4
All chimney installations should comply with Document J of
Building Regulations.
https://www.gov.uk/government/uploads/system/uploads/atta
chment_data/file/468872/ADJ_LOCKED.pdf
The Clearline AKW Chimney requires a 50mm clearance
to combustible material including timber joists stud walls,
plasterboard and plywood. On condensing flue systems, where
seals are fitted, the clearance to combustible material is
reduced to 20mm.
Clearline AKW is an open-ended system, each component
secured with a locking band which is included with every
component with a female connection.
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 50mm 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).
