Equivalent Vent Length Calculation Examples - Viessmann Vitodens 100-W WB1A-24 Installation Instructions Manual

Vertical Vent Installation (Coaxial)
Vent Length Requirements
Equivalent vent calculation examples
Fig. 28
Equivalent vent length calculation, example 1
Fig. 29
Equivalent vent length calculation, example 2
32
(continued)
Table 18.
Type of fitting Equivalent
length
87º elbow/ 1.6 ft./0.5 m
87º inspection tee
45º elbow 1 ft./0.3 m
IMPORTANT
Always include vent termination length
in calculations.
Equivalent vent length calculation
example 1
Vitodens 200-W, WB2 15-60 (Fig. 28)
(vent system 100/150)
2 x 45º elbow
. . . . . . . . . . . . . . . . . . . . . . . . . . .
1 x vent pipe (0.5 m)
. . . . . . . .
1 x vent pipe (1 m)
. . . . . . . . . . . . . . . .
1 x vent termination
. . . . . . . . . .
Total equivalent length 10.8 ft./3.3 m
Equivalent vent length calculation
example 2
Vitodens 100-W, WB1A 8-30 (Fig. 29)
(vent system 60/100)
Vitodens 200-W, WB2 8-32
(vent system 80/125)
2 x 87º elbow
. . . . . . . . . . . . . . . . . . . . . . . . . . .
2 x 45º elbow
. . . . . . . . . . . . . . . . . . . . . . . . . . .
3 x vent pipe (0.5 m)
. . . . . . . .
1 x vent pipe (1 m)
. . . . . . . . . . . . . . . .
1 x sliding coupling 0.8 ft./0.25 m
. . . . . . . . .
1 x vent termination
. . . . . . . . . .
Total equivalent length 18.1 ft./5.55 m
2 ft./0.6 m
1.6 ft./0.5 m
3.3 ft./1 m
3.9 ft./1.2 m
3.3 ft./1 m
2 ft./0.6 m
4.8 ft./1.5 m
3.3 ft./1 m
3.9 ft./1.2 m