Multi firing Sauna stoves fired by solid fuel - Requirements and test methods

This European Standard covers multi-firing sauna stoves in which the heating stones are separated from and indirectly heated by the fire and the flue gases and which may be re-fuelled with several fuel loads. This European Standard specifies requirements relating to the design, manufacture, construction, safety and performance (efficiency and emission) of multi-firing sauna stoves fired by wood logs and provides instructions for them. Furthermore, it also gives provisions for evaluation of conformity (i.e. initial type testing (ITT) and factory production control (FPC) and marking of these products. This standard is applicable to hand-fuelled intermittent burning multi-firing sauna stoves, which provide heat into the space where they are installed. These multi-firing sauna stoves may be supplied either as an assembled appliance or as a manufacturer’s predesigned unit consisting of pre-fabricated components designed to be built on site in accordance with the manufacturer’s specified assembly instructions. One-off installations are not included. These multi-firing sauna stoves may burn only natural wood logs in accordance with the appliance operating instructions. Single-firing heat storage sauna stoves, in which the stones are directly heated by the fire and the flue gases, which pass through them, are not covered by this European Standard. This standard is also not applicable to mechanically fed sauna stoves, sauna stoves having fan assisted combustion air, sauna stoves fitted with a boiler, sauna stoves with incorporated flue or sauna stoves having any electrical connection.

Mehrfach befeuerbare Saunaöfen zur Verfeuerung fester Brennstoffe - Anforderungen und Prüfverfahren

Diese Europäische Norm beinhaltet mehrfach befeuerbare Saunaöfen, in denen die Steine separat vom Feuer und dem Abgas beheizt werden und bei denen auch mehrmals Brennstoff nachgelegt werden kann.
Diese Europäische Norm beschreibt Anforderungen an Auslegung, Herstellung, Konstruktion, Sicherheit und der Leistungsvermögen (Wirkungsgrad und Emission), Anleitung und Kennzeichnung mit dem dazugehörigem Prüfverfahren und Prüfbrennstoff für die Typprüfung des mehrfach befeuerbaren Sauna Ofen zur Verfeuerung fester Brennstoffe.
Diese Norm ist anwendbar für handbeschickte Dauerbrand- oder Zeitbrandfeuerstätten, die dazu bestimmt sind den Aufstellungsraum zu beheizen indem sie aufgestellt sind.
Diese Saunaöfen können sowohl als vormontierte Feuerstätten als auch vom Hersteller vorgefertigte Feuerstätten, die aus vorproduzierten Komponenten bestehen, und die vor Ort gemäß der vom Hersteller mitgelieferten Einbauanleitung aufgestellt werden. Handwerklich gefertigte Installationen sind nicht enthalten.
Diese Geräte können ausschließlich naturbelassene Holzscheite gemäß der Herstelleranleitung verbrennen.
Einfach befeuerbare Speichersaunaöfen, in denen die Steine direkt durch das Feuer und die Abgase einer einmaligen Brennstoffbefüllung beheizt werden, werden in dieser Norm nicht berücksichtigt.
Diese Norm ist auch nicht anwendbar für mechanisch beschickte Feuerstätten, Feuerstätten mit Verbrennungsluftgebläse oder Feuerstätten mit wasserführenden Bauteilen.

Poêles de sauna à allumage multiple à combustible solide - Exigences et méthodes d'essai

La présente Norme européenne s’applique aux poêles de sauna à allumage multiple dans lesquels les pierres sont isolées des flammes et des fumées par lesquelles elles sont indirectement chauffées, et qui sont susceptibles d’être rechargés avec plusieurs charges de combustible.
La présente Norme européenne spécifie les exigences relatives aux instructions de conception, fabrication, construction, sécurité et performance (rendement et émission) et au marquage, ainsi que les méthodes et combustibles d’essai correspondants pour les essais de type des poêles de sauna à allumage multiple à combustible solide.
La présente norme s’applique aux appareils à combustion constante ou intermittente alimentés manuellement. Ces appareils produisent de la chaleur dans la pièce où ils sont installés et s’inscrivent dans le domaine d’application du mandat M 129.
Ces poêles de sauna peuvent être fournis sous forme d’appareil assemblé ou d’une unité conçue au préalable par le fabricant, constituée d’éléments préfabriqués, destinés à être montés sur le site conformément aux instructions d’assemblage spécifiées par le fabricant. Les installations uniques ne sont pas incluses
Ces appareils peuvent fonctionner avec des bûches de bois naturelles ou manufacturées conformément aux instructions du fabricant de l’appareil.
Les saunas de stockage à allumage unique dans lesquels les pierres sont directement chauffées par les flammes et les fumées provenant d’une seule charge de combustible ne sont pas pris en compte par la présente norme. La présente norme ne s’applique pas non plus aux appareils à alimentation mécanique, aux appareils dont l’air de combustion est alimenté par un ventilateur ni aux appareils avec bouilleur.

