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4
Preparation
The upcoming sections provide preparatory
information prior to installation of the gas fire:
Preliminary work with the help of a scale
−
drawing
Chimney calculation
−
Check the gas fire
−
Check UTP connection and/or WiFi signal
−
4.1
Preliminary work with the help of
a scale drawing
You can use to your advantage a scale drawing
prior to and during the placing of the
concentric flue duct system and the gas fire.
Scale drawings are available on the
http://www.kalfire.com/en/ fireplaces website.
Select the correct gas fire type here. Once you
have made your choice, a page will open on
which you will find "technical information".
The subject "documents" with the scale
drawing of the gas fire can be found there too.
4.2
Chimney calculation
Calculate the concentric flue duct system with
the values of the chimney calculation or make a
choice from the configurations in the
appendices. See: flue duct configurations 1
through 6, paragraph 8.1.
Table 1: Calculation values chimney calculation
Components
First vertical metre
Second metre and subsequent
vertical metres
metre horizontal pipe
90° vertical elbow (A)
45° vertical elbow
90° horizontal elbow (B)
45° horizontal elbow
Example of chimney calculation
Used parts
1x 1st vertical metre
1x 2nd vertical metre
2x metre horizontal pipe
2x 90° vertical elbow (A)
1x 90° horizontal elbow (B)
Result: 9 + 1 - 2 - 4 - 4 = 0. (This chimney calculation is not acceptable, it must be at least 0.5)
A chimney calculation is made for the roof
pass-through and the wall pass-through. The
chimney calculation is suitable for gas types
G20, G25, G30 and G31. Kalfire cannot
guarantee proper operation of the fireplace if
your configuration does not comply to the
chimney calculation.
CAREFUL!
Many elbows and/or horizontally-mounted
components of the flue duct can create
substantial resistance. The flame pattern can
vary considerably because the combustion air
cannot easily reach the gas fire.
Figure 3: Flue duct components
Maximum permitted
Kalfire Gi
11 meter
5 meter
3 units
6 units
2 units
4 units
Calculation Value
+9
+1
-2
-4
-4
13
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