Operating instructions

4
For the top flue outlet configuration, remove the
blanking plate from the hob, remove the flue spigot
from the back plate and fix it to the hob. Fix the out-
let blanking plate to back plate (see Fig.2). Push the
flue outlet connector pipe (not supplied) into the flue
spigot and cement into place using approved fire
cement, ensuring that no fire cement is blocking the
flue passageway.
REAR FLUE EXIT
Push the flue connector pipe (not supplied) into the
flue spigot and cement into place using approved
fire cement ensuring that no cement is blocking the
flue passageway.
Fig.3
Pitched roof not exceeding 45
o
showing external and
internal flues and ridge termination
DOWN DRAUGHTS
However well designed, constructed and positioned,
the satisfactory performance of the flue can be
adversely affected by down draught caused by near-
by hills, adjacent tall buildings or trees. These can
deflect wind to blow directly down the flue or create
a zone of low pressure over the terminal. A suitable
anti-down draught terminal or cowl will usually effec-
tively combat direct down blow but no cowl is likely
to prevent down draught due to a low pressure zone
(See Fig.4)
Direction of wind
Direction of wind
Direction of wind
Pressure zone
Pressure zone
Suction zone
Suction zone
Pressure zone
Suction zone
Fig.4
VENTILATION AND COMBUSTION AIR
REQUIREMENTS
This appliance is rated at 6.6kw and requires a free
air vent of 8.8cm
2
. If a flue draught stabiliser is fit-
ted the air requirement is 28.6cm
2
. When calculat-
ing combustion air requirements for this appliance
use the following equation: 550mm
2
per each kW of
rated output above 5 kW should be provided, where
a flue draught stabiliser is used the total free area
shall be increased by 300mm
2
for each kW of rated
output. If there is another appliance using air fitted
in the same or adjacent room, it will be necessary to
provide an additional air supply.
For newer build properties the ventilation require-
ments may need to be higher if the designed per-
meability of the home is less than 5m
3
/h.m
2
.
Approved Document J of the building regulations
gives more detailed information.
All materials used in the manufacture of air vents
should be such that the vent is dimensionally stable,
corrosion resistant, and no provision for closure.
The effective free area of any vent should be ascer-