13
Fig 4
Provision must always be made for sweeping the chimney. Cement pipes and fittings must not be used within 2m of the
stove outlet. Plain pipe chimneys are not recommended, but propriety makes of insulated chimneys may be suitable;
refer to manufacturers' guidance.
CO Alarms
Building regulations require that whenever a new or replacement fixed solid fuel or wood biomass appliance is installed
in a dwelling a carbon monoxide alarm must be fitted in the same room as the appliance. Further guidance on the
installation of the carbon monoxide alarm is available in BS EN 50292 :2002 and from the alarm manufacturer’s
instructions
. Provision of an alarm must not be considered a substitute for either installing the appliance
correctly or ensuring regular servicing and maintenance of the appliance and chimney system
Air supply
A permanent, unobstructed air vent is required. It must communicate directly with the outside or an adjacent room which
itself has a permanent air vent. The vent must have a minimum effective area of 550mm
2
per kW of rated output above
5kW. Position the vent in a place not liable to accidental blockage.
Extractor fans
If an extractor fan is located close by, it could affect the stove's performance. The supply of air should be such that the
operation of the stove and chimney are unaffected when the extractor fan is running. A separate air supply may be
required.
A flue draught interference test will determine whether the extractor fan is having an effect. Where the fan is in the same
room as the appliance, close all windows and doors. Where the fan is in an adjacent room, close all external doors and
windows, but leave the internal doors open. Set the extractor fan to full capacity; after the fan has established its normal
airflow pattern, perform combustion analyses of the stove at minimum and maximum outputs. Perform similar tests while
the fan is switched off.
