7-Flues; Flue Sizes; Flue Types - E.C.A. Confeo Premix Operating & Installation Manual

7- FLUES

7.1- Flue Sizes

Flue gas connections between the boiler and the flue terminal must be made using original
components specially designed for the condensing boiler to ensure that the device operates
efficiently and correctly. Flue gas pipes and fittings of non-condensing boilers can not be used
for exhausting gases from condensing boilers. In the horizontal concentric flues, the exhaust gas
pipe (the inner pipe) facing outwards should be inclined upward and the fresh air pipe (outer pipe)
should be inclined downward. When the original flue set is installed parallel to the ground, the
exhaust gas pipe is automatically inclined upwards.
Equivalent length for each 90° elbow: 1 m
Equivalent length for each 45° elbow: 0.5 m

7.2- Flue Types

The terminals for the supply of combustion air and for the evacuation of combustion products shall
not be installed on opposite walls of the building. Information for C43 flue type is given below.
Flue gas max flow
rate (gr/sec)
Flue gas min flow
rate (gr/sec)
Flue gas max
temperature (C)
Flue gas min
temperature (C)
Flue gas Pressure
Confeo Premix P
14 kW 20 kW 24 kW
5,8996 8,428 10,1136
2,2638 3,234 3,8808
80 80 80
30 30 30
Table 3
Figure 5
12
28 kW 30 kW
11,7208 13,6808
2,744 3,528
80 80
30 30
100 Pa
35 kW
13,9552
3,6064
80
30