Direct Venting (Two-pipe System)
56
Vent Length Requirements
Maximum equivalent vent length - CPVC system
Table 40.
(see also fig. 47)
Type of fitting
Equivalent
length
ft. / m
90° long sweep
elbow (CPVC)
5 / 1.52
45° long sweep
elbow (CPVC)
3 / 0.91
Equivalent vent length calculation example
(Vitodens 100-W, WB1A 8-24, 8-30, system diameter 3”)
Maximum allowable equivalent length is 52 ft. / 16 m
(see table 35. on page 51)
2 x 90º elbow
10 ft./3.05 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
4 x 45º elbow
12 ft./3.66 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Exhaust vent pipe
10 ft./3.05 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Air intake pipe
10 ft./3.05 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Combined total equivalent vent length
(a+b)
42 ft./12.81 m
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Legend
Support system
Exhaust pipe termination with
screen
Combustion air intake with screen
a
Equivalent vent length (exhaust)
b
Equivalent vent length (air intake)
5
2
8
5
2
6
8
v
3
.8
Vitodens Boiler
a
b
Starter Adaptor
Parallel Adaptor
Boiler Adaptor
Side Wall
Caulk here
(exterior caulking)
Air
Flue
Field Supplied
Exhaust/Air Intake
Pipe and Fittings
Fig. 48
Summary of Contents for Vitodens 100-W WB1A-24
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