GB125 Concentric Vent - Buderus

Applications manual
GB125 Concentric Vent
Design Manual
8. Vertical Vent – DO Venting System kit
The DO kit (Fig. 6) is suitable for new construction and
retrofits, and allows a quick and simple chimney
installation through the roof.
The DO-kit contains essential pieces for a concentric
pipe-in-pipe vertical vent application with sealed
combustion from boiler to termination.
Each boiler must be vented with a separate system.
The kit (Fig. 6) comes complete with a vertical
termination, the boiler adapter, and some straight pipe.
Additional straight pipe sections, an inspection and clean
out piece, a suitable roof jack or collar (Fig. 7 & 8), as
well as at least one elbow must be purchased separately.
Included items in basic kit
Before starting any installation work, ensure that all
included items (Table 5) are present, plus any additional
pieces (Table 6) needed to complete the job.
Table 5
Part Description Qty
1 7747016312 Concentric boiler connector
DN80/125 for GB125
1
Fig. 6
DO-kit
2 87092168 Adjustable face plate 1
3 87092172 Rafter support clamp 1
4 87090520 Adapter pipe 1
5 87090520 Concentric extension pipe 1
6 87090528 Concentric vertical roof termination
black
1
Fig. 7
Flat roof collars
Install all horizontal runs with a 5/8 inch per foot (55 mm
per meter) pitch to the appliance to allow condensate to
drain properly.
Fig. 8
2-piece roof jack for sloped roofs
GB125 Concentric Vent Design Manual | 05.2009
Technical specifications are subject to change without prior notice
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