5
Figure 5
Figure 6
The flue pipe must be up to 6 m long with a diameter of 100mm up to the entrance to the chimney. After that, the diameter
of the flue pipe must be increased to 130-150mm. Each knee means a 1 m shorter pipe. Thus, for example, if we have three
curves of 100mm – diameter they change the length of 100-mm-diameter flue pipes for 3m. You can only put 3m of the straight
pipe up to the chimney to reach a maximum of 6m of 100-mm-diameter flue pipes. After that, it must increase, switch to flue
pipes or enter a chimney with a larger diameter, for example 130 – 150mm.
Make sure that the curve are not at a sharp angle of 90º. They must be under some radius or made from segments. Sharp
curves increase resistance to passing of smoke through the curve.
- Every knee must have a door that can be opened for cleaning.
- The connections between the connecting pipes must be sealed.
- Use an Ø130mm connector for a longer distance. In this case, the length is up to 8m.
INSULATION AND DIAMETER OF THE OPENINGS ON THE ROOF
Once the position of the boiler has been determined, it is necessary to make a hole i.e. an opening the flue pipe should pass
through. This varies depending on the type of installation, diameter of the flue pipe, and the type of the wall or roof the flue pipe
should pass through. The insulation must be made of insulation material (mineral wool) with nominal density higher than 80
kg/m
3
.
The ideal underpressure is primarily dependent on the absence of obstacles such as narrowings and /or angular connections.
Knees are recommended to be at 30 °, 45 ° and 90 °. Knees at 90 ° should be three-fold (Figure 7).
In any case, it is necessary to provide an initial vertical flue pipe extension which is at least 1.5 m long. Only in this way can the
appropriate flue gas discharge be guaranteed.
Figure 7
AISI 316 steel flue with double insulated chamber, material
resistant to 400 ° C. Optimal efficiency 100%
Waterproof flue with double insulated chamber and outer casing
of light concrete. Optimal efficiency 100%
