KAL-FIRE Fera 105, Инструкция по установке и эксплуатации, Страница: 6 / 27

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The MAXIMUM vertical system length must be less than 12 m (< 12
m!). If it is desirable to mount part of the flue horizontally, the 12-
metre vertical system length can be converted to the horizontal.
Horizontal elements create considerable resistance, which is 1.5 times
greater than in the case of a vertical element.
• 1 metre horizontally = 1.5 vertically.
• A maximum of ½ of the system may run horizontally.
The same method of calculation applies to bends:
• 45° bend = 1.5 m
• 90° bend = 2 m
• Wall/roof duct = 1.5 m
Calculation example:
For a Fera connected to a concentric flue, the calculation example is
as follows:
The first metre (0,7) must be vertical (always), then a 90° bend to
the rear, then 50 cm horizontally, then another 90° bend upwards.
The flue then extends for 1 metre upwards to a roof duct.
• 1 metre vertical = 1 metre
• 90° bend = 2 metres
• 0.5 metres horizontal = 0.5*1.5 = 0.75 metres
• 90° bend = 2 metres
• 1 metre vertical = 1 metre
• Roof duct = 1.5
Total length = 8.25 metres
As this is less than 12 metres, the appliance will function. It must be
expressly pointed out that the length must be kept to a minimum in
order to produce the best flames.
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1.4 Restrictor plate
In some installation chimney draught may be stronger than strictly
necessary. In these circumstances it is desirable to restrict draught in
order to achieve a calmer and higher flame movement. This can be
adjusted by using a restrictor plate.
Use the following chart to find out which position of the restrictor plate
we recommend to achieve the best possible flame movement.
1
2 3
4 5
6 7
8 9
10
R1
0%
20%
40%
60%
80%
100%
length flue duct
Restrictor plate
restriction