________________________________________________________________________________
88
AST 14 C 255/00
Type C32 vertical vent
Minimum permissible length for vertical coaxial pipes is 1 metre, equal to the length of the
chimney.
The maximum permissible length of horizontal coaxial pipes is 6 metres for 24 kW models,
7 metres for 28 kW models and 5 metres for 32 kW models, including the chimney.
For each additional 90° elbow, maximum permissible length is to be reduced by 1 metre,
whereas for the 45° one by 0.5 metres. Roof vent terminal is equivalent to 1.5 metres of
pipe.
Flue gas vent diaphragms:
Pipe length [m]
Flue gas vent diaphragm diameter [mm]
24 kW
28 kW
32 kW
0.5
≤
L
≤
2
39.8
39
39.8
2 < L
≤
3
42
41
41
3 < L
≤
4
45
44
4 < L
≤
5
49
47
47
5 < L
≤
6
-
Not allowed
6 < L
≤
7
Not allowed
-
