12
The air intake vent must be located at
least:
1.5 m
Under
Doors, windows, fume
exhaust outlets, air
gaps, etc.
1.5 m
Horizontally away
0.3 m
Over
1.5 m
Away from
Fume output
4.5 Fume exhaust duct
4.5.1 General notes
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 (
no cementing
) 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 dampers or valves which may obstruct the passage of exhaust fumes
is prohibited
.
•
Installation in a chimney flue where exhausted fumes or vapours from other equipment (boilers, hoods,
etc.)
is prohibited
.
4.5.2
Tubes and maximum usable lengths
Painted aluminized steel tubes, stainless steel tubes (Aisi 316) or porcelain tubes.
Flexible hoses are permitted if they fall within the limits prescribed by law (in stainless steel with smooth
inner wall).
TYPE OF SYSTEM
WITH DOUBLE-WALL TUBE
Minimum length
3 m
Maximum length (with 3 90° curves)
8 m
Maximum number of curves
2
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.
