USE OF EXISTING FLUES OR CHIMNEY’S
An existing flue pipe or chimney that has proven to
be satisfactory when used with another solid fuel
appliance can normally be used for this appliance
provided that its construction, condition and
dimensions are acceptable. Flues that have proved
to be unsatisfactory, particularly with regard to
down draught, should not be considered for venting
this appliance until they have been examined and
any faults corrected. If there is any doubt about an
existing chimney a smoke test should be carried
out.
Before connecting this appliance to a chimney or
flue pipe which has previously been used with
another flue, the chimney or flue pipe should be
thoroughly swept.
When a chimney is not to be lined a suitable void
should be provided at the base to contain any
debris which may fall from the inside wall, so as to
prevent the debris from obstructing the appliance
flue outlet. (Removal of debris should be facilitated
by the provision of an access door).
VENTILATION
&
COMBUSTION
AIR
REQUIREMENTS
It is imperative that there is sufficient air supply to
the cooker in order to support correct combustion.
The air supply to this appliance must comply with
B.S. 8303: Part 1.
A permanent air entry or opening with a total free
area of at least 550mm
2
per kW of rated output
above 5kW shall be provided but in no case less
than 6500mm
2
. Where a flue draught stabiliser is
used the total free area should be increased by
300mm
2
for each kW of rated output as per Building
Regulations Part J.
If there is another appliance using air fitted in the
same or adjacent room, it will be necessary to
calculate additional air supply.
All materials used in the manufacture of air vents
should be such that the vent is dimensionally stable
and corrosion resistant.
The effective free 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.
Air vents direct to the outside of the building should
be located so that any air current produced will not
pass through normally occupied areas of the room.
An air vent outside the building should not be
located less than the dimensions specified within
the Building Regulations from any part of any flue
terminal. These air vents must also be fire proofed
as per Building Regulations.
Air vents in internal walls should not communicate
with bedsits, toilets, bathrooms or rooms containing
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.
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 air 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.
Where such a 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.
TOP & REAR OUTLET
Fig.11
Flue
collar
to
be
connected to top or rear
exit of bonnet ONLY
.
Seal joint between back
outlet spigot (item 4)
and bonnet (item 1) with
fire cement.
8
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