Independent gas-fired convection heaters incorporating a fan to assist transportation of combustion air and/or flue gases

This European standard specifies the requirements and test methods for construction, safety, fitness for purpose, rational use of energy, classification and marking of gas-fired convection heating appliances that are fitted with fan-assisted atmospheric burners, and fully pre-mixed burners. This European standard applies to independent convection heaters, burning gas having a fan to assist the transportation of combustion air and/or flue gases, hereafter referred to as 'appliances'.

Konvektions-Raumheizer für gasförmige Brennstoffe mit gebläseunterstützter Verbrennungsluftzu- und/oder Abgasabführung

Diese Europäische Norm legt Anforderungen und Prüfbestimmungen für Bau, Sicherheit und rationelle Energienutzung von Konvektions-Raumheizern für gasförmige Brennstoffe mit gebläseunterstützten atmosphärischen Brennern oder Vollvormischbrennern fest.
Die vorliegende Norm gilt für Konvektions-Raumheizern für gasförmige Brennstoffe mit gebläseunterstützter Verbrennungsluftzu- und/oder Abgasabführung, nachfolgend Gerät genannt:
   der Art B12, B13, B14, B22, B23, C12, C13, C32, C33, C42, C43, C52, C53, C62 und C63 (siehe 4.2);
   an der Wand befestigt, freistehend oder eingebaut;
   mit einer Nennwärmebelastung bis 20 kW (bezogen auf den Heizwert).
Diese Europäische Norm gilt auch für Geräte mit Kaminfeuereffekt.
Vorliegende Europäische Norm gilt nicht für
a)   Geräte mit offener Verbrennungskammer gemäß prEN 13278:1998;
b)   Geräte mit Gebläsebrenner gemäß EN 676;
c)   Warmlufterzeuger;
d)   Geräte, die mit einer Verschlussplatte installiert werden (siehe 3.3.3.8).
Die vorliegende Europäische Norm gilt für Geräte, die für eine Baumusterprüfung vorgesehen sind.
Fragen im Zusammenhang mit Qualitätssicherung, Kontrollprüfung während der Produktion und Konformitätszertifikate von Hilfsgeräten werden nicht in dieser Norm behandelt.
1   Normative Verweisungen

Appareils de chauffage indépendants à convection utilisant les combustibles gazeux et intégrant un ventilateur pour faciliter l'alimentation en air comburant et/ou l'évacuation des produits de combustion

La présente Norme européenne définit les exigences et méthodes d'essais pour la construction, la sécurité, le marquage et l'utilisation rationnelle de l'énergie des appareils de chauffage indépendants à convection utilisant les combustibles gazeux, et équipés de brûleurs atmosphériques à ventilateur, ou de brûleurs à prémélange total.La présente norme s'applique aux appareils de chauffage indépendants à convection, utilisant les combustibles gazeux et équipés d'un ventilateur pour faciliter l'alimentation en air comburant et/ou l'évacuation des produits de combustion, appelés ci après "appareils" :
   qui sont de types B12, B13, B14, , B22, B23, C12, C13, C32, C33, C42, C43, C52, C53, C62 et C63 (voir 4.2) ;
   à poser, à fixer au mur ou à encastrer ;
   de débit calorifique nominal inférieur ou égal à 20 kW (sur le pouvoir calorifique inférieur).
Elle s'applique également aux appareils ayant un effet décoratif de combustion.
Elle ne s'applique pas :
a)   aux appareils à foyer ouvert comme ceux spécifiés dans le prEN 13278:1998 ;
b)   aux appareils avec brûleurs automatiques à tirage forcé, comme ceux spécifiés dans l'EN 676 ;
c)   aux appareils de distribution d'air par gaine ;
d)   aux appareils installés au moyen d'une plaque de fermeture (voir 3.3.3.8).
La présente norme ne s'applique qu'aux appareils qui sont destinés aux essais de type.
Les points relatifs à l'assurance qualité des systèmes, aux essais en production et aux certificats de conformité des équipements auxiliaires ne sont pas traités dans cette norme.

