4
Clearline AKC is an open-ended system, each component
secured with a locking band which is included with flue lengths
and elbows.
There should be no more than 4 bends in a system. (A 90°
Tee on the back of the stove counts as 2 bends). If four bends
are used there should be sweeping access between the two
offsets.
There should be no flue joins between a floor or ceiling joists
or rafters, with at least 150mm twin-wall flue projecting below
and above before an additional connection with twin wall.
The flue must not go more than 45° off vertical.
The minimum recommended height from top of stove to
termination is 4.5metres, however many stoves will run on a
shorter flue.
The minimum flue size for non defra approved stoves is
150mm.
The flue size must NEVER be smaller than the appliance
outlet, unless approved by stove manufacturer.
Flue needs to switch from single skin to twin wall at 425mm
below a ceiling.
Where the chimney passes through any part of the building,
(with the exception of the room where the appliance is
installed), where there is a risk of accidental human contact,
i.e a bedroom etc., or where there is a risk of contact with
combustible materials, the chimney must be enclosed in an
appropriate way to meet Building Regulations. This can be
achieved by boxing-in the chimney, or by the use of a
protective wire mesh frame in roof spaces etc. The minimum
distance of 60mm to any combustible material, including loft
insulation should always be observed and any enclosure
should be ventilated using the appropriate ventilated fire
stops.
Twin wall should also be boxed-in in attic spaces. This can be
achieved with wire mesh to a minimum of 1200mm in height.
Single skin flue should be 3 times its diameter from
combustible material if not heat shielded. (i.e. 150mm pipe
should be 450mm from combustible materials).
It is recommended that the maximum horizontal offset should
not exceed 20% of the total length of the chimney.
All offsets should be supported above and below with the
appropriate support component i.e. ceiling, joist, wall or roof
support.
