28
5608 741 - 04
Vitodens Rigid and Flex Venting Systems Installation
Vertical Vent Installation (Coaxial)
Vent Length Requirements
(continued)
Equivalent vent length calculation example
Type of fitting
Equivalent length
87º elbow/
87º inspection tee
1.6 ft. (0.5 m)
45º elbow
1 ft. (0.3 m)
Legend
A
Vent termination
B
Vent pipe 3.3 ft. (1 m)
C
45º elbow
D
Vent pipe 1.6 ft. (0.5 m)
E
87º elbow
F
Telescopic extension
*
1
First elbow not included in equivalent vent calculation.
A
B
C
C
D
D
D
E
F
*
1
Equivalent vent length calculation example
IMPORTANT
Always include vent termination length in calculations.
Equivalent vent length calculation example:
Vitodens 100-W, WB1B 35 or Vitodens 200-W, WB2B 35
or Vitodens 200-W, B2HA/B2HB 35 or Vitodens 222-F,
B2TA/B2TB 35 (vent system 60/100) (see illustration on
this page).
2 x 87º elbow........................................3.3 ft. (1 m)
2 x 45º elbow...........................................2 ft. (0.6 m)
3 x vent pipe.........................................4.8 ft. (1.5 m)
1 x vent pipe.........................................3.3 ft. (1 m)
1 x telescopic extension (average length)...1.0 ft. (0.31 m)
1 x vent termination...............................4.2 ft. (1.28 m)
Total equivalent length..........................18.6 ft. (5.67 m)
Standard sizes of boiler flue gas adaptors
*1
Boiler model
Adaptor Size
WB1B 26, 35
60 / 100
WB2B 19, 26, 35
60 / 100
WB2B 45, 60
80 / 125
WB2B 80, 105
110 / 150
B2TA 19, 35
60 / 100
B2TB 19, 35
60 / 100
B2HA 19, 28, 35
60 / 100
B2HB 19, 26, 35
60 / 100
B2HA 45, 60
80 / 125
B2HB 45, 57
80 / 125
B2HA 80, 88, 100, 112, 150
110 / 150