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29
VENTILATION
Many older buildings are sufficiently ventilated by natural leakage
of air to provide suitable air supply for an appliance of 5kW output
or less.
Modern building techniques have reduced the amount of air that
leaks in or out of a house. A modern construction with an air
tightness of less than 5m3 per hour per m2 requires an air vent for
ALL solid fuel appliances including those with a rated heat output
of less than 5kW.
NOTE: The air leakage of a modern house is tested at the
completion of construction and a certificate issued confirming this.
This appliance requires a constant supply of air to maintain proper
combustion and effective flue performance.
An inadequate air supply can result in poor combustion and smoke
entering the room which is potentially dangerous.
This supply of air can come from either:
— Purpose provided ventilation.
— Some Stovax appliances can also be fitted with an optional
outdoor air kit which allows air to be drawn in from the outside.
The amount of air required must comply with local building
regulations and the rules in force.
If vents open into adjoining rooms or spaces there must be an air
vent of at least the same size direct to the outside.
Site the vents where cold draught is unlikely to cause discomfort.
This can be avoided by placing vents near ceilings or close to the
appliance (See diagram).
Extractor fans, cooker hoods and other heating devices placed in
the same room or space as the appliance, may cause problems.
Extra ventilation must be installed as per each appliance
requirements.
The appliance shall not be installed with ventilating systems which
have pressure below -15Pa.
Increase air supply provisions where a room contains multiple
appliances.
If any checks reveal problems do not proceed with the fitting
of the appliance until they have been rectified.
Well ventilated
roof space
Living room
(example)
Hall
Well ventilated space
Suspended floor
Combustion
appliance
BUILDERS OPENING
Many fireplace openings have a supporting lintel. Remove
the covering plaster to identify it's position before starting any
constructive work. Do not remove constructional lintels without
making provision to support the remaining structure of the building.
The appliance must not form any part of the supporting structure.
The chimney/flue must have a sealed connection to the appliance
flue spigot.
The structure of the builders opening will reach high temperatures.
Use insulating blockwork to reduce the heat transfer to the external
walls.
Take care when finishing the chimney breast and surrounding area.
The conducted and convected heat emitted by the appliance could
be high enough to crack normal plaster. Use a high temperature
plaster, or face the area with a suitable non combustible board
avoiding any joints above the appliance. New plaster should be
fully dried before the appliance is used, or cracking could occur.
If you are in any doubt about your ability to produce a safe opening
contact your Stovax dealer for professional advice.
FIRE SURROUND CLEARANCES
We recommend you obtain expert advice before proceeding with
work of this nature.
Some finishes may discolour with heat and some lower quality
products may distort, or crack, when in use.
If stone / granite / marble or any other natural material is used to
construct the fire surround, or any part of it, provision should be
made for expansion and movement of the parts due to heating and
cooling.
If you are in any doubt about the installation requirements, or
suitability of fire surrounds contact your Stovax dealer.
All fire surrounds should be suitable for use with solid fuel heating
products.
29


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