Specifications

Installation & Servicing Instructions E-Range
16
6.6.1 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.
Look at table 1 for the maximum flue length and the impact of the length reduction by
using bends.
Explanation table 6:
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.
ø80/125mm
B
in m
E32S Maximum straight lenth 80/125 24
87° bend resistance length -2,8
45° bend resistance length -1,1
Concentric flue system
Dimensions flue gas system and air supply system Table 6
Example:
A 32kW with a
concentric flue gas system
ø80/125mm has according
to the table a maximum flue
straight length of 24m In the
system that is going to be
put in there are 2 x 87°
bends, so the maximum flue
gas length is
24 –(2 x -2.3) = 19.4 meters.