Prostostoječi plinski konvekcijski grelniki z ventilatorjem za zgorevalni zrak in/ali dimne pline

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22-Oct-2002
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2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.Independent gas-fired convection heaters incorporating a fan to assist transportation of combustion air and/or flue gasesAppareils de chauffage indépendants a convection utilisant les combustibles gazeux et intégrant un ventilateur pour faciliter l'alimentation en air comburant et/ou l'évacuation des produits de combustionKonvektions-Raumheizer für gasförmige Brennstoffe mit gebläseunterstützter Verbrennungsluftzu- und/oder AbgasabführungTa slovenski standard je istoveten z:EN 1266:2002SIST EN 1266:2004en,fr,de97.100.20ICS:SLOVENSKI

STANDARDSIST EN 1266:200401-januar-2004

EUROPEAN STANDARDNORME EUROPÉENNEEUROPÄISCHE NORMEN 1266October 2002ICS 97.100.20English versionIndependent gas-fired convection heaters incorporating a fan toassist transportation of combustion air and/or flue gasesAppareils de chauffage indépendants à convection utilisantles combustibles gazeux et intégrant un ventilateur pourfaciliter l'alimentation en air comburant et/ou l'évacuationdes produits de combustionKonvektions-Raumheizer für gasförmige Brennstoffe mitgebläseunterstützter Verbrennungsluftzu- und/oderAbgasabführungThis European Standard was approved by CEN on 11 January 2001.CEN members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this EuropeanStandard the status of a national standard without any alteration. Up-to-date lists and bibliographical references concerning such nationalstandards may be obtained on application to the 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 translationunder the responsibility of a CEN member into its own language and notified to the Management Centre has the same status as the officialversions.CEN members are the national standards bodies of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece,Iceland, Ireland, Italy, Luxembourg, Malta, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom.EUROPEAN COMMITTEE FOR STANDARDIZATIONCOMITÉ EUROPÉEN DE NORMALISATIONEUROPÄISCHES KOMITEE FÜR NORMUNGManagement Centre: rue de Stassart, 36

B-1050 Brussels© 2002 CENAll rights of exploitation in any form and by any means reservedworldwide for CEN national Members.Ref. No. EN 1266:2002 E

EN 1266:2002 (E)2ContentsForeword.................................................................................................................................................41Scope..........................................................................................................................................52Normative references................................................................................................................53Terms and definitions...............................................................................................................63.1Independent gas-fired convection heaters.............................................................................63.2Gases..........................................................................................................................................73.3Appliance construction............................................................................................................83.4Adjusters and controls...........................................................................................................123.5Appliance performance..........................................................................................................133.6Marking of the appliance and packaging..............................................................................154Classification of appliances...................................................................................................154.1Classification according to the nature of the gases used (categories).............................154.2Classification according to the method of evacuating the products ofcombustion (types).................................................................................................................185Constructional requirements.................................................................................................205.1Conversion to different gases...............................................................................................205.2Materials and method of construction..................................................................................215.3Accessibility for use and maintenance.................................................................................225.4Connections.............................................................................................................................225.5Soundness of the gas circuit.................................................................................................235.6Soundness of the combustion circuit...................................................................................235.7Supply of combustion air and evacuation of combustion products.................................245.8Electrical equipment...............................................................................................................255.9Safety in the event of fluctuation, interruption and restoration of the auxiliaryenergy.......................................................................................................................................255.10Air proving devices.................................................................................................................265.11Adjusting, control and safety devices..................................................................................265.12Ignition burner.........................................................................................................................295.13Burners.....................................................................................................................................305.14Motors and fans.......................................................................................................................305.15Gas pressure test points........................................................................................................305.16Confirmation of operation......................................................................................................306Operational requirements......................................................................................................316.1General.....................................................................................................................................316.2Soundness of the gas circuit and combustion products circuit , and evacuation ofthe combustion products.......................................................................................................316.3Heat inputs...............................................................................................................................326.4Temperature of various parts of the appliance....................................................................326.5Ignition, cross-lighting and flame stability...........................................................................336.6Pressure governors................................................................................................................346.7Combustion.............................................................................................................................356.8Sooting (live fuel effect appliances only).............................................................................356.9Spillage monitoring system (type B appliances only).........................................................366.10Flame supervision device......................................................................................................376.11Air proving device...................................................................................................................376.12Efficiency.................................................................................................................................397Test methods...........................................................................................................................397.1General.....................................................................................................................................39

