10
Joints between air vents and outside walls should be
sealed to prevent the ingress of moisture. Existing
air vents should be of the correct size and
unobstructed for the appliance in use. If there is an
extraction fan fitted in the room or adjacent rooms
where this appliance is fitted, additional air vents will
be required to eleviate the possibility of spillage of
products of combustion from the appliance/flue while
the fan is in operation. (Refer to B.S. 5410 Part 1).
Where such an installation exists, a test for spillage
should be made with the fan or fans and other
appliances using air in operation at full rate, (i.e.
extraction fans, tumble dryers) with all external doors
and windows closed.
If spillage occurs following the above operation, an
additional air vent of sufficient size to prevent this
occurrence should be installed.
OUTSIDE AIR CONNECTION
This appliance may be connected direct to the
outside of the house for its combustion air
supply.
1. If this option is used additional combustion air is
not required, as indicated in B.S. 5410 Part 1.
2. Remove the blanking plate located at the back of
the cooker and remove the primary air grill
located at the front of the cooker base. Fix solid
blanking plate over the front of the base (See fig.
8a & 8c) The primary air grill may be
disregarded.
3. Connect the optional 125mm (5”) spigot to the
rear, see fig. 8b.
4. To connect this cooker to an outside air supply
use 125mm (5”) kit to order. (See fig. 8b).
5. Air inlets 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. This
duct must also be satisfactorily fire proofed as
per Building Regulations.
6. Joints between air vents and outside walls
should be sealed to prevent ingress of moisture.
DOWN DRAUGHTS
However well designed, constructed and positioned,
the satisfactory performance of the flue can be
adversely affected by down draught caused by
nearby hills, adjacent tall buildings or trees. These
can deflect wind to blow directly down the flue or
create a zone of high pressure over the terminal.
A suitable anti-down draught terminal or cowl will
usually effectively combat direct down blow but no
cowl is likely to prevent down blow due to a high
pressure zone. (See figs 9 & 10). Ensure that any
cowl used will not restrict the flue exit, or cause
excessive back pressure.
FACTORY-MADE INSULATED CHIMNEYS
Factory-made insulated chimneys should be
constructed and tested to meet the relevant
standards and recommendations given in:
* B.S. 7566 – Installation of factory-made chimneys
conforming to B.S. 4543 for domestic appliances.
Part 1: Method of specifying installations design
information.
Part 2: Specification for installation design.
Part 3: Specification for site installation.
Part 4: Recommendation for installation design
and installation.
Fig.8a
Air Inlet Blanking
Plate
Fig.8c
Fig.8b
Outside duct
assembly (to
order) Max.
Length
1 meter (3’ 3”)
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