JINECI08 RevC 21/05/14
The diameter of the flue should not be less
than 150mm and not more than 200mm.
If these requirements are not met the chimney
should be lined by a suitable method.
If there is no existing chimney then either a
prefabricated block chimney in accordance
with Building Regulations Approved Document
J or a twin-walled insulated stainless steel flue
to BS EN 1856 can be used. These chimneys
must be fitted in accordance with the
manufacturer’s instructions and Building
Regulations.
Table 1
– Minimum Flue Designations
The chimney/flue should have a vertical height
of at least 4.5 metres and should terminate in
accordance with Table 2.
If the chimney is believed to have previously
served an open fire installation, it is possible
that the higher flue gas temperature from the
stove may loosen deposits that were previously
firmly adhered, with the consequent risk of
flue blockage. It is therefore recommended
that the chimney is swept a second time within
a month of regular use after installation.
If you have any doubts about the suitability of
your chimney, consult your local
dealer/stockist.
Both the chimney and flue pipe must be
accessible for cleaning and if ANY part of the
chimney cannot be reached through the stove
(with baffle removed), a soot door must be
fitted in a suitable position
.
F
LUE
D
RAUGHT
If the draught exceeds the recommended
maximum, a draught stabiliser must be fitted
so that the rate of burning can be controlled
and to prevent over firing.
If the reading is less than the recommended
minimum then the performance of the
appliance will be compromised.
The flue draught should be checked under fire
at high output.
Minimum Draught – 1.2mm Water Gauge
Maximum Draught – 2.5mm Water Gauge
Flue Type
Minimum Designation
Masonry or flue block flue
with liner
T400 N2 D3 G
(BS EN 1443:2003)
Clay Flue Blocks
FB1 N2
(BS EN 1806:2006)
Clay/Ceramic Liners
B1 N2
(BS EN 1457:2009)
Concrete Liners
B2
(BS EN 1857:2003)
Factory Made Metal
Chimney
T400 N2 D3 G
(BS EN 1856-1:2003)
Terminal
Position
Clearances to Flue
Outlet
a
At or within 600mm of
the ridge
At least 600m above the ridge
b
Elsewhere on a roof
(whether pitched or
flat)
At least 2300mm horizontally
from the nearest point on the
weather surface and:
a)
At least 1000mm above the
highest point of intersection of
the chimney and the weather
surface or
b)
At least as high as the ridge
c
Below (on a pitched
roof) or within
2300mm horizontally
to an openable roof
light, dormer window
or other opening.
At least 1000mm above the top
of the opening.
d
Within 2300mm of an
adjoining or adjacent
building, whether or
not beyond the
boundary.
At least 600mm above any part
of the adjacent building within
2300mm
Table 2
– Flue Terminal Positions
