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Air / Flue gas system - dimensioning
Twin Pipe ue gas system
Maximum permissible length of ue
gas system in m
Twin Pipe flue
gas system
Equivalent length in m
Ø80 Ø100 Ø110 Ø125 Ø130
Straight
pipe
11111
Bend R=D
90°/87°
1.5 1.8 2 2.2 2.2
Bend R=D
45°/43°
0.8 0.9 1 1 1
Concentric ue gas system
Maximum permissible length of ue
gas system in m
Concentric
flue gas
system
Equivalent length in m
Bend R=D
90°/87°
Bend R=D
45°/43°
Ø100/150
1.5 1
Dimensioning
When dimensioning a ue gas sys-
tem, it’s necessary to perform a cal-
cula on check of the ue gas system
in order to verify if the choosen sys-
tem is applicable.
The following table shows an exam-
ple of possible ue gas system, in-
cluding the maximum possible length
of the system.
This example only give an indica on
of the possible length, but it can not
be used for o cial ue gas layout cal-
cula on. Each ue gas system has to
be calculated by an authorized com-
pany.
The maximum nega ve ue gas pres-
sure, which doesn’t a ect the burner
modula on ra o, is 30 Pa. Higher
nega ve pressure will lead to limita-
on of the burner modula on ra o.
The maximum horizontal ue
gas length is 20 m. With horizon-
tal lengths longer than 20 m, a
faultless burner start in cold con-
di on can not be guaranteed.
Concentric ue gas system
The Boiler boiler models 60, 70, 80,
100 and 120 can be connected to a
concentric ue gas system.
Via a parallel-to-concentric adapter
(op onal) the boiler can be connect-
ed to:
100/150 concentric system
See table for max. permissible ue
lengths.
TH-L Evo
Ø 80 / 125 Ø 100 / 150
60
12 38
70
933
80
423
100
-10
120
-3
Thision L
Evo
Ø80 Ø100 Ø110 Ø125 Ø130
Lmax
[m]
Lmax
[m]
Lmax
[m]
Lmax
[m]
Lmax
[m]
60
17 62 - - -
70
13 52 65 - -
80
73647 - -
100
- 13235688
120
-272236
140
--51423
17


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