EN 1266:2002 (E)37.2Soundness of the gas circuit and combustion products circuit, and evacuation ofthe combustion products.......................................................................................................477.3Heat inputs...............................................................................................................................497.4Temperature of various parts of the appliance....................................................................517.5Ignition, cross-lighting and flame stability...........................................................................537.6Pressure governors................................................................................................................587.7Combustion.............................................................................................................................597.8Sooting (live fuel effect appliances only).............................................................................647.9Spillage monitoring system (type B appliances only).........................................................657.10Flame supervision device......................................................................................................677.11Air proving device...................................................................................................................687.12Efficiency.................................................................................................................................708Marking and instructions.......................................................................................................728.1Marking.....................................................................................................................................728.2Instructions..............................................................................................................................75Annex A (informative)

National situations.........................................................................................98Annex B (normative)

Classification of appliances..........................................................................110Annex C (normative)

Requirements and test methods for separate air supply andcombustion products evacuation ducts.............................................................................115Annex D (normative)

High voltage ignition circuits........................................................................120Annex E (informative)

Gas valve arrangements..............................................................................122Annex F (informative)

Spillage test methods...................................................................................123Annex G (normative)

Calculation of conversions of NOx...............................................................129Annex H (normative)

Apparatus for the determination of the smoke number.............................130Annex I (informative)

Means of identification of the types of gas in force in the variouscountries................................................................................................................................131Annex J (normative)

Special national conditions...........................................................................132Annex K (informative)

A-deviations..................................................................................................133Annex ZA (informative)

Clauses of this European Standard addressing essentialrequirements or other provisions of EU Directives...........................................................134

EN 1266:2002 (E)4ForewordThis document (EN 1266:2002) has been prepared by Technical Committee CEN/TC 62"Independent gas-fired space heaters", the secretariat of which is held by BSI.This European Standard shall be given the status of a national standard, either by publication of anidentical text or by endorsement, at the latest by April 2003, and conflicting national standards shallbe withdrawn at the latest by April 2003.This document has been prepared under a mandate given to CEN by the Commission and theEuropean Free Trade Association, and supports the essential requirements of Directive 90/396/EEC.For relationship with EU Directives, see informative annex ZA, which is an integral part ofthisdocument.According to the CEN/CENELEC Internal Regulations, the national standards organizations of thefollowing countries are bound to implement this European Standard: Austria, Belgium, CzechRepublic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Malta,Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and the United Kingdom.

EN 1266:2002 (E)51 ScopeThis European Standard specifies the requirements and test methods for the construction, safety,marking and rational use of energy of independent gas-fired convection heating appliances that arefitted with fan-assisted atmospheric burners, or fully pre-mixed burners.This standard is applicable to independent convection heaters, burning gas having a fan to assist thetransportation of combustion air and/or flue gases, hereafter referred to as 'appliances':¾ that are types B12, B13, B14, B22, B23, C12, C13, C32, C33, C42, C43, C52, C53, C62 and C63 (see 4.2);¾ that are wall mounted, free-standing or built-in;¾ that have a nominal heat input not exceeding 20 kW (based on the net calorific value).In addition, this standard is applicable to live fuel effect appliances.This standard is not applicable to:a) open fronted appliances to prEN 13278:1998;b) appliances fitted with automatic forced-draught burners to EN 676;c) ducted-air appliances;d) appliances installed by means of a closure plate (see 3.3.3.8).This standard is only applicable to appliances which are intended to be type tested.Matters related to quality assurance systems, tests during production and to certificates of conformityof auxiliary devices are not dealt with by this standard.2 Normative referencesThis European Standard incorporates by dated or undated reference, provisions from otherpublications. These normative references are cited at the appropriate places in the text and thepublications are listed hereafter. For dated references, subsequent amendments to or revisions of anyof these publications apply to this European Standard only when incorporated in it by amendment orrevision. For undated references the latest edition of the publication referred to applies (includingamendments).EN 88:1991, Pressure governors for gas appliances for inlet pressure up to 200 mbarEN 125:1991, Flame supervision devices for gas-burning appliances — Thermo-electric flamesupervision devicesEN 126:1995, Multifunctional controls for gas burning appliancesEN 161:1991, Automatic shut-off valves for gas burners and gas appliancesEN 257:1992, Mechanical thermostats for gas-burning appliancesEN 298:1993, Automatic gas burner control systems for gas burners and gas burning appliances withor without fansEN 437:1993, Test gases — Test pressures — Appliance categories

