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3062547_201802
The maximum horizontal length of the ue 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 ue
to the duct wall must be at least 3 cm and with an angular duct, at least 2 cm.
The ues 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 ue can be twice the diameter of the ue, 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 ue 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 sufcient cleaning and inspection apertures.
Installationinanexisting
chimney/duct
26 Cascadeoperation-Fluegas
headerdesign
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