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Page 25 of 53
2-Ply Aluminum Flex Vent
The minimum vent system for horizontal termination must consist of:
2” (50.8 mm) vertical length (measured to center of vent pipe) with a 45 degree bend and a
9.5” (241 mm) horizontal length (measured from center of vent pipe)
Wall thimble part# B92
Horizontal termination cap part # 1393
The maximum horizontal vent system consists of:
34’ (10363 mm) vertical length with 3 - 90 degree bends and a 20’ (6096 mm) horizontal
length (measured to center of vent pipe)
Wall thimble part# 1392
Horizontal termination cap part # 1393
Note: 2-Ply Horizontal venting shall be supported, by means of a steel strap, every 3’.
Example: Where A---A = Vertical @ 2’
And B---B = Horizontal @ 5’)
EXAMPLES
MINUMUM VERTICAL (V1 + V2)
MAXIMUM HORIZONTAL (H1 + H2 + H3 + H4)
4’
10’
8’
20’
MAXIMUM VERTICAL HEIGHT = 34’
MAXIMUM HORIZONTAL OFFSETS = 20’
MAXIMUM 90° ELBOWS PERMITTED = 3
V1
20’
H1
H2
V2
H3
34’
A
A
B
B
Restrict @ 60%
Restrict @ 40%
Restrict @ 20%
20’
Restrict @ 60%
Restrict @ 40%
Restrict @ 20%
Through the roof terminations must
use certified hard pipe products listed
with Dura-Vent, Selkirk Venting, Icc
Venting, Security Venting or Metal-
Fab Venting with items shown below
connecting to a flex to rigid adapter
and a 4x7adp and a 3x6adp adapter.
Flex to Rigid Adapter
3x6Adp Adapter
Rear Vent 7” Min Horizontal
2’ Max Horizontal
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