EN 1266:2002 (E)6EN 12067-1:1998, Gas/air ratio controls for gas burners and gas burning appliances —Part 1: Pneumatic typesprEN 13278:1998, Open fronted gas-fired independent space heatersEN 60335-1:1994, Safety of household and similar electrical appliances —Part 1: General requirements (IEC 335-1:1991)EN 60529:1991, Degrees of protection provided by enclosures (IP code) (IEC 529:1989)EN 60730-2-9:1995, Automatic electrical controls for household and similar use —Part 2: Particular requirements for temperature sensing controlsCR 1404:1994, Determination of emissions from appliances burning gaseous fuels during type-testingEN ISO 3166-1:1997, Codes for the representation of names of countries and their subdivisions —Part 1: Country codes (ISO 3166-1:1997)ISO 7-1:1994, Pipe threads where pressure-tight joints are made on the threads —Part 1: Designation, dimensions and tolerancesISO 228-1:1994, Pipe threads where pressure-tight joints are not made on the threads —Part 1: Designation, dimensions and tolerancesISO 274:1975, Copper tubes of circular section — DimensionsIEC 60479-1:1984, Effects of current passing through the human body —Part 1: General aspectsIEC 60479-2:1987, Effects of current passing through the human body —Part 2: Special aspects3 Terms and definitionsFor the purposes of this standard the following terms and definitions apply:3.1 Independent gas-fired convection heaters3.1.1convection heaterconvection appliance that is designed to heat a room mainly by the emission of air heated byconvection. Such an appliance may also contain radiant heating elements provided that it complieswith all the requirements of this standard3.1.2forced convection heaterconvection appliance that incorporates a fan and thus allows an acceleration of the circulation of theair in contact with the heating body. Such an appliance is designed to discharge air directly into theroom in which the appliance is installed and not to be connected to a warm air distribution system3.1.3convection fandevice to assist in the distribution of heated air3.1.4live fuel effect convection heaterconvection appliance which simulates the visual effect of a solid fuel appliance

EN 1266:2002 (E)73.1.5open-fronted applianceappliance which has exposed flames or exposed incandescent areas3.1.6working surfacesthose parts of an appliance, which, due to the nature of the appliance, have temperatures exceedingthe limits specified in 6.4.1 excluding parts that are likely to be touched during operations carried outin the normal use of the appliance, for example, the area adjacent to control knobsWorking surfaces do not include that part of any surface within 25 mm of parts that have to betouched or removed during normal operation of the appliance.3.2 Gases3.2.1reference conditions¾ for calorific values, temperature: 15 °C;¾ for gas and air volumes dry, brought to 15 °C and an absolute pressure of 1 013,25 mbar3.2.2calorific valuequantity of heat produced by the combustion, at a constant pressure of 1 013,25 mbar, of unit volumeor mass of gas, the constituents of the combustible mixture being taken at reference conditions andthe products of combustion being brought back to the same conditionsA distinction is made between:¾ the gross calorific value in which the water produced by combustion is assumed to becondensed.Symbol: Hs¾ the net calorific value in which the water produced by combustion is assumed to be in thevapour state.Symbol: HiUnits: either:¾ megajoules per cubic metre (MJ/m3) of dry gas at the reference conditions; or¾ megajoules per kilogram (MJ/kg) of dry gas;¾ [EN 437:1993].3.2.3relative densityratio of the masses of equal volumes of dry gas and dry air at the same conditions of temperature andpressureSymbol: d3.2.4Wobbe indexratio of the calorific value of a gas per unit volume and the square root of its relative density under thesame reference conditions. The Wobbe index is said to be gross or net according to whether thecalorific value used is the gross or net calorific value

