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Flue systems
6 720 645 817 (2010/09)
76
11.1.2 Plastic flue system
Matching flue systems for these gas condensing boilers
are available for positive pressure operation, i.e.
DN 125, DN 160, DN 200 and DN 250. These flue
systems are made from translucent polypropylene. They
have building regulation approval [Germany] for flue gas
temperatures up to 120 °C. All systems are supplied
ready to plug in; no welding is required.
The condensate created in the flue must be drained off
between the flue and the boiler. The boiler flue
connections offered by Junkers have suitable
connectors for connection to the boiler siphon using the
hose supplied.
Sample calculations for single boiler systems with open
flue operation are shown on the following pages. As
there are many different installation options for flue
cascades and balanced flue operation, these must be
agreed for each individual project with the flue
manufacturer.
Legal requirements
Agree the planning details for a flue system with the
responsible body.
Approval
The plastic flue systems offered by Junkers are approved
[in Germany]. The approval pamphlet is supplied with
the boiler flue connection for every order. Individual
approval pamphlets can be requested for engineering
purposes.
Chimney shaft requirements
Inside buildings, flue systems must be run through a
chimney shaft (not required in adequately ventilated
installation rooms). This must be made from
non-combustible rigid material.
Required fire resistance time:
90 minutes (fire resistance category F90)
30 minutes (fire resistance category F30 for low
buildings)
Any existing chimney that has been in use before must
be cleaned professionally and thoroughly prior to
running the flue into it. This applies particularly to
chimneys that are operated in conjunction with
combustion equipment for solid fuel.
Secondary ventilation clearances to be maintained:
30 mm for round chimney shafts
20 mm for rectangular chimney shafts
Minimum chimney shaft dimensions
Flue nominal
values
Minimum chimney shaft dimensions
Round
chimney shaft
Rectangular
chimney shaft
[mm] [mm]
DN 125 Ø 180 180 × 180
DN 160 Ø 200 200 × 200
DN 200 Ø 250 250 × 250
DN 250 Ø 330 310 × 310
Tab. 43 Minimum chimney shaft dimensions for the
available plastic flue systems
76


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