Requirements for the selection, design, installation and maintenance of flue systems connected to gas appliances.
This British Standard, a part of the BS 5440 series, specifies the selection, design, installation and maintenance requirements for flue systems which form part of a new or replacement appliance installation for domestic or commercial purposes. It also specifies requirements for connecting gas appliances to existing flues. It specifies natural and fanned draught flues for appliances which carry the CE mark, utilize 1st, 2nd or 3rd family gases and have rated heat inputs based on net (lower) calorific value (CV) not exceeding 70 kW. It may also be used for installations of appliances which do not carry the CE mark, e.g. used appliances, where appropriate, providing the appliance manufacturer’s instructions are available. In such circumstances, the installer should ensure that the appliance is safe in construction and condition, and can be used without constituting a danger.
The rating of 70 kW applies to an individual appliance connected to a flue system and, in the case of more than one appliance in the same room connected to a flue system, to the sum of the ratings. For shared flues, e.g. Se-ducts or U-ducts, the rating applies to the individual appliance rating per dwelling.
This standard deals with the complete flue equipment from the appliance connection, to the discharge point into outside air. It also covers flues that are intended originally for appliances burning other fuels but which are subsequently used for gas appliances.
This standard specifies residential park homes but not leisure accommodation vehicles.
This standard does not specify flue systems for decorative fuel effect fires which are specified in BS 5871-3.
History and related standards
This British Standard is a revision of the specification BS 5440-1:1990 which is superseded and withdrawn.
This standard includes the following cross-references:
BS 65, BS 715, BS 1289-1, BS 1289-2, BS EN 1457, BS 4543-2, BS 4543-3,
BS 5440-2:2000, BS 6461-1, BS 7435-1, BS 7435-2, BS 7461, BS EN 161 and
BS EN 60079-10.