Applications manual
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23
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009
Technical specifications are subject to change without prior notice
Have the second person coat the gasket of the elbow and
the mating smooth flexible pipe end with
CENTROCERIN® and assemble pipe by slightly turning
the pipe into the gasket (Fig. 19).
On the roof cut the UB-Flex pipe approx. 18” (450mm)
above the top of the chimney (Fig. 19) if using the
composite cover, and flush with the top of the chimney if
using the stainless steel cover.
If installing the stainless steel chimney cover, proceed to
page 24.
If using the black chimney cover, remove the top of the
chimney cover (Fig. 20, item 1) and ensure it is held by
its leash. Center the cover over the top of the chimney
(Fig. 20, item 4).
The base of the chimney cover can be trimmed to size
along the perforated lines (Fig. 20, item 5) to match the
chimney crown. Mark and drill 4 holes, and insert wall
anchors.
Pull the flexible pipe from the underneath through the
cover and hold the pipe with one hand. Put the cover
down onto the chimney crown and pull the pipe up until
tight.
Slide the split ring (threads facing up) over the flexible
pipe and let it snap into a groove in the cover. Turn the
pipe until the nose in the split ring meets the notch in the
cover.
Caulk around the perimeter of the cover to prevent rain
water from entering the chimney, and screw down firmly.
When looking down into the flexible pipe, you should see
a fairly straight pipe. If major twists and turns occur, pull
up on the pipe and snap the split ring into a grove closer
to the cover. Again ensure the nose in the split ring meets
the notch in the cover.
Cut the UB Flex pipe flush at the split ring. Screw the
black top piece into the split ring until hand tight.
Push upper part of the Chimney Cover over the flue gas
pipe and press down until it snaps in place.
Only black pipe is UV proof and may be exposed to the
elements above the roof.
For more details consult the GAK installation manual.
Fig. 19 UB chimney bottom
1 Elbow
2 Support rail
3 Opening in chimney
Fig. 20 UB chimney cover
1 Cover top (black)
2 Top end pipe (black) - do not use GAK basic kit black end pipe
3 Split ring (black)
4 Chimney cover (black)
