4
The chimney can be checked, before the stove is installed, with a smoke match. If the chimney doesn’t pull
the smoke it may suggest the chimney needs attention (see the Flue Diagnosis Table, below).
The flue draught test hole must be drilled in the flue pipe as close to the stove as possible and before any
flue draught stabiliser.
FLUE DRAUGHT
Measurements
Fig.2 – Chimney and Flue Performance
This test is only a guide as an apparently poor flue may improve once the stove is
installed, lit and the flue is warmed. If, once the stove is installed, there is any doubt that
the chimney is providing an adequate draught, reading can be taken with the stove llit.
Two flue draught readings should be taken, one with the stove at minimum rate and one at
maximum rate.
5
FLUE STABILISER
The stove should be lit and allowed to warm the flue thoroughly. The air controls can then be set so that the
stove burns on a low setting. Allow the burning rate to become steady. The flue draught reading should now
be taken with the primary air intake closed and the airwash control fully open.
The primary air intake can now be opened to allow the stove to burn at maximum rate. Give the stove some
time for the burning rate to become steady and then close the primary air intake, make sure the airwash
control is fully open and take a flue draught reading immediately.
Ideally, the flue draught reading should range between 1mm wg (10 Pa) and 2.5mm wg (25 Pa). Any
readings significantly outside this range may indicate the need for remedial action.
Low flue draught symptoms:
Low flue draught symptoms:
Low flue draught symptoms:
Low flue draught symptoms: difficult to light and smoke coming into the room.
CAUSE
CAUSE
CAUSE
CAUSE
REMEDY
REMEDY
REMEDY
REMEDY
Cold chimney
Line the chimney
Chimney too short
Extend the chimney
Down draught
Relocate/extend chimney terminal. Fit an anti down draught cowl
Chimney diameter too large
Line the chimney
Chimney obstruction
Clear/sweep the chimney
Restricted air supply
Check for competing draughts (other chimneys, extractor hoods/fans).
Fit an air vent if the room Is sealed.
High flue draught symptoms:
High flue draught symptoms:
High flue draught symptoms:
High flue draught symptoms: fire difficult to control, fuel will not last, stove too hot, stove damage, chimney fire.
CAUSE
CAUSE
CAUSE
CAUSE
REMEDY
REMEDY
REMEDY
REMEDY
External wind conditions
combined with chimney terminal
Fit stabiliser cowl.
Fit flue draught stabiliser.
A flue stabiliser can be fitted to reduce the draught through the stove if the flue draught is too high. The flue
stabiliser should be:
•
Fitted in the same room as the stove
•
The same size as the flue pipe
•
Fitted no closer than 700mm to the flue outlet of the appliance.
Secure the 4 legs to the underside of the base of the stove with the 4 bolts supplied (Fig.4).
The overall dimensions of the stove are shown in Fig. 3. The table above indicates recommended distances
between the stove and surrounding combustible materials. As a rule, any surrounding combustible material
should not exceed 80 ºC. There should be sufficient space around the stove for service work.
The construction of the hearth must conform to Building Regulations, must be firm, non-combustible and
capable of supporting the stove. (Refer to Building Regulations Document J).
Minimum
Maximum
INSTALLING THE STOVE
Positioning
Hearth
