Applications manual
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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
Lower flue gas pipes further into the chimney and repeat
the procedure for all other pipes until reaching the
support elbow.
Have a second person make the connection with the
support elbow at the base of the chimney by slightly
turning the pipe into the gasket. Push down from the top
to ensure a secure connection.
If installing the stainless steel chimney cover, proceed to
page 24.
For the black chimney cover, only the black pipe is UV
proof and may be exposed to the elements above the
roof. Adjust the length of the last white pipe so that the
terminating black pipe extends at least 13” (330mm)
above the top of the chimney where the cover will be
attached. This will result in a minimum of 3” (75mm)
clearance of the pipe above the cap.
Remove the top of the chimney cover (Fig. 13, Item 1) by
pulling it up. Ensure it is held by its leash. Push the cover
over the terminating black pipe and verify that it fits the
top of the chimney. The base can be trimmed to match
the chimney crown by cutting along the lines shown in
Fig. 14, Item 1.
Set cover on the top of the chimney and mark 4 holes.
Drill holes and insert wall anchors. Caulk around the
perimeter of the cover to prevent rain water from entering
the chimney and screw down firmly. Push upper part of
the chimney cover over the flue gas pipe and press down
until it snaps in place.
Fig. 13 Chimney cover
1 Chimney cover
Fig. 14 Base of chimney cover
1 Lines indicating where cover base can be cut to size.
