Down Draughts; Ventilation & Combustion Air Requirements - Stanley Cara Installation And Operating Instructions Manual

4. Bottom Baffle
Lay the baffle into the stove so the edge with corners
removed is to the front. Lift the front edge of the baf-
fle on top of the cross pipe, then lay the rear edge on
the support on the back of the boiler. See Fig.9.
A
Support
C
5. Fire Fence
Lay the fire fence into the slots provided ensuring
that they slope from front to back so that no embers
can fall out through the fire fence.

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.10)
Fig.9
B
d
Fig 10
Direction of wind
Pressure zone
Direction of wind
Pressure zone
Direction of wind
Pressure zone
VENTILATION ANd COMBUSTION AIR
REQUIREMENTS
It is imperative that there is sufficient air supply to
support correct combustion. The minimum effective
air requirement for this appliance is 5.5cm
calculating combustion air requirements for this
appliance use the following equation: 550mm
each kW of rated output above 5 kW should be pro-
vided, where a flue draught stabiliser is used the
total free area shall be increased by 300mm
each kW of rated output. If there is another appli-
ance using air fitted in the same or adjacent room, it
will be necessary to provide an additional air supply.
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-
tained before installation. The effect of any grills
should be allowed for when determining the effective
free area of any vent.
Air vents direct to the outside of the building should
be located so that any air current produced will not
8
Suction zone
Suction zone
Suction zone
2
. When
2
per
2
for