(min. 150 mm). The chimney draught must comply with the specified values (see technical data, page
8). The chimney must not be excessively high, otherwise the boiler effectiveness is decreased and the
combustion is affected (the flame “breaks”). In case of excessive draught, install a throttle valve in the
flue gas duct between the boiler and the chimney.
Indicative values of the chimney cross section dimensions:
20 x 20 cm height 7 m
Ø 20 cm height 8 m
15 x 15 cm height 11 m
Ø 16 cm height 12 m
Exact chimney dimensions are stipulated in Czech standard ČSN 73 4201. Specified chim-
ney draught is stated in section 3 „Technical Data“.
10. Flue-gas duct
The flue-gas duct must be connected into the chimney
vent stack. If the boiler cannot be connected to the chimney
directly, the appropriate flue-gas duct extension must be as
short as possible in the given circumstances, but not longer
than 1m, it must be without additional heating surface and
must incline upwards in the direction towards the chimney.
Flue-gas ducts must be mechanically durable and sealed
against combustion products and gas penetration, and it must
be possible to clean them inside. The flue-gas ducts must
not be lead through another person‘s apartment or property.
The internal diameter of the flue-gas duct must not be larger
than the internal diameter of the chimney intake and it must
not decrease in width in the direction towards the chimney.
Use of elbow-pipes is not suitable. Methods for providing
flue-gas duct entries through flammable material structures
are stipulated in appendices 2 and 3 of the Czech standard
ČSN 061008. These are appropriate for mobile installations,
wooden cottages etc.
1 - Waste gas thermometer
2 - Cleaning aperture
3 - Throttle valve (draught limiter)
INFO - In case of excessive chimney draught, install a throttle valve or draught limiter
(regulator) /3/.
Boiler
Chimney
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