Ventilation & Combustion Air Requirements; Permanent Air Vent; External Ducted Air - Stanley Lismore Installation And Operating Instructions Manual

Approved Document J (see also combustion air sup-
ply).
Adequate provision e.g. easily accessible soot door
or doors must be provided for sweeping the chimney
and connecting fluepipe.
ALL FLuE INSTALLATIONS ARE THE
RESPONSIBILITY OF THE CuSTOMER.
VENTILATION & COMBuSTION AIR REQuIRE-
MENTS
It is imperative that there is sufficient air supply to
the stove in order to support correct combustion.
The air supply to this appliance must comply with
current Building Regulations. The mimimum effec-
tive air requirement for this appliance is 71.5cm
This increases to 110.5cm
biliser is fitted. If another appliance is fitted in an
adjacent room it will be necessary to calculate 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
pass through normally occupied areas of the room.
An air vent outside the building should not be locat-
ed less than the dimensions specified within the
Building Regulations and B.S. 8303: Part 1 from any
part of any flue terminal. These air vents must also
be satisfactorily fire proofed as per Building
Regulations and B.S. 8303: Part 1.
Air vents in internal walls should not communicate
with bedrooms, 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 unob-
structed for the appliance in use. If there is an
extraction fan fitted in adjacent rooms where this
appliance is fitted, additional air vents may be
required to alleviate the possibility of spillage of
products of combustion from the appliance/flue
while the fan is in operation. Refer to B.S. 8303 Part
1.
2
where a flue draft sta-
Where such an installation exists, a test for spillage
should be made with the fan or fans and other appli-
ances using air in operation at full rate, (i.e.extrac-
tion 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.
Especially Airtight Properties:-
If the stove is being fitted in a property where the
design air permeability is less than 5m
mally newer properties built from 2006), then a per-
manent ventilation must be fitted to provide 550mm
of ventilation for each kW of rated output.
2
.
draught stabiliser is also fitted then the requirement
2
is 850mm per kW of rated output.

PERMANENT AIR VENT

The stove requires a permanent and adequate air
supply in order for it to operate safely and efficiently.
In accordance with current Building Regulations the
installer will have fitted a permanent air supply vent
into the room in which the stove is installed to pro-
vide combustion air. This air vent should not under
any circumstances be shut off or sealed.
Extractor Fan
There must not be an extractor fan fitted in the same
room as the stove as this can cause the stove to
emit smoke and fumes into the room.

EXTERNAL DuCTED AIR

Where required the primary air supply can be
ducted from outside. An aluminium flexible duct is
available to order for connection to the stove.
It is recommended to bring the air supply for the
stove into the house using a 4" plastic pipe. Where
the pipe meets the outside wall make sure a vent
cover is fitted properly to ensure no rodents can
enter via the vent pipe.
The vent pipe should be located to prevent the
ingress of moisture and in a location where it will not
get blocked with leaves or any other debris. As wind
effects can create suction and pressure zones of
opposite sides of the dwelling it is recommended to
run the air vent from opposite poles (North, South,
East & West) of the dwelling and tee off for the air
supply to the stove. This should negate the effect
of suction and pressure zones. See Fig.4
6
3 2
/ (h.m ) (nor-
2
If a