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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
Chimney connection
The elbow and rail support the weight of the vent pipe
inside the chimney. Ensure both are installed properly
and provide support.
Shorten the penetrating pipe and flue gas pipe so it
extends approx. 2” (50 mm) beyond the face of the
chimney (Fig. 15). Carefully remove the burrs from cut
edges.
Coat the gasket (Fig. 15, Item 2) of the concentric wall
penetration and the mating pipe of the support elbow with
CENTROCERIN® and assemble using a slight turning
motion. Allow a 5/8” pitch per foot (55mm per meter)
toward the boiler. Mortar the penetrating pipe in place.
Slide on the face plate (Fig. 15, Item 1), and once the
mortar has cured, mark and drill mounting holes, insert
wall anchors, and screw on the face plate.
Connection to the boiler
Connect the inspection and clean-out pipe to the boiler
adapter. Measure the remaining distance to the chimney
penetration and complete the connection with concentric
pipe as described in chapter 5.6.
Ensure a 5/8” pitch per foot (55mm per meter) toward the
boiler (Fig. 16).
For more details consult the GAK installation manual.
Fig. 15 Chimney connection
1 Face plate
2 Gasket in chimney penetration
Fig. 16 Boiler connection
