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If you do not want to use the flue diameters listed in Table 3,
you can use the formula below to calculate a potentially smaller
diameter.
Permitted reduction:
•
Flue Ø150 Reduction not allowed.
•
Flue Ø180 Maximum reduction of 30 mm. Reduction not
allowed for the Kalfire W65/38C.
•
Flue Ø200 Maximum reduction of 20 mm. Reduction not
allowed for the Kalfire W53/50R, W66/48S and W80/52T.
•
Flue Ø250 Maximum reduction of 50 mm.
WARNING After reducing the flue, it is no longer possible to
use the models suitable for this as an open fireplace (Kalfire
W60/51F, W71/62F, W85/40F) Reduction is permitted
immediately behind the damper/connecting collar, but not
any deeper into the flue. In case of doubt, always use the
connection diameter indicated on the fireplace.
Avoid horizontal runs; one extension may be placed with
adjustable elbows with a maximum change of direction of
45°. Apply it directly to the appliance.
Kalfire advises you to insulate the flue; this will reduce the
risk of the smoke condensing and will improve the draught.
Use the Kalfire stainless steel double-walled flue duct for
this purpose.
Kalfire advises you not to use larger flue diameters than
the connection present on the Kalfire. Using a larger flue
diameter can result in the following problems:
- Too fast and uncontrolled combustion
- Irregular flames;
- Reduced heat output.
Use a draught hood if there is a flue with a (too) strong
draught that can cause quick, uncontrolled combustion and
irregular flames.
Use of dierent flue diameters to those indicated, is entirely
for the risk of the installer; when the door is opened, smoke
may escape back into the room or it may be more dicult to
ignite the fireplace.
Take factors in the surrounding environment into account
that could cause a strong draught in the flue. For example,
frequent high winds, which require a damper to be
mounted.
•
Pay attention that it is also possible to sweep the chimney
in the connection piece.
Fsch
Fso
Hsch
e
Flue section in cm
2
Surface of firebox in cm
2
Height of flue in metres measured from the upper side of the Kalfire.
Influence factor between 0.2 and 0.6 determined by the flue quality:
0.2 with a perfect flue, straight above the Kalfire; 0.6 with connection
less than 45°.
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