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The air intake vent must be located at
least:
1.5 m
1.5 m
0.3 m
1.5 m
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).
Minimum length
Maximum length (with 3 90° curves)
Maximum number of curves
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.
TYPE OF SYSTEM
Under
Horizontally away
Over
Away from
WITH DOUBLE-WALL TUBE
3 m
8 m
12
Doors, windows, fume
exhaust outlets, air
gaps, etc.
Fume output
2
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