Wolf COB Technical Manual And Installation Instructions page 43

Installation in an existing
chimney/duct
3062547_201802
26 Cascade operation - Flue gas
header design
The maximum horizontal length of the flue gas header is 1.0 between the devices and
2.0 m behind the last device. In addition to the boiler connection bend, a maximum of
two 87° diverters may be installed.
Minimum cross-section of the duct: With a round duct, the clear distance from the flue
to the duct wall must be at least 3 cm and with an angular duct, at least 2 cm.
The flues must be installed in ducts and channels in such a way that it is possible to
inspect and, if necessary, clean the ventilated cross-section. Close cleaning apertures
in ducts with chimney cleaning covers which have been assigned a test mark.
The distance from the cleaning and inspection aperture in the duct/channel to the front
edge of the flue can be twice the diameter of the flue, up to a maximum of 35 cm, as
long as cleaning and inspection do not take place at the outlet.
Flues in shafts should be designed at the outlet in such a way that no precipitation can
enter the space between the flue and shaft, and the secondary ventilation can escape
freely.
Removable covers must be able to be removed without tools and be secured to prevent
them falling.
Retaining straps and spacers must be designed in such a way that it is possible to
inspect and, if necessary, clean the free cross-section of the shaft.
Provide sufficient cleaning and inspection apertures.
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