Kalfire W60/51Fl Installation And Instructions Manual page 22

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 different 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 difficult 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.
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fsch flue section in cm
fso surface of firebox in cm
Hsch 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:
e 0.2 with a perfect flue, straight above the Kalfire; 0.6 with connection
less than 45°.
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