LAMINOX Idro TERMOBOILER Mini Series Instructions For Installation, Use And Maintenance Manual page 17

4.5.3 Holes for exhaust tube passage on walls or roof: recommended insulation and
diameter
Once the location of the boiler has been decided (paragraph 4.1), you will have to drill the hole for
passage of the fume exhaust tube. This varies depending on the type of installation (therefore on
the diameter of the drain pipe, see 4.5.2) and type of wall or roof to pass through (tab.3).
The insulator must be of mineral origin (rock wool, ceramic fibre) with a nominal density greater
than 80 kg/m3.
Wooden wall, or wall which
is flammable or has
flammable parts
Concrete wall or roof
Brick wall or roof
4.5.4 Using a traditional type chimney flue
If you wish to use an already existing chimney flue, it is advisable to have it checked by a
professional chimney sweep to ensure that it is watertight. This is because fumes, being slightly
pressurised, could infiltrate in cracks of the chimney flue and invade living spaces. If an inspection
finds that the chimney flue is not perfectly intact, it is advisable to intubate it with new material. If
the existing chimney is large, we recommend inserting a tube with a maximum diameter of 150
mm. It is also advisable to insulate the fume exhaust duct. Figs. 11 and 12 demonstrate the
solutions to adopt if you want to use an existing chimney flue.
Insulation
thickness
[mm]
100
50
30
Fig. 11
Fume exhaust tube diameter [mm]
Diameter of holes to be created [mm]
Fig. 12
17
Ø80
280
180
140