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GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05 .2009
Technical specifications are subject to change without prior notice
7.
Direct Vent – HTK Venting System kit
The HTK kit contains essential pieces for a concentric
pipe-in-pipe direct vent application with sealed
combustion from boiler to termination (Fig. 5).
The kit (Fig. 5, Table 3) comes complete with a direct vent
termination, 2 elbows, the boiler adapter, and some
straight pipe. If needed, additional straight pipe sections,
an inspection and clean out piece, as well as additional
elbows must be purchased separately. See table 4 for a
complete list of accessories.
Choosing the right location for the terminal is critical to
proper and safe operation of the appliance. Consult the
HTK Installation Manual for details and limitations of the
direct venting system.
A ⅝ inch per foot (55 mm per meter) pitch to the
appliance is needed for all horizontal pipe runs including
the termination.
Inform the homeowner or system operator of the potential
appearance of a steam plume in cold climates.
Ice can develop on the termination in cold climates.
Ensure that ice formation does not pose a hazard on
public walkways.
Each boiler must be vented with a separate system.
In the Commonwealth of Massachusetts a direct
vent boiler is required to be accompanied by CO
detectors per 527 CMR 31.00.
Included items in basic kit
Before starting any installation work, ensure that all
included items are present (Table 3), plus any additional
pieces (Table 4) needed to complete the job.
Table 3
Part Number
Description
Qty
1
7747016312
Concentric boiler connector
DN80/125 for GB125
1
2
87094574
Concentric Elbow DN80/125x87
- 90 degrees
2
3
87094560
Concentric Pipe DN80/125x1000
– 39“ (1000mm)
1
4
7747213564
Concentric Wall Termination
DN80/125 with inside and outside
flashings
1
Fig. 5 HTK-kit
Table 4
Part Number
Description
87094587
Concentric inspection pipe
87094556
Concentric Pipe DN80/125x500 19“ (500 mm)
87094560
Concentric Pipe DN80/125x1000 39“ (1000 mm)
87094600
Concentric Pipe DN80/125x2000 78“ (2000 mm)
87094580
Concentric Elbow DN80/125x15 15 degrees
87094576
Concentric Elbow DN80/125x30 30 degrees
87094570
Concentric Elbow DN80/125x45 45 degrees
87094574
Concentric Elbow DN80/125x87 90 degrees
