Direct Venting (Two-pipe System)
55
Vent Length Requirements
Maximum equivalent vent length - stainless steel system with plastic air intake pipe
Table 39.
(see also fig. 47)
Vent type
Type of fitting
Equivalent
length
ft. / m
Exhaust vent pipe
90° elbow
(stainless steel)
3 / 0.91
45° elbow
(stainless steel)
2 / 0.61
Air intake pipe
90° elbow
(ABS/PVC)
5 / 1.52
45° elbow
(ABS/PVC)
3 / 0.91
Equivalent vent length calculation example
(Vitodens 200-W, WB2 11-44, system diameter 4”)
Maximum allowable equivalent length is 52 ft. / 16 m
(see table 35. on page 51)
2 x 90º stainless steel elbow
6 ft./1.83 m
. . . . . . . . . . . . . . . . . . . . . . . . . . .
2 x 45º stainless steel elbow
4 ft./1.22 m
. . . . . . . . . . . . . . . . . . . . . . . . . . .
Air intake pipe
1 x 90º plastic (ABS/CPVC/PVC) elbow
5 ft./1.52 m
. . . . . .
1 x 45º plastic (ABS/CPVC/PVC) elbow
3 ft./0.91 m
. . . . . .
Exhaust vent pipe
10 ft./3.05 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air intake pipe
10 ft./3.05 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combined total equivalent vent length
(a+b)
38 ft./11.58 m
5
2
8
5
2
6
8
v
3
.8
Note:
For system venting layout
see fig. 48.
IMPORTANT
First elbow not included in equivalent
vent calculation.
Always include vent termination length
in calculations.
Summary of Contents for Vitodens 100-W WB1A-24
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