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1. The horizontal flue section exiting the stove
must not exceed 300mm (12").
2. A soot collection box should be fitted below the
lowest point of the flue system, so as to prevent
the build up of soot from inhibiting the flow of
flue gas products from the stove. The collec-
tion box should be fitted with a cleaning door
that is accessible at all times.
3. The flue pipe should be of 125mm (5") diame-
ter rigid insulated stainless steel pipe, that con-
forms to B.S. 4543 and B.S. 5410.
4. The flue pipe should be clamped to the outside
wall at intervals not greater than 1 meter with the
top clamp at the highest possible fixing point
underneath the roof.
o
5. Two 135
bend flue sections must be used to
clear the roof.
6. A suitable flue terminal, such as an OH cowl,
should be fitted to the flue termination point.
FLUE TERMINATION HEIGHT
The flue termination must be high enough (4.6
metres / 15 feet minimum height) to allow the flue
gases to vent into clear air, away from turbulence
that may be caused by roof structures, other chim-
ney stacks, trees etc.
Fig.10 shows the positions for the flue terminations
for both internal and external flues (as per the
Building Regulations). For an internal flue or chim-
ney, the termination point should be not less than
600mm higher than the highest point of the roof or
where the termination point is greater than 600mm
from the highest point of the roof, it must not be less
than 1 meter above the roof.
For external flues, the termination point must be
positioned such that its adjacent point on the roof is
not less than 2300mm from it.
FLUE STABILISER
The stove is fitted with a flue stabiliser (See Fig.11),
which will help to ensure a stable draught is main-
tained through the stove when the flue is subjected
to a varying flue draught. It works by opening to pro-
vide an additional air supply to the flue whenever the
flue's negative pressure reaches its upper limit and
so prevents the negative pressure in the stove rising
above its optimum level.
Fig.11
NOTE: The flue stabiliser must have access to an
Fig.10
adequate air supply at all times.
VENTILATION & COMBUSTION AIR
REQUIREMENTS
It is imperative that there is sufficient air supply to
support proper combustion. The air supply to the
stove must comply with B.S. 5410: Part 1 and the
relevant sections of the OFTEC Technical Book
No.3.
If there is an air extraction fan/s, tumble dryer or any
other air using appliance fitted in the room or adja-
cent rooms to where this stove is installed, addition-
al air vents must be provided to prevent the perfor-
mance of the stove being affected when the fan/s
are running at their maximum setting with all exter-
nal doors and windows closed.
We recommend that air supply to extract fan/s be
located where it can serve the fan/s, without the air
supply passing through the area where the appli-
ance is installed.
The room containing the stove should have a per-
manent ventilation opening of free area at least
2
550mm
for each kW of rated output above 5 kW.
8
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