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200-XK-I06-201217
FLUE DRAUGHT
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).
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; a
flue draught reading can be taken with the stove lit. Two flue draught
readings should be taken, one with the stove at minimum rate and one at
maximum rate.
MEASUREMENTS
The flue draught test hole is located on the right hand side of the stove at the back near
the top. Remove the screw to allow reading to be taken, replace the screw once
readings are complete.
MINIMUM
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.
MAXIMUM
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:
difficult to light and smoke coming into the room.
CAUSE
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:
fire difficult to control, fuel will not last, stove too hot, stove damage, chimney fire.
CAUSE
REMEDY
External wind conditions combined with
chimney terminal
Fit stabiliser cowl.
Fit flue draught stabiliser.