Applications manual
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21
GB125 Concentric Vent
Design Manual
GB125 Concentric Vent Design Manual | 05.2009
Technical specifications are subject to change without prior notice
9.3. Flexible Chimney Liner – GAK System
with UB Flex
For chimneys with an offset, a flexible liner called UB Flex
is available for parts or the complete length of the
chimney. Other than the rigid pipe that rests on the load
bearing elbow at the bottom of the chimney, the flexible
pipe is suspended from the termination at the top of the
chimney.
Required parts in addition to the GAK basic kit for a
UB Flex install:
Table 10
Part Number
Description
87094036
UB-Flex kit DN83x12500 Flexible flue gas pipe
40ft. (12.5m)
The flexible UB Flex pipe can only be combined with the
GAK system. Do not exceed the maximum vent length
permitted for the size of the boiler (Table 2)
Minimum chimney chase dimensions to ensure sufficient
supply of combustion air:
Rectangular: 5” x 5” (120 mm × 120 mm)
Round:
DIA 5-1/2” (Ø 130 mm);
A stainless steel chimney termination is available for
installations with multi-flue chimneys and a risk of ambers
from wood stoves or similar appliances reaching the top
of the chimney.
The flexible liner may only be installed vertically
with a minimum pitch of 15°, and never instead of
an elbow or a horizontal section.
You will need to purchase the GAK basic kit (Fig. 9), the
UB Flex kit (Fig. 17), the Chimney top end pipe (if not
using the stainless steel cover), plus additional concentric
pipes and elbows to connect the chimney with the boiler.
Prepare the system as described in Chapters 9 and 9.1,
and when the load bearing elbow is in place, continue
here to install the flexible liner.
Included items in the UB Flex kit:
Table 11
Description
Qty
1
Flexible flue gas pipe 40ft. (12.5 m) (part of item
87094036)
1
2
2-Piece chimney spacer (part of item 87094036)
8
3
Split ring (part of item 8709 2180) (not needed
with stainless steel cover)
1
4
Chimney End Pipe (part of item 8709 2180)
(not needed with stainless steel cover)
1
Fig. 17 UB Flex kit
1 Flexible pipe, DN 83, 40’ (12.5m)
2 Spacers DN 83
3 Split ring for attachment to the cover
4 UV proof top end pipe
