GENERAL GUIDANCE J O N L I N E V E R S I O N Diagram 6 The functions of hearths the flue and the temperature of the ambient air. Taller flues produce a greater draught at their base. Except for those balanced flue appliances which are designed to discharge directly through the wall adjacent to the appliance, a satisfactory natural draught requires an essentially vertical run of flue (see Diagram 4 (a) and (b)). a.
a body which is approved by the Secretary of State for Trade and Industry as being competent to carry out the required Attestation procedures for gas appliances and whose name and identification number has been notified by him/her to the Commission of the European Community and to other member States in accordance with the Gas Appliances (Safety) Regulations (1995); 31. Non-combustible material . This is the highest level of reaction to fire performance. Non-combustible materials include: b. a body which has been similarly approved for a.
any material which when tested to the purposes of the Gas Appliances Directive by another member State and whose name and identification number has been notified to the Commission and to other member States pursuant to the Gas Appliances Directive. BS 476-11:1982 (2007) does not flame nor cause any rise in temperature on either the centre (specimen) or furnace thermocouples; and b. products classified as non-combustible 33. An open-flued appliance is one which draws its combustion air from the room or space within which it is installed and which requires a flue to discharge its products of combustion to the outside air (see Diagram 4 (a), (c) and (e)).
in tests following the procedures in BS 476-4:1970 (2007); c. any material classified as class A1 in accordance with BS EN 13501-1:2002 Fire classification of construction products and building elements. Classification using data from reaction to fire tests. 34. A prefabricated appliance chamber is a set of factory-made precast concrete components designed to provide a fireplace recess to accommodate an appliance such as a stove, and incorporates a gather when used with an open fire. The chamber is normally positioned against a wall and may be designed to support a chimney. The chamber and chimney are often enclosed to create a false chimney breast (see also ‘flue box’).
Typical examples of such materials to be found in buildings include totally inorganic materials such as concrete, fired clay, ceramics, metals, plaster and masonry containing not more than 1 per cent by weight or volume of organic material. (Use in buildings of combustible metals such as magnesium–aluminium alloys should be assessed in each individual case.) 35. The rated heat input (sometimes shortened to rated input) for a gas appliance is the maximum heat input rate at which it can be operated, as declared on the appliance data plate. (See also heat input rate.) More detailed information is given in Approved Document B (Fire Safety). 36. The rated heat output for an oil appliance is 32.
A Notified Body , for the purposes of the Gas the maximum declared energy output rate (kW) as declared on the appliance data plate. Appliances (Safety) Regulations (1995), means: 15 Approved Document J Combustion appliances and fuel storage systems O N L I N E V E R S I O N