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Operation and Maintenance Manual - EN
EN
www.atmos.cz EN-13
7. Flue gas duct of the boiler
The flue gas duct from the boiler must lead to the
chimney vent. If the boiler cannot be connected directly to
the chimney vent, the corresponding flue gas duct adapter
must be as short as possible with regard to the particular
conditions, but not longer than 1 m, without additional
heating surface and it must rise towards the chimney.
Flue gas ducts must be mechanically strong and leak-proof
for flue gas and cleanable inside. Flue gas ducts must not
lead through other owners‘ residential or commercial
units. The inner cross-section of the flue gas duct must not
be larger than the inner cross-section of the smoke uptake
and must not get narrower towards the chimney. The use
of smoke elbows is not suitable. Designs of passages of
flue gas ducts through structures of flammable materials
are defined in Annexes 2 and 3 of ČSN 061008 and are
mainly suitable for mobile units, wooden huts, etc.
1 - Flue gas thermometer
2 - Cleaning opening
3 - Draught regulator (limiter) / throttle valve
INFO - In case of excessive chimney draught, install draught regulator (limiter) /3/ or a
throttle valve, see the ATMOS price list.
8. Fire protection within the installation and use of heat appliances
Extract from ČSN 061008 - Fire safety of local appliances and sources of heat
Safe distances
On installation of an appliance the safe distance from building materials must be maintained, at
least 200 mm. This distance is valid for boilers and flue gas ducts located near flammable materials
of the B, C1 and C2 flammability class (the flammability class is specified in tab. no. 1). The safety
distance (200 mm) must be doubled if boilers and flue gas ducts are located near flammable materials
of the C3 class (see tab. no.1). The safety distance must be doubled if the flammability class of
flammable material is not evidenced. The safety distance may be reduced to a half (100 mm) if you
use a non-flammable heat insulating panel (asbestos panel) with the thickness of at least 5 mm,
located 25 mm from the protected flammable material (flammable insulation). A shielding panel or
protective screen (on the protected object) must exceed the outline of the boilers (incl. flue gas ducts)
at each side by at least 150 mm and the top surface of the boiler by at least 300 mm. A shielding panel
or protective screen must also be used to protect fixtures of flammable materials if the safe distance
cannot be maintained (e.g. in mobile units, huts, etc. - more details in ČSN 061008). The safety
Boiler
Chimney
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