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 cannot 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 90⁰ elbow: 1 m
Equivalent length for each 45⁰ elbow: 0.5 m
7.2. Flue Types
Figure 6
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