Installation guide

Direct Venting (Two-pipe System)
49
Vent Requirements - Stainless Steel (continued)
Additional requirements for stainless steel vent pipe material (continued)
Table 34. Parallel adaptor for two-pipe system
Supplier
Boiler Model Ø inches/mm Qty.
Viessmann HWB2B 17-45, 17-60 3/80
(see fig. 36)
1
HWB2B 30-80, 30-105 4 / 100
(see fig. 37)
1
Parallel vent pipe starter adaptors
for WB2B 17-45, 17-60
Legend
Air intake, max. insertion 2½” /
64mm (use sheet metal screws to
hold in place)
Viessmann parallel adaptor
Stainless steel slip joint vent
starter adaptor
a 3” / 76mm
b 2¾” / 70mm
c 7” / 178mm
d approx. 10¾” / 271mm
e 4¾” / 120mm
Parallel vent pipe starter adaptors
for WB2B 30-80, 30-105
Legend
Air intake, max. insertion 2½” /
64mm (use sheet metal screws to
hold in place)
Viessmann parallel adaptor
Stainless steel slip joint vent
starter adaptor
a 4” / 100mm
b5
1
/
8
” / 130mm
c9
3
/
8
” / 237mm
d12
7
/
8
” / 327mm
e 5½” / 140mm
5368 815 v2.0 b
Fig. 36
a
c
d
b
Flue Air
a
e
Fig. 37
Flue
Air
b
c
d
a
a
e