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42
AST 14 C 259/00
7.2 100/60 CO-AXIAL AIR/VENT DUCTS
Dimensions for connection of flue gas duct to co-axial ducts
Type C12
Type C12 horizontal vent duct
The minimum permissible length of horizontal coaxial pipes is 1 metre, not counting the
first elbow connected to the boiler.
Maximum permissible length of horizontal coaxial pipes is 6 metres, not counting the first
elbow connected to the boiler.
For each additional 90° elbow maximum permissible length must be reduced by 1 metre,
while for 45° elbow, it must be reduced by 0.5 metres. The duct is to have a 1% slope
toward the exit direction, in order to prevent rainwater entering it.
Choosing the applicable diaphragm supplied with the boiler (pic. 1)
Flue gas vent diaphragms:
Pipe length [m]
Flue gas vent diaphragm
diameter [mm]
1
≤
L < 3*
Ø 39.8
3
≤
L
≤
6*
Ø 44
* the first elbow from the boiler is not to be accounted for
400
700
134
250
100
Summary of Contents for Nova Florida DELFIS CTFS 24 AF
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