Peči za savno na trdno gorivo - Zahteve in preskusne metode

Ta evropski standard zajema peči za savno, v katerih so grelni kamni ločeni od ognja in dimnih plinov ter se z njimi grejejo posredno, in katere se lahko dopolnijo z gorivom z več polnjenji. Ta evropski standard določa zahteve, povezane z načrtovanjem, proizvajanjem, gradnjo, varnostjo in zmogljivostjo (učinkovitost in oddajanje) peči za savno, ki se kurijo s poleni, in podaja navodila zanje. Poleg tega, podaja določbe za ugotavljanje skladnosti (tj. začetno tipsko preskušanje (ITT) in kontrola proizvodnje (FPC)) ter označevanje teh izdelkov). Ta standard velja za ročno polnjene peči za savno, ki gorijo v presledkih in ki oskrbujejo prostor, v katerega so nameščene, s toploto. Te peči za savno so dobavljive bodisi kot montirana naprava bodisi kot vnaprej oblikovana enota proizvajalca, ki je sestavljena iz vnaprej izdelanih komponent, načrtovanih za gradnjo na kraju samem, v skladu z navedenimi proizvajalčevimi navodili za montažo. Enkratne inštalacije niso vključene. Te peči za savno lahko gorijo le na naravna polena v skladu z navodili za delovanje naprave. Peči za savno, v katerih kamne grejejo neposredno ogenj in dimni plini, ki potujejo skoznje, niso zajete v tem evropskem standardu. Ta standard ne velja niti za mehansko polnjene peči za savno, peči za savno z ventilacijo zraka za izgorevanje, peči za savno, opremljene s kotlom, peči za savno z vgrajenimi dimnimi cevmi ali peči za savno, ki imajo kakršno koli električno povezavo.

General Information

Status
Published
Public Enquiry End Date
19-Oct-2008
Publication Date
05-Jan-2011
Technical Committee
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
12-Oct-2010
Due Date
17-Dec-2010
Completion Date
06-Jan-2011

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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Mehrfach befeuerbare Saunaöfen zur Verfeuerung fester Brennstoffe - Anforderungen und PrüfverfahrenPoêles de sauna à allumage multiple à combustible solide - Exigences et méthodes d'essaiMulti firing Sauna stoves fired by solid fuel - Requirements and test methods97.100.30Grelniki na trdo gorivoSolid fuel heatersICS:Ta slovenski standard je istoveten z:EN 15821:2010SIST EN 15821:2011en,fr01-februar-2011SIST EN 15821:2011SLOVENSKI

STANDARD
SIST EN 15821:2011
EUROPEAN STANDARD NORME EUROPÉENNE EUROPÄISCHE NORM
EN 15821
September 2010 ICS 97.100.10 English Version

Multi-firing sauna stoves fired by natural wood logs - Requirements and test methods

Poêles de sauna à allumage multiple à bûches de bois naturelles - Exigences et méthodes d'essai

Mehrfach befeuerbare Saunaöfen zur Verfeuerung fester Brennstoffe - Anforderungen und Prüfverfahren This European Standard was approved by CEN on 7 August 2010.

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 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 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, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and United Kingdom.

