Gas airtight suspended warm air heaters - EOLO
24
SYSTEMA S.p.A.
Rev. 10EE0112
Fig. 17 Lengths of fume and combustion air ducts
6 DISCHARGE AND SUCTION DUCTS
The fume discharge ducts relevant to type C appliances with natural or forced draft, must comply with
the following conditions:
they must be metal, be constructed in materials resistant to normal mechanical stress,
heat and the action of combustion products and any condensation through time; the use of
corrugated ducting is not permitted.
It is possible to use both rigid pipe in stainless steel and in aluminium (the latter with a minimum
thickness of 1.5 mm).
As a connection it is possible to utilize double wall flexible stainless steel pipe with a smooth internal
surface (previously subjected to testing according to EN 166/21).
For combustion air ducts to the burner any kind of metal pipe can be used.
For fume ducts over 5-6 m in length, bear in mind that condensation phenomena could occur
inside the ducts if these are not sufficiently insulated.
(1) Make sure that rooms are specifically
ventilated for type B applications
(1)
(1)
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