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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
To connect to the elbow at the bottom of the chimney, a
smooth section of the UB Flex pipe is needed. If the UB
Flex pipe has two corrugated ends, cut one of them off
for it to end in a smooth section.
After measuring the length of the chimney, prepare the
flexible pipe and spacers for installation inside the
chimney before climbing onto the roof again.
Place the two halves of the spacer (Fig. 18, Item 1)
around the pipe and join them together.
Attach a spacer at least every 6 ft. (2 m). Install
an extra spacer within 3 ft. (1 m) of the top of the
chimney.
Tools needed on the roof
–
UB-Flex pipe with spacers attached
–
Black end pipe and split ring – do not use GAK
basic kit black end pipe
–
Chimney cover
–
CENTROCERIN®
–
Rope at least 9’ (3m) longer than the chimney
height
–
Hammer drill with masonry bit 5/8” (6mm)
–
4 wall anchors and screws
–
Matching screwdriver
–
Tape measure
–
Carpet knife or similar
–
Wrench or similar weight
WARNING! RISK OF DEATH FROM FALLING.
Take sufficient measures to prevent accidents on
the roof.
Use state of the art safety equipment and take
common sense safety measures.
WARNING! RISK OF INJURY OR DEATH FROM
TOOLS AND EQUIPMENT FALLING FROM THE
ROOF.
Secure tools and equipment against falling from
the roof.
Grab the smooth end of the UB Flex pipe, and attach one
end of the rope to it. Tie a wrench or similar weight to the
other end of the rope. Lower the weight on the rope from
above into the chimney followed by the pipe. A second
person carefully pulls on the rope to get the pipe past any
offset or obstacle in the chimney flue. The person on the
roof slowly feeds the pipe into the chimney and ensures
all spacers are installed at least every 6 feet (2m), (Fig.
18, Item 1). Lower the pipe further into the chimney and
repeat the procedure until the pipe reaches the support
elbow. Install an additional spacer within 3 feet (1 meter)
of the chimney crown.
Fig. 18 Spacer installation
1 Spacer
2 Rope