EUROPEAN COMMITTEE FOR STANDARDIZATION
COMITÉ EUROPÉEN DE NORMALISATION EUROPÄISCHES KOMITEE FÜR NORMUNG
Management Centre:
Avenue Marnix 17,

B-1000 Brussels © 2010 CEN All rights of exploitation in any form and by any means reserved worldwide for CEN national Members. Ref. No. EN 15821:2010: ESIST EN 15821:2011

EN 15821:2010 (E) 2 Contents Page Foreword ............................................................................................................................................................. 41Scope ...................................................................................................................................................... 52Normative references ........................................................................................................................... 53Terms and definitions ........................................................................................................................... 54Requirements for materials, design and construction ..................................................................... 94.1Production documentation .................................................................................................................. 94.2Construction ........................................................................................................................................ 104.2.1General construction .......................................................................................................................... 104.2.2Cleaning of heating surfaces ............................................................................................................. 104.2.3Flue spigot or socket .......................................................................................................................... 104.2.4Ashpan and ash removal .................................................................................................................... 104.2.5Bottomgrate ......................................................................................................................................... 114.2.7Control of flue gas .............................................................................................................................. 114.2.8Firedoors and charging doors ........................................................................................................... 114.2.9Flue bypass device ............................................................................................................................. 124.2.10Front firebars and/or deepening plate .............................................................................................. 125Safety requirements ............................................................................................................................ 125.1Temperature rise of the operating components .............................................................................. 125.2Temperature of adjacent combustible materials ............................................................................. 126Performance requirements ................................................................................................................ 126.1Flue gas temperature .......................................................................................................................... 126.2Carbon monoxide emission ............................................................................................................... 136.3Efficiency ............................................................................................................................................. 136.4Flue draught ........................................................................................................................................ 136.5Refuelling loads .................................................................................................................................. 136.6Space heating output .......................................................................................................................... 137Instructions .......................................................................................................................................... 137.1General ................................................................................................................................................. 137.2Installation instructions ...................................................................................................................... 137.3User operating instructions ............................................................................................................... 148Evaluation of conformity .................................................................................................................... 158.1General ................................................................................................................................................. 158.2Initial type testing ................................................................................................................................ 168.2.1General ................................................................................................................................................. 168.2.2Initial type testing for appliance changes ........................................................................................ 178.3Factory production control (FPC) ..................................................................................................... 198.3.1General ................................................................................................................................................. 198.3.2Raw materials and components ........................................................................................................ 198.3.3Control of inspection, measuring and test equipment ................................................................... 198.3.4Process control ................................................................................................................................... 198.3.5Product inspection, testing and evaluation ..................................................................................... 198.3.6Non conforming products .................................................................................................................. 218.3.7Corrective and preventive action ...................................................................................................... 218.3.8Handling, storage, packaging, preservation and delivery .............................................................. 219Marking................................................................................................................................................. 21Annex A (normative)

Test methods ................................................................................................................ 22A.1Test environment ................................................................................................................................ 22A.1.1Sauna test room temperature ............................................................................................................ 22SIST EN 15821:2011

EN 15821:2010 (E) 3 A.1.2Ambient air temperature coming into the sauna test room ........................................................... 22A.1.3External sources ................................................................................................................................. 22A.2Test assembly ..................................................................................................................................... 22A.2.1General ................................................................................................................................................. 22A.2.2Sauna test room .................................................................................................................................. 23A.2.3Measurement section ......................................................................................................................... 23A.2.4Connection of appliance to measurement section ......................................................................... 24A.3Measurement equipment ................................................................................................................... 25A.4Test procedures .................................................................................................................................. 25A.4.1Appliance installation ......................................................................................................................... 25A.4.2Fuel load .............................................................................................................................................. 25A.4.3Fuelling and de-ashing the fire .......................................................................................................... 26A.4.4Flue gas losses ................................................................................................................................... 26A.4.5Combustible heat losses in the residue ........................................................................................... 26A.4.6Performance test at nominal heat output ......................................................................................... 26A.4.7Temperature safety test ..................................................................................................................... 28A.5Test results .......................................................................................................................................... 29A.6Calculation methods........................................................................................................................... 29A.6.1Notations and units used ................................................................................................................... 29A.6.2Formulae .............................................................................................................................................. 31A.7Test report ........................................................................................................................................... 33Annex B (normative)

Test fuels and recommended fuels ............................................................................ 43B.1General ................................................................................................................................................. 43B.2Test fuel ............................................................................................................................................... 43B.2.1Selection of test fuel ........................................................................................................................... 43B.2.2Storage, preparation and analysis .................................................................................................... 43Annex ZA (informative)

