Fig. Example concentric venting system
Caution
During installation, obey the instructions delivered with the sets of air supply components
and the flue gas discharge components. Make sure that the venting system does not
exceed the maximum number of 45º and 90º bends and the maximum pipe length.
Caution
Use a run-off of 50 mm per meter towards the water heater.
Refer to the table for the correct pipe dimensions of the C13 and C33 concentric systems.
Description Unit BFC 28 - 60 BFC 80 - -120
Diameter flue discharge/
air inlet
mm/mm 100/150 130/200
Maximum length m 40 15
Maximum number of 45º and
90º bends
- 7 4
Caution
Both conditions stated in the table must be fulfilled.
Even if you use less than the stated maximum number of bends, the maximum pipe
length still may not be exceeded.
Even if you use less than the stated maximum pipe length, the maximum number of
bends still may not be exceeded.
c
c
0311704_BFC_28-120_III_ENEN_V2.4, 2022-10-17 61
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