Fume Exhaust Duct - LAMINOX Idro TERMOBOILER Mini Series Instructions For Installation, Use And Maintenance Manual

4.5

Fume exhaust duct

4.5.1 General notes
CAUTION: the pellet stove is not like other stoves. Fume draft is forced thanks to a fan that
maintains the pressure in the combustion chamber and slight pressure around the exhaust
duct. Therefore, you must verify that the latter is completely watertight and properly
installed, both from the point of view of function and safety.
Construction of the exhaust duct must be done by specialised personnel or companies, as reported
in the following manual. Always create the exhaust system so that periodic cleaning is assured
without having to dismantle any parts.
Tubes must ALWAYS be sealed with silicone (not cemented) that maintains resistance and
elasticity characteristics at high temperature (250°C) and are to be secured with a Ø3.9mm self-
tapping screw.
• The installation of shutters or valves which may obstruct the passage of flue gas is prohibited.
• Installation in a chimney flue where exhausted flue gas or vapours from other equipment (boilers,
hoods, etc.) is prohibited.
4.5.2 Tubes and maximum usable lengths
All the components must be made of material with A1 fire reaction class UNI EN 13501-1. In
particular, the use of metal extendible and flexible hoses is prohibited.
Double-wall steel tubes with internal nominal diameter of 80 mm or 100 mm (for tubes inside the
chimney flue max 150 mm) must be used.
The male-female connection collars must be at least 50 mm long.
Tube diameter depends on the type of system. The boiler has been designed for Ø 80 mm and Ø
100 mm tubes (check the technical data sheet of the selected model). As can be seen in the table
below, a double-wall Ø 100 mm tube may be necessary in some cases and models.
Type of systems
Minimum length
Maximum length (with 3 90° curves)
For installations situated over 1200 m above sea level
Maximum number of curves
Horizontal sections with min. 5% incline
NOTE: load losses of a 90° curve can be equated with those of 1 metre of tube; the serviceable T-
connection is to be considered as a 90° curve.
Fig.9
With double-wall
tube ø 80 mm
16
1.5 m
4.5 m
-
3
2 m
Fig. 10