Clauses of this European Standard addressing the provisions of the EU Construction Products Directive ....................................................................................................... 46ZA.1Scope and relevant characteristics .................................................................................................. 46ZA.2Procedure for the attestation of conformity of multi-firing sauna stoves fired by natural wood logs ............................................................................................................................................ 48ZA.3CE marking and labelling ................................................................................................................... 50 SIST EN 15821:2011

EN 15821:2010 (E) 4 Foreword This document (EN 15821:2010) has been prepared by Technical Committee CEN/TC 295 “Residential solid fuel burning appliances”, 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 March 2011, and conflicting national standards shall be withdrawn at the latest by June 2012. 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, and supports essential requirements of EC Directive(s). For relationship with EC Directive(s), see informative Annex ZA, which is an integral part of this document. 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, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia, Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain, Sweden, Switzerland and the United Kingdom. SIST EN 15821:2011

EN 15821:2010 (E) 5 1 Scope This European Standard covers multi-firing sauna stoves in which the heating stones are separated from and indirectly heated by the fire and the flue gases and which may be re-fuelled with several fuel loads. This European Standard specifies requirements relating to the design, manufacture, construction, safety and performance (efficiency and emission) of multi-firing sauna stoves fired by wood logs and provides instructions for them. Furthermore, it also gives provisions for evaluation of conformity (i.e. initial type testing (ITT) and factory production control (FPC) and marking of these products. This standard is applicable to hand-fuelled intermittent burning multi-firing sauna stoves, which provide heat into the space where they are installed. These multi-firing sauna stoves may be supplied either as an assembled appliance or as a manufacturer’s pre-designed unit consisting of pre-fabricated components designed to be built on site in accordance with the manufacturer’s specified assembly instructions. One-off installations are not included. These multi-firing sauna stoves may burn only natural wood logs in accordance with the appliance operating instructions.

Single-firing heat storage sauna stoves, in which the stones are directly heated by the fire and the flue gases, which pass through them, are not covered by this European Standard. This standard is also not applicable to mechanically fed sauna stoves, sauna stoves having fan assisted combustion air, sauna stoves fitted with a boiler, sauna stoves with incorporated flue or sauna stoves having any electrical connection. 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 14774-1, Solid biofuels  Determination of moisture content  Oven dry method  Part 1: Total moisture  Reference method EN 14775, Solid biofuels  Determination of ash content EN 14918, Solid biofuels  Determination of calorific value EN 15104, Solid biofuels  Determination of total content of carbon, hydrogen and nitrogen  Instrumental methods EN 15148, Solid biofuels  Determination of the content of volatile matter EN 15289, Solid Biofuels  Determination of total content of sulphur and chlorine EN 60335-2-53, Household and similar electrical appliances  Safety  Part 2-53: Particular requirements for sauna heating appliances (IEC 60335-2-53:2002) EN ISO 9001:2008, Quality management systems  Requirements (ISO 9001:2008) ISO 2859 (all parts), Sampling procedures for inspection by attributes 3 Terms and definitions For the purposes of this document, the following terms and definitions apply. SIST EN 15821:2011

EN 15821:2010 (E) 6 3.1 air grilles components in the inlet and outlet openings to distribute and direct convection air flow 3.2 air inlet control manual or automatic device which controls the quantity of air supplied for combustion 3.3 appliance family group of appliances of similar construction and/or performance characteristics where it is permissible to test only selected appliances in accordance with the requirements of this standard 3.4 ash content of the fuel solid matter remaining after the complete combustion of solid fuel 3.5 ashpan removable receptacle shaped to receive the residue falling from the firebed 3.6 ashpit enclosed chamber designed to receive the residue or the ashpan 3.7 ashpit loss part of the residue which is combustible 3.8 basic firebed quantity of glowing embers which ensures ignition of the test fuel to be charged NOTE The basic firebed may be specified in the operating instructions.

