion to their thickness. The rules of linear stationary heat transmission are not applicable. 6.2.2 Integrity and leakage a) Integrity of duct system The integrity of duct construction, especially the leakage, may be adversely affected due to splitting and cracking and is lost with an increasing number, width and length of gaps and cracks. The formation of gaps and cracks in horizontal ducts could be introduced by: 1) displacement of ducts due to long and unprotected hangers, in addition the stability of horizontal ducts is significantly depe

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