B1 The minimum requirements for permanent ventilation for certain appliances depend on knowledge of the air tightness of the dwelling where they are to be installed. Dwellings built after 2008 are likely to have evidence of the air tightness either through an individual air permeability test certificate or through representative testing of the same design of dwelling on the same housing development.

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B2 Older houses are unlikely to have been tested but are unlikely to achieve an air permeability of less than 5.0 m³ / (hr.m²) at 50 Pa unless the building fabric has been upgraded. These would include all or most of the following measures: – Full double (or triple) glazing; – Secondary glazing fitted; – Effective closures on trickle vents and other controllable ventilation devices; – All external doors with integral draught seals and letter box seals; – Internal and external sealing around doors and window frames; – Filled cavity or solid walls; – External insulation fitted; – Internal insulation plastered or with airtightness membrane fitted; – Impermeable overlay and edge sealing of suspended ground floors; – Careful sealing at junctions between building elements such as between walls and floors or ceilings; – Careful sealing around loft hatch; – Careful sealing around chimney or flue penetrations; – Careful sealing around internal soil pipe; – Careful sealing around domestic water and heating pipes passing into externally ventilated spaces; – Careful sealing of all service penetrations in the building fabric (electricity, gas, water, drainage, phone, TV aerial, etc.); – Internal warning pipe for WC; – All cable channels for light switches and power sockets sealed; – All cable entry for lighting and ceiling roses sealed. Recessed lighting should not penetrate ceilings below attic spaces

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B3 Failure to implement even a few of these measures will typically mean that the overall air permeability will probably exceed 5.0 m³ / (hr.m²) at 50 Pa. However individual rooms in some older houses with solid walls and solid floors can be inherently air-tight when fitted with modern glazing. The situation may therefore need to be assessed with respect both to the overall dwelling and to the individual room where the appliance is to be fitted. If in doubt then assume that the air permeability is lower than 5.0 m³ / (hr.m²) at 50 Pa and fit the appropriate permanent ventilation or seek specialist advice. Further information on sources of air leakage can be found in GPG224 Improving airtightness in dwellings.

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0.2 Explanation of terms In this Document, the following definitions apply: 1. Appliance: refers to a Heat Producing Appliance as defined in Regulation J7; 2. Compartment: an appliance compartment is an enclosure specifically constructed or adapted to accommodate one or more combustion appliances; 3. Chimney: structure consisting of a wall or walls (e.g. masonry or stainless steel) enclosing a flue or flues. They consist of different components which can be assembled, e.g. either – as a system chimney, that is installed using a combination of compatible chimney components, obtained or specified from one manufacturing source with product responsibility for the whole chimney (e.g. stainless steel chimneys), or – as custom-built chimney, that is installed or built on-site in accordance with an execution standard or local building regulations, using a combination of compatible chimney components that can be from one or more sources; 4. Flue: passage for conveying the products of combustion to the outside atmosphere; 5. Flue liner: wall of a chimney consisting of components the surface of which is in contact with products of combustion; 6. Connecting flue-pipe: component or components connecting the heating appliance outlet and the chimney; 7. Flue block: factory-made single – or multi-wall chimney component with one or more flues; 8. Gas fire: appliance constructed in a single cabinet incorporating a definite air path, a flue spigot for the controlled discharge of combustion products either directly into an existing flue or by passing through a purpose made closure plate. The radiant elements may be made to simulate burning solid fuel and/or may be partially enclosed by a heat resistant glass front plate; 9. Decorative Fuel-Effect fire (DFE): appliance whose function is primarily aesthetic, being designed to simulate an open solid fuel fire and which is intended to be installed within an open fireplace, so that the products of combustion pass unrestricted to the chimney or flue. It therefore does not incorporate a flue connection; 10. Inset Live Fuel-Effect fire (ILFE): appliance consisting of a purpose designed unit in a combination, which incorporates a flue box, fire bed and fire fret constructed in a manner, which controls both the combustion air and the products of combustion. The appliance is intended for installation within or partially in front of a builders opening. The unit may incorporate a method of recovering some heat from the combustion products to provide a convected heat output; 11. Open flued appliance: appliance designed to be connected to an openflue system, its combustion air being drawn from the room or space in which it is installed; 12. Room sealed appliance: appliance whose combustion system is sealed from the room in which the appliance is located and which obtains air for combustion from a ventilated uninhabited space within the premises or from air outside the premises and which vents the products of combustion directly to open air outside the premises; 13. Balanced flue: room-sealed appliance which draws its combustion air from a point adjacent to the point at which the combustion products are discharged, the inlet and outlet being so disposed that wind effects are substantially balanced; 14. Fanned flue systems: flue system in which the removal of flue products depend on a fan; 15. Open- flued fan assisted appliance: appliance incorporating a fan upstream or downstream of the burner taking combustion air from a room; 16. Flueless appliance: appliance designed for use without connection to a flue system, the products of combustion being allowed to mix with the air in a room or space in which the appliance is situated; 17. Fireplace recess: is a structural opening formed in a wall or chimney breast, from which a chimney leads and which has a hearth at its base; 18.