EN 1266:2002 (E)8Symbol: gross Wobbe index: Ws;: net Wobbe index: Wi.Units: either:¾ megajoules per cubic metre (MJ/m3) of dry gas at the reference conditions; or¾ megajoules per kilogram (MJ/kg) of dry gas.[EN 437:1993]3.2.5test pressuresgas pressures used to verify the operational characteristics of appliances using combustible gases.They consist of normal and limit pressuresThey are expressed in millibars (mbar).NOTE1 mbar = 100 Pa.3.2.6normal pressurepressure under which the appliances operate in nominal conditions, when they are supplied with thecorresponding reference gasSymbol: pn3.2.7limit pressurespressures representative of the extreme variations in the appliance supply conditionsSymbols:maximum pressure: pmax;minimum pressure: p min.3.2.8pressure couplecombination of two distinct gas distribution pressures applied by reason of the significant differenceexisting between the Wobbe indices within a single family or group in which:¾ the higher pressure corresponds only to gases of low Wobbe index;and¾ the lower pressure corresponds to gases of high Wobbe index.[EN 437:1993]3.3 Appliance construction3.3.1 The gas circuit3.3.1.1inlet connectionpart of the appliance intended to be connected to the gas supply

EN 1266:2002 (E)93.3.1.2mechanical jointconnection device assuring soundness in an assembly of several parts, generally of metalExample:¾ cone seated joints¾ torroidal sealing rings ('O' rings)¾ flat joints¾ metal to metal joints3.3.1.3gas circuitpart of an appliance that conveys or contains the gas between the appliance gas inlet connection andthe burner(s)3.3.1.4gas restrictornon-adjustable device which is placed in the gas circuit so as

to create a pressure drop and thusreduce the gas pressure at the burner to a predetermined value for a given supply pressure and rate3.3.1.5gas rate adjustercomponent intended for the manufacturer or installer to set the gas rate to each burner at apredetermined value according to the supply conditionsThe adjustment may be progressive (screw adjuster) or discontinuous (changing restrictors).The adjuster of an adjustable governor is regarded as a gas rate adjuster.The action of setting this device is called 'setting the gas rate'.3.3.1.6gas rate controlcomponent allowing the user to open or close the gas supply to one or more burners. It may also beused to adjust the gas rate of certain burners to a predetermined value, called the 'reduced rate'. Thisdevice may be a 'tap'3.3.1.7injectorcomponent that admits the gas into a burner3.3.1.8start gasinitial quantity of gas ignited to give a flame which is used to ignite the main burner. It may bedischarged through a separate ignition burner or part of the main burner3.3.2 Burner3.3.2.1main burnerburner that assures the thermal function of an appliance. It is usually called simply 'burner'3.3.2.2fully premixed burnerburner in which the gas and a quantity of air at least equal to that theoretically necessary for completecombustion are mixed before the combustion head

EN 1266:2002 (E)103.3.2.3ignition burnerseparate burner intended to light the main burner3.3.2.3.1permanent ignition burnerignition burner that operates continuously throughout the whole period that the appliance is in use3.3.2.3.2intermittent ignition burnerignition burner that is ignited before and extinguished at the same time as the main burner3.3.2.3.3alternating ignition burnerignition burner that is extinguished as soon as ignition of the main burner is effected. It re-ignites atthe main burner flame just before the latter goes out3.3.2.4fixed primary aeration restrictornon-adjustable device which limits the supply of primary air to a burner3.3.3 Combustion products circuit3.3.3.1flue outletpart of a type B appliance (see 4.2) that connects with a flue to evacuate the products of combustion3.3.3.2draught diverterdevice placed in the combustion products circuit to reduce the influence of flue-pull and to minimizethe effect of down-draught on the burner flame stability and combustion3.3.3.3combustion products discharge safety devicedevice that automatically shuts off the gas supply to the main burner, and perhaps to the ignitionburner, when there is unacceptably high spillage of combustion products from the draught diverter3.3.3.4atmosphere sensing devicedevice designed to shut off the gas supply before the combustion products of the surroundingatmosphere reaches a set value3.3.3.5terminaldevice fitted at the end of the duct system to direct the flow of air and/or flue gases and to restrict theingress of foreign matter3.3.3.6C6 terminalterminal which is specially approved for type C6 appliances3.3.3.7adaption boxmeans of adapting the appliance for connection to different duct systems, e.g. from concentric toseparate ducts3.3.3.8closure platenon-combustible plate used to cover and seal the front plane of a builder's opening, or fireplaceopening, such that when the appliance is installed, any air flowing from the room into the flue does soin accordance with the design requirements of the appliance

