23
Design, Installation & Assembly
Frequently Asked Questions
stack in the case of the pot hanger terminals, or above the top plate and clamp to ensure a
positive location within the relevant terminal, and cut. This should be done by using an industrial
knife or metal snips. At all times extreme care must be taken when cutting the liner and strong
industrial gloves plus long sleeved overalls should be worn as cut edges are very sharp. In
addition, any tape secured to the ends of the liner, which is provided for safe handling prior to
installation, must be removed before completion, and commissioning of the full system.
IS THERE A CORRECT ‘WAY UP’ TO INSTALL THE FLUE LINER?
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Yes, on TecnoFlex Plus multifuel Iiner; the directional arrow on the outside of the liner
indicates the direction of flue gases, and this must be pointing upwards towards termination.
•
Triplelock Flex can be installed either way up.
HOW SHOULD THE TERMINAL BE CONNECTED TO THE FLUE LINER AND HOW IS
THE INSTALLATION MADE WEATHERPROOF?
For gas and oil systems, the terminal should be fitted over the protruding end of the liner,
ensuring that the flex does not protrude beyond the stop bead in the terminal, and riveted
or secured using self tapping screws. On TecnoFlex Plus, where used on solid fuel appliances,
either a proprietary chimney pot must be fitted by bedding the pot on to the top plate or, whilst
technically an open terminal provides the least possible resistance to the flue gases, in order
to prevent excessive rain ingress, a raincap or combined pot hanger and terminal may be used.
Only 316L material is used on Schiedel’s terminals including raincaps, pot hangers and combined
pot hanger and terminal to provide the highest corrosion resistance. In all cases, the top of the
stack should then be weathered and sealed using a suitable acid resistant mortar to prevent
ingress of water.
ARE THERE ANY SPECIAL REQUIREMENTS FOR PROVIDING COMBUSTION
VENTILATION?
It is very important that sufficient air for combustion is provided to the room containing the
appliance, to enable correct and efficient working of the system. Reference should be made to
the appliance manufacturer’s instructions and recommendations are also given in the Building
Regulations Document J.
DOES AN EXISTING CHIMNEY NEED RELINING WHEN FITTING A GASFIRE INTO A
FIREPLACE OPENING?
Building Regulations Document J, outlines different requirements for relining masonry chimneys
built before and after 1st February 1966. This can be summarised in the following table to
provide guidance in the correct method of installing Schiedel Chimney Systems flue liners into
these chimney types. The liner must be sized to meet the requirements of the new appliance,
please refer to the flue size selection guide and the appliance manufacturer’s instructions. A
lined chimney is defined as one which is fitted with a clay or concrete liner within the flueway,
complying with Document J.