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A9 European chimney standards have been developed based on the material of the flue liner, e.g. clay/ceramic, concrete, metal and plastic. Some material based standards have adopted a different shortened designation, e.g. for clay flue a designation Liner – I.S. EN 1457-300-A1-N2 means it is suitable for a chimney with the designation T600 N2 D 3 G, with a nominal size of 300 mm. Table A5 and A6 gives the correlation between certain standards and the EN 1443 designations.

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A9 European chimney standards have been developed based on the material of the flue liner, e.g. clay/ceramic, concrete, metal and plastic. Some material based standards have adopted a different shortened designation, e.g. for clay flue a designation Liner – I.S. EN 1457-300-A1-N2 means it is suitable for a chimney with the designation T600 N2 D 3 G, with a nominal size of 300 mm. Table A5 and A6 gives the correlation between certain standards and the EN 1443 designations.

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A10 The designation of the corrosion resistance class of a metal chimney product is dealt with in I.S. EN 1856-1:2009 and I.S. EN 1856-2:2009 by a two – fold approach. A minimum material specification and thickness is allowed and products upon which a declaration has been made in this manner are designated Vm. The alternative approach involves the choice of one of three corrosion resistance tests. Products meeting the tests carry the designation V1, V2 or V3, as appropriate allow the product to be designated with the corrosion resistance class 1, 2 or 3 respectively. The material specification still forms part of the overall designation, and appears alongside the “V” letter, e.g. Vx- L40045. The material specification for the liner (or connecting pipe) is formed by the letter “L” followed by five digits. The first two digits represent the material type and the last three digits represent the material thickness in multiples of 0.01 m. Guidance on the minimum material specification appropriate for the various applications in terms of corrosion resistance (solid fuel, gas and oil) for use in Ireland for products complying with I.S. EN 1856-1 and 2 is given in Table A4. This should be complied with where corrosion tests to V1, V2 or V3 have not been carried out.

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A10 The designation of the corrosion resistance class of a metal chimney product is dealt with in I.S. EN 1856-1:2009 and I.S. EN 1856-2:2009 by a two – fold approach. A minimum material specification and thickness is allowed and products upon which a declaration has been made in this manner are designated Vm. The alternative approach involves the choice of one of three corrosion resistance tests. Products meeting the tests carry the designation V1, V2 or V3, as appropriate allow the product to be designated with the corrosion resistance class 1, 2 or 3 respectively. The material specification still forms part of the overall designation, and appears alongside the “V” letter, e.g. Vx- L40045. The material specification for the liner (or connecting pipe) is formed by the letter “L” followed by five digits. The first two digits represent the material type and the last three digits represent the material thickness in multiples of 0.01 m. Guidance on the minimum material specification appropriate for the various applications in terms of corrosion resistance (solid fuel, gas and oil) for use in Ireland for products complying with I.S. EN 1856-1 and 2 is given in Table A4. This should be complied with where corrosion tests to V1, V2 or V3 have not been carried out.

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A6 Corrosion resistance classes are set out in Table A3 – this is fuel dependant and expressed as 1, 2 or 3.

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