EN 1266:2002 (E)11This plate contains an aperture through which the flue outlet spigot of the appliance projects into thecavity of the builder's opening, or fireplace recess, but is not connected to the flue.The plate may be a separate component, or an integral part of the appliance, e.g. the back panel, butin either case shall be considered as part of the appliance.3.3.3.9builders openingenclosure constructed by the builder to accommodate fireplace components3.3.3.10fireplace openingaperture formed in the face of the builder’s opening, the fireplace recess or fire surround if fitted3.3.3.11fireplace recessrecess formed by the inclusion of fireplace components in the builder’s opening3.3.3.12fitting piecedevice which allows for the fitting of the air supply and combustion products evacuation ducts to twoducts of a shared duct system for type C4 appliances. The fitting piece may be part of the appliance orof the air supply and/or combustion products evacuation system3.3.4 Auxiliary equipment3.3.4.1pressure governordevice that maintains, within a fixed range, a constant downstream pressure , independent of theupstream pressure and/or the gas rate3.3.4.2ignition devicedevice that ignites one or more burners3.3.4.3flame supervision devicedevice, including a sensing element, that causes the gas supply to a burner to be opened or closedaccording to the presence or absence of the flame that activates the sensing element3.3.4.4control knobcomponent designed to be moved by hand in order to operate an appliance control (tap, thermostat,etc.)3.3.4.5full sequence automatic control unitcontrol unit which can automatically bring an appliance into operation from a completely shut downcondition in response to an external demand without the need for further intervention. This control unitcomprises a programming unit and all the elements of a flame detector device3.3.4.6flame detector devicedevice by which the presence of a flame is detected and signalledIt can consist of a flame sensor, an amplifier and a relay for signal transmission. These parts, with thepossible exception of the actual flame sensor, may be assembled in a single housing for use inconjunction with a programming unit.

EN 1266:2002 (E)123.3.4.7programming unitunit which reacts to signals from control and safety devices, gives control commands, controls thestart up sequence, supervises the burner operation and causes controlled shut-down, and ifnecessary safety shut-down and lock-out. The programming unit follows a predetermined sequence ofactions and always operates in conjunction with a flame detector device3.3.4.8automatic burner systemburner system in which, when starting from the completely shut-down condition, the gas is ignited andthe flame is detected and proved and the main gas valve(s) is actuated without manual intervention3.3.4.9restart interlock (manual)device which prevents the restoration of the gas supply to the main burner, or to the main burner andignition burner, until the end of the extinction delay time3.3.4.10purgemechanical introduction of air into the combustion circuit in order to displace any fuel/air mixture whichcould remain there. A distinction is made betweenpre-purgethe purge that takes place between the start command and the ignition devicebeing energized;andpost-purgethe purge that is carried out after burner shutdown.3.3.4.1.1air proving devicedevice intended to cause safety shut-down in the event of abnormal conditions of air admission or ofcombustion products evacuation3.3.4.1.2air/gas ratio devicedevice that automatically adapts the combustion air rate to the gas rate or vice versa3.4 Adjusters and controls3.4.1setting an adjusteraction of immobilizing an adjuster in the operating position by some means such as a screw , etc. It issaid that the adjuster is "set" in this position3.4.2sealing an adjusterprocedure by which after setting an adjuster, material is added such that any attempt to alter theadjustment setting is apparentA factory sealed pre-set adjuster is considered to be non-existent.A pressure governor is considered to be non-existent if it has been factory sealed in the fully openedposition.3.4.3putting a control out of serviceprocedure by which a control (of temperature, pressure, etc.) is put out of action and sealed in thisposition. The appliance then functions as if this device had been removed

EN 1266:2002 (E)133.5 Appliance performance3.5.1 Gas rates3.5.1.1volumetric flow ratevolume of gas consumed by the appliance in unit time during continuous operationSymbol: VUnits: cubic metres per hour (m3/h), litres per minute (l/min), cubic decimetres per hour (dm3/h),or cubic decimetres per second (dm3/s).[EN 437:1993]3.5.1.2mass flow ratemass of gas consumed by the appliance in unit time during continuous operationSymbol: MUnits: kilograms per hour (kg/h), or grams per hour (g/h).[EN 437:1993]3.5.1.3heat inputquantity of energy used in unit time corresponding to the volumetric or mass flow rates, the calorificvalue used being either the net or gross calorific valueSymbol: QUnit: kilowatt (kW)[EN 437:1993]3.

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