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The maximum horizontal length of the ue gas header is 1.5 m between the
appliances and 1.5 m downstream of the last appliance. In addition to the boiler
connection bend, a maximum of two 87° diverters may be installed.
Pipe length calculation:
The calculated length of the ue comprises the straight pipe length and the length of
the pipe bends.
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 ducts should be designed at the outlet in such a way that no precipitation
can enter the space between the ue and duct, 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 duct cross-section.
Provide sufcient cleaning and inspection apertures.
Installation in an existing
chimney/duct
23. Cascade operation
Flue gas header design / notes
Component Calculated length
87° bend 1.5 m
45° bend 1 m
87° tee with inspection aperture 2 m
Straight pipe Subject to length
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