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5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Side Wall Vent Installation (Coaxial)
Venting Length
(continued)
Do not exceed the maximum vent length.
First 87º elbow on boiler is not included in equivalent
vent length calculation.
Type of fitting
Equivalent length
87º elbow/
87º inspection tee
1.6 ft. (0.5 m)
45º elbow
1 ft. (0.3 m)
Equivalent vent length calculation example
2 x 87º elbow...........................................3.2 ft. (1 m)
2 x vent pipe (1 m)....................................6.6 ft. (2 m)
1 x vent pipe (0.5 m)..............................1.6 ft. (0.5 m)
1 x vent termination................................2.4 ft. (0.73 m)
.
Total equivalent length...........................13.8 ft. (4.23 m)
IMPORTANT
First elbow is excluded from in equivalent vent calculation.
Always include vent termination length in calculations.
A 10% boiler input reduction @ 99 ft. (30 m) for all sizes
and all configurations.
Note:
Depending on the selected vent manufacturer,
a service clearance of 36 in. may be required.
Consult the vent manufacturer if using two-pipe
to coaxial adaptor directly at the back of the boiler.
Equivalent vent length calculation
Legend
A
87º elbow
B
Vent pipe 3.3 ft. (1 m)
C
Vent pipe 1.6 ft. (0.5 m)
D
Vent termination
*
4
First elbow not included in equivalent vent calculation.