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For external flues, the termination point must be po-
sitioned 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.13),
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 provide
an additional air supply to the flue whenever the flue's
negative pressure reaches its upper limit and so pre-
vents the negative pressure in the stove rising above
its optimum level. The flue stabiliser should be ad-
justed to give a maximum draught to 12 pascals.
Fig.13
NOTE: The flue stabiliser must have access to an
adequate air supply at all times.
Fig.12
VENTILATION & COMBUSTION AIR
REQUIREMENTS
It is imperative that there is sufficient air supply to sup-
port 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 adjacent
rooms to where this stove is installed, additional air
vents must be provided to prevent the performance
of the stove being affected when the fan/s are running
at their maximum setting with all external doors and
windows closed.
We recommend that air supply to extract fan/s be lo-
cated where it can serve the fan/s, without the air sup-
ply passing through the area where the appliance is
installed.
The room containing the stove should have a perma-
nent ventilation opening of free area at least 550mm
for each kW of rated output above 5 kW, but in no
case less than 6,500mm
All materials used in the manufacture of air vents
should be such that the vent is dimensionally stable
and corrosion resistant.
The effective area of any vent should be ascertained
before installation. The effect of any screen should
be allowed for when determining the effective free
area of any vent. The air vents must be satisfactorily
fire proofed as per Building Regulations. Joints be-
tween air vents and outside walls should be sealed to
prevent the ingress of moisture. Existing air vents
should be of correct size and unobstructed for the ap-
pliance in use. Air vents in internal walls should not
communicate with toilets, bathrooms or rooms con-
taining a shower. Air vents traversing cavity walls
should include a continuous duct across the cavity.
The duct should be installed in such a manner as not
to impair the weather resistance of the cavity.
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