3.9 batch charge proportion of the test load as declared in the operating manual that can be added at specified intervals during the test period of the burning rate performance test 3.10 bottomgrate part of the appliance at the base of the firebox which supports the firebed through which the residue falls into the ashpan or ashpit and through which combustion air and/or combustion gases may be drawn 3.11 bottomgrate bars firebars bars supporting the fuelbed, separate or integral with a surrounding frame 3.12 charging door door which covers the refuelling opening 3.13 combustion air air supplied to the firebox which is entirely or partially used to burn the fuel 3.14 combustion gases compounds in gaseous form produced inside an appliance when fuel is burned SIST EN 15821:2011

EN 15821:2010 (E) 7 3.15 de-ashing process of clearing a fuelbed and discharging the residue into the collecting receptacle 3.16 de-ashing mechanism device to agitate or disturb the ash to facilitate its removal from the firebed NOTE

It may also be used to change the bottomgrate operating position on some multi-firing sauna stoves. 3.17 draught regulator inlet device for admission of air downstream of the firebed, enabling the flue draught to be controlled 3.18 efficiency ratio of total heat output to the total heat input during the burning period expressed as a percentage 3.19 firebox combustion chamber part of the multi-firing sauna stove in which the fuel is burned 3.20 firebox opening aperture in the firebox through which a multi-firing sauna stove may be fuelled 3.21 firedoor door through which the fire may be viewed and which may be opened to allow refuelling of the firebed 3.22 flue by-pass device device which in the open position allows flue gases to pass directly to the flue spigot/socket NOTE

This can be used as a preheating aid to overcome chimney condensation.

3.23 flue damper mechanism to change the flow of the combustion gases 3.24 flue draught differential between the static pressure in the place of installation and the static pressure at the flue gas measurement point 3.25 flue gases gaseous compounds leaving the multi-firing sauna stove flue spigot or socket and entering the flue gas connector 3.26 flue gas connector duct through which flue gases are conveyed from the flue spigot of the multi-firing sauna stove into the chimney flue 3.27 flue gas mass flow mass of flue gas drawn off from the multi-firing sauna stove per unit of time SIST EN 15821:2011

EN 15821:2010 (E) 8 3.28 flue gas temperature temperature of the flue gas at the specified point in the measurement section 3.29 flue spigot flue socket integral part of the multi-firing sauna stove for connecting the flue gas connector thus permitting the deliberate escape of products of combustion into the chimney flue 3.30 flueway part of a multi-firing sauna stove designed to convey combustion gases from the firebox to the flue spigot/socket 3.31 front firebars grating or plate fitted at the front of the firebox opening to prevent spillage of fuel and ash or to change the firebox capacity, or both 3.32 total heat input quantity of energy which the fuel provides to the multi-firing sauna stove

3.33 integral fuel storage container enclosed area forming part of the multi-firing sauna stove, but not connected directly to the fuel charging area, in which fuel is stored prior to it being physically transferred by the user to the fuel charging position 3.34 operating tool device supplied with the multi-firing sauna stove for handling movable and/or hot components 3.35 primary air combustion air which passes through the fuel bed 3.36 recommended fuel fuel of commercial quality, listed in the multi-firing sauna stove operating instructions, and shown to achieve the claimed performance when tested in accordance with this European Standard 3.37 residue ashes, including combustibles, which collect in the ashpit 3.38 sauna stove stove that has a fully enclosed firebox with a firedoor which is normally closed, that distributes heat by radiation and/or convection and is also fitted with stones or other heat retaining material onto which water is poured to produce hot steam/vapour that rises from the hot sauna stones, and that may also provide hot water for washing when fitted with an optional open water vessel

3.39 multi-firing sauna stove sauna stove in which the stones are separated from and indirectly heated by the fire and the flue gases and which may be refuelled with several successive fuel loads also during sauna bathing 3.40 solid fuel naturally occurring or manufactured solid mineral fuels, natural or manufactured wood logs and peat briquettes SIST EN 15821:2011

EN 15821:2010 (E) 9 3.41 space heating output heat output provided as convection and radiation to the room 3.42 test fuel fuel of commercial quality being representative of its type to be used for testing multi-firing sauna stoves 3.43 test load mass of test fuel declared in the operating instructions for the burning rate performance test NOTE

