Installation and Service Manual Epsilon-Series
21
6.7.1
Dimensioning of the flue gas and air intake duct
The flue diameter is determined by the total length of the run, including for the connection
pipe, elbows fittings and terminal covers etc. and the type and number of boilers installed
into the system.
An undersized flue pipe can lead to disorders. Look at table 6.7.1.a for the choice of the
system and the correct diameter. The table below shows the maximum flue lengths with
the different boiler outputs. A longer flue gas length can be achieved by increasing the
diameter to ø 100mm.
Explanation table 6.7.1.a:
Parallel flue gas system: maximum noted length = distance between boiler and roof
terminal A
Concentric flue gas system: maximum noted length = distance between boiler and roof
terminal B
When using bends the noted value behind every bend should be deducted from the
maximum straight length.
ø80mm
A
in m
ø100mm
A
in m
EB 40
Maximum straight length 80
18 Maximum straight length 100
39
87° bend resistance length
-1,4 87° bend resistance length
-2,1
45° bend resistance length
-0,9 45° bend resistance length
-2
EB 50
Maximum straight length 80
6 Maximum straight length 100
18
87° bend resistance length
-1,4 87° bend resistance length
-2,1
45° bend resistance length
-0,9 45° bend resistance length
-2
ø80/125mm
B
in m
ø100/150mm
B
in m
EB 40
Maximum straight length 80/125
13 Maximum straight length 100/150
34
87° bend resistance length
-3 87° bend resistance length
-1,7
45° bend resistance length
-1,9 45° bend resistance length
-1,3
EB 50
Maximum straight length 80/125
6 Maximum straight length 100/150
10
87° bend resistance length
-3 87° bend resistance length
-1,7
45° bend resistance length
-1,1 45° bend resistance length
-1,3
Parallel flue system
Concentric flue system
Dimensions flue gas system and air supply system
Table 6.7.1.a
Example:
A EB 40 with a concentric
flue gas system ø80/125mm
has according to the table a
maximum flue straight length
of 13m In the system that is
going to be put in there are
2 x 45° bends, so the
maximum flue gas length
is
13 – ( 2 x 1.9 ) = 9.2 meters.