Operation Manual - GB
GB
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GB - 13
9. 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 throu-
gh 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 - Throttling flap (draught reducer)
INFO -
In case of too strong draught of the chimney install a throttling flap /3/ or a draught
reducer in the flue gas duct, see the ATMOS price list.
10. 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 distance must
also be maintained in case of installation of fixtures near boilers.
If boilers are located on a floor of flammable materials, they must be installed on a non-flam-
mable, heat-insulating pad, exceeding the ground plan at the side of the feeding and ashpan opening
