Installation guide

Side Wall Vent Installation (Coaxial)
Fig. 14 Equivalent vent length calculation
*
4
22
Vent Length Requirements
Maximumventlength
Table 8. Table 9.
Standard sizes of boiler flue gas adaptors Boiler model Vent system
Boiler model Adaptor size
60/100 80/125 100/150
WB1B 10-26
WB1B 10-35
60/100 WB1B 10-26
WB1B 10-35
82 ft / 25m
(see Fig. 14)
98 ft / 30m
*1
(see Fig. 15)
118 ft / 36m
*2
(see Fig. 15)
WB2B 9-19
WB2B 9-26
WB2B
9
-
3
5
60/100 WB2B 9-19
WB2B 9-26
33 ft / 10m 43 ft/ 13m
*1
52 ft / 16m
*2
W
B
2
B
9
-
3
5
WB2B 9-35 26 ft / 8m 36 ft / 11m
*1
49 ft / 15m
*2
WB2B 17-45
WB2B 17-60
80/125 WB2B 17-45
WB2B 17-60
33 ft / 10m 43 ft/ 13m
*3
WB2B 30-80
WB2B 30-105
100/150 WB2B 30-80
WB2B 30-105
43 ft/ 13m
*1
If used with increasers 60/100 to 80/125.
*2
If used with increasers 60/100 to 100/150.
*3
If used with increasers 80/125 to100/150.
87º elbow
Vent pipe (3.3 ft./1 m)
Vent pipe (1.6 ft./0.5 m)
Vent termination
*
4
First elbow not included in equivalent
vent calculation
.
H For maximum equivalent vent length
on all models see tables 8. and 10.,
andFigs.14(left)and15onthe
following pages.
H Do not exceed the maximum vent
length.
H Do not use more than five elbows
(87º or 45º) within one vent system
(first elbow is included in count).
H First 87º elbow on boiler is not
included in equivalent vent length
calculation.
Table 10.
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
First elbow not included in equivalent
vent calculation.
Always include vent termination length
in calculations.
5368 815 v2.0 b
IMPORTANT