22
Design, Installation & Assembly
Frequently Asked Questions
CAN ANYONE INSTALL FLUE LINER?
Connection to an appliance which is not connected to the fuel supply, should be carried out
by a competent person. However, connection to an appliance that is connected to the fuel
supply must be carried out by a GAS SAFE (for gas) or OFTEC (for oil) registered installer.
We recommend the use of HETAS approved installers for solid fuel applications. If a non
HETAS approved installer is used, then the installation must be signed off by a Building Control
Inspector prior to being used.
ARE THERE ANY SPECIAL TOOLS OR EQUIPMENT REQUIRED?
No. The following would be necessary:- suitable cutting equipment, screwdriver, and adjustable
spanner. To weather the top of the chimney stack and seal, a trowel with some sand and cement
will be required. A closure plate would need to be fitted at the bottom of the system using
appropriate fixings.
CAN FLUE LINER BE INSTALLED ANYWHERE?
No. Flue liner
must
only be installed inside a masonry brick chimney, as defined in the table on
page 2 depending on the type and year of chimney construction.
ARE ANY OTHER MATERIALS REQUIRED?
The connection to the appliance should be made using a high temperature sealant and/or glass
rope to ensure a positive seal. Where TecnoFlex Plus is to be fitted to the top of an open fire
place, a Schiedel Chimney Systems gather unit should be fitted into the throat of the chimney
connected to the TecnoFlex Plus and sealed off.
THE CHIMNEY HAS BEEN PREVIOUSLY USED FOR AN OPEN SOLID FUEL FIRE,
can a flue liner be installed straight away?
No, in all cases, the chimney must be inspected for deterioration and if necessary, any remedial
work required must be carried out. The chimney should be swept, preferably by a member of
NACS (National Association of Chimney Sweeps) or a suitably qualified chimney sweep who
would provide a certificate after sweeping and checking, which should be retained for future
reference. A list of HETAS registered chimney sweeps can be found at www.hetas.co.uk
HOW IS THE LINER SUPPORTED?
Triplelock Flex is relatively light so it can be supported at the top of the chimney by using a
clamp plate, which should be fixed to the top of the masonry stack. TecnoFlex Plus however,
is heavier and would be supported either by using a separate plate and clamp, which would
be securely fixed to the top of the stack, or using a suitable pot hanger - see p.5 for more
details. Where a tee is used at the base of the system to provide a drain point/cleaning access
or connection to a flue pipe from the appliance, a bottom support bracket would be required,
fixed to the inside of the stack.
HOW IS THE LINER CUT TO THE CORRECT LENGTH FOR THE CHIMNEY?
After the length of flue liner has been connected to the appliance, fluebox spigot or to the flue
pipe connecting to the appliance, allow sufficient liner to protrude at the top of the chimney
