3
Design Guide
MANDATORY REQUIREMENTS
Building Regulations Document J requires that a flexible flue liner can only be installed
completely enclosed inside a masonry chimney. A non masonry enclosure such as timber or
plasterboard boxing in is not acceptable.
The type of flue liner permitted depends on the fuel to be used, the type of appliance and the
type and year of chimney construction in which it is to be fitted.
Building Regulations Document J, outlines different requirements for relining masonry chimneys
built before and after 1st February 1966. This is summarised in the table below.
Connection to an appliance which is not connected to the fuel supply, should be carried out
by a competent person. We recommend the use of HETAS approved installers for solid fuel
applications. If installation is carried out by a non HETAS registered installer, the installation
must be certified by a local Building Control inspector.
Connection to an appliance that is
connected to the fuel supply must be carried out by a Gas Safe (Gas) or OFTEC (Oil) registered
installer.
The design guide must be read in conjunction with the detailed component installation
instructions.
For full design and installation details the key referral documents are:
•
BS EN 1856-2: Connecting Flue Pipes
•
BS EN 1856-2: Flue Liners
•
BS EN 1859: Metal Chimneys - Testing Methods
•
BS EN 1443: Chimneys - General Requirements
•
BS EN 15287-1: Chimneys. Design, installation and commissioning of chimneys. Chimneys for
non-room sealed heating appliances.
•
Approved Document J: - Combustion appliances and fuel storage systems (England & Wales)
•
DFP Technical Booklet L: - Combustion appliances and fuel storage systems (NI)
•
Technical Handbook (Domestic & Non Domestic),Section 3 - Environment (Scotland)
•
Appliance Installation Instructions and related standards. Other standards covering specific
applications will also be relevant and must be adhered to.
Ensure all chimney components are available and check them to ensure there has been no
damage. Do not use damaged components.
Appliance
Chimneys built before 1.2.1966
Chimneys built after 1.2.1966
Gas Burning
Output up to 45kW
Triplelock can be used in unlined
chimney on dry applications.
Triplelock can be used in lined
chimney on dry applications.
Kerosene Burning
Output up to 45kW
Triplelock can be used in unlined
chimney on dry applications.
Triplelock can be used in lined
chimney on dry applications.
Gas/Oil Burning
Output up to 45kW
TecnoFlex Plus can be used in
unlined chimney on wet and dry
applications.
TecnoFlex Plus can be used in
lined chimney on wet and dry
applications.
Solid Fuel Burning
Output up to 45kW
TecnoFlex Plus can be used in
unlined chimney.
TecnoFlex Plus can be used in
lined chimney.