The test load can be added as batch charges if this is indicated in the multi-firing sauna stove instructions. 3.44 total heat output total heat output of the multi-firing sauna stove quoted in the operating instructions and achieved under defined test conditions when burning the specified test fuel and calculated as the total heat input less the flue and unburned carbon losses 3.45 water vessel open container in which water for washing purposes is heated and which is fitted as an option on a sauna stove 3.46 working surfaces surfaces of an multi-firing sauna stove designed to transmit heat to the surrounding atmosphere 4 Requirements for materials, design and construction 4.1 Production documentation The type of multi-firing sauna stove submitted for testing shall be stated. The parameters and characteristics considered in making the decisions in relation to either the family or range of multi-firing sauna stoves to be submitted for initial type testing (see 8.2.1) shall be recorded. Where changes are made to a multi-firing sauna stove in the design, the raw material, the supplier of the components, or in the production process, which would significantly alter the performance characteristics of the appliance, especially in respect of one or more of the list of characteristics detailed in Table 1 and Table 2 (see 8.2.2), these shall be recorded. A copy of the parameters and characteristics considered in making the decisions shall be included in the production documentation for each multi-firing sauna stove. To identify a multi-firing sauna stove, related documents and/or scaled assembly drawings shall be available showing the basic design and construction of the multi-firing sauna stove. The documentation and/or the drawings shall include at least the following information:  the specification of the materials used in the construction of the multi-firing sauna stove;  the fuel loading mass and, if applicable, the number and mass of any batch charges. For multi-firing sauna stoves, which are supplied as pre-designed units consisting of prefabricated components, designed to be assembled on site, then detailed assembly instructions for the construction of the appliance shall be provided. In addition, details of making a gas tight connection between the chimney, the appliance and the flue gas connector shall also be provided. For testing purposes the multi-firing sauna stove shall be constructed and tested in accordance with these instructions. SIST EN 15821:2011

EN 15821:2010 (E) 10 4.2 Construction
4.2.1 General construction 4.2.1.1 Design, manufacture and assembly

The shape and dimensions of the components and equipment of multi-firing sauna stoves and the method of design and manufacture and, if assembled on site, the method of assembly and installation shall ensure that, when operated as specified in accordance with the test procedures of this standard and exposed to the associated mechanical, chemical and thermal stresses, the multi-firing sauna stove shall operate reliably and safely so that, during normal operation, no combustion gas posing a hazard can escape into the room in which the multi-firing sauna stove is installed, nor can embers fall out. Non-combustible materials shall be used except for the following applications:

 components or accessories fitted outside the multi-firing sauna stove;  internal components of controls and safety equipment;  operating handles. No part of the multi-firing sauna stove shall comprise any material known to be harmful. Component parts of the multi-firing sauna stove, which require periodic replacement and/or removal, shall be either so designed or marked for identification to ensure correct fitting. NOTE

Because the entire heat dissipating surfaces of the appliance including the flue spigot/socket and the flue gas connector are working surfaces, there is no requirement for limiting the surface temperature of the appliance. 4.2.1.2 Durability

The durability aspects of the multi firing sauna stove shall be deemed to be satisfied if it is shown to meet the constructional requirements specified in 4.2.2 to 4.2.10, the safety requirements specified in Clause 5 and the performance requirements specified in Clause 6 of this standard. NOTE The long practice with these products shows that such an approach for dealing with durability is sufficient. 4.2.2 Cleaning of heating surfaces All heating surfaces shall be accessible from the flue gas side for inspection and cleaning with brushes, scrapers or chemical agents by means of sufficient cleaning openings.

4.2.3 Flue spigot or socket The flue spigot or socket shall be designed to enable a gas tight connection to be made between the flue gas connector and the multi-firing sauna stove. Where the flue gas connector fits over an outlet spigot, the overlap shall be a minimum of 25 mm. Where the flues gas connector fits into a socket, the insertion depth shall be a minimum of 25 mm. NOTE It is recommended that provision is made for sealing internal connections with heat resistant sealing compound and/or sealing rope, if required. 4.2.4 Ashpan and ash removal A means for the removal of the ash residue from the multi-firing sauna stove shall be provided. When an ashpan is provided, it shall be capable of containing the combustion residue from two full charges of fuel whilst retaining sufficient space above to allow adequate primary air flow through the bottom grate or firebed. If the ashpan resides in the multi-firing sauna stove, it shall locate in the ashpit in such a way that it allows the free passage of p

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