28
For coaxial systems, the maximum development value, mentioned in the table above also takes into account an elbow.
For twin flue systems the maximum development value, mentioned in the table includes the exhaust gas/air intake terminal.
Type 5 outlets should respect the following instructions:
1- Use the same ø 80 mm flue pipes for the gas intakes and exhaust gas ducts.
2- If you need to insert elbows in the gas intake and exhaust gas ducts, you should consider for each one the equivalent length
to be included in the calculation of developed length.
3- The exhaust gas duct should jut above the roof by at least 0.5 m.
4- The intake and exhaust gas ducts in Type 5 must be installed on the same wall, or where the exhaust is vertical and the air
intake horizontal, the terminals must be on the same side of the building.
TABLE
A
Concentric outlet
60/100
Min length
Max. length
Length
equivalency for
35 kW
0.3 m
4 m
45
o
elbow
0.5 m
90
o
elbow
1 m
TABLE
B
Concentric outlet
80/125
Min length
Max. length
35 kW
0.3 m
10 m
45
o
elbow
0.5 m
90
o
elbow
1 m
TABLE
C
Twin flue outlet
35 kW
123,5
200
107
25
Fig. 11.14
ø 100
60 mm
In the event that twin flue pipes are used, and the boiler
has a side clearance of less than 60mm from the wall, it
is necessary to cut a larger diameter hole for the flue
pipe, this should be ø100 mm, this will then allow for
easier assembly of the air intake elbow and the tube
outside the wall (see Fig. 11.14).
Fig. 11.15
0
10
20
30
40
50
60
70
80
90
0
10
20
50
60
70
80
90
100
30
Longueur AIR mètre
Longueur fumées mètre
HORIZONT
AL
ZONE DE FONCTIONNEMENT EN CONDUITS SEPARES 35 kW
Longueur fumées mètre
VERTICAL
40
0
20
40
100
120
140
160
180
200
60
80
ZONE DE
FONCTIONNEMENT
Operating zone in separate 35 kW ducts
Operating zone
Flue gas length in metres /
Horizontal
Flue gas length in metres /
vertical
Air length in metres
