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VERTICAL, 90° ELBOW TO HORIZONTAL OUT THE WALL
(12 inches minimum rise before elbow)
NOTE: A "B" dimension greater than 18 inches will require a
vertical rise before the elbow that is greater than 12 inches. See
Venting graph on page 22.
PIPE
VENT TO EXTERIOR
LENGTH (A)
WALL (B)
6"
15" to 16-1/2"
9"
18" to 19-1/2"
12"
21" to 22-1/2"
33740-7-0515
INSTALLATION (continued)
WALL
THICKNESS (C)
4-3/4" to 6-1/4"
7-3/4" to 9-1/4"
10-3/4" to 12-1/4"
Figure 27
CORNER INSTALLATION - VERTICAL, 90° ELBOW TO
HORIZONTAL OUT THE WALL
A
B
D
A
B
C
D
Note: A horizontal vent with the minimum required vertical rise (using
a 12 inch section of vent before the elbow) will use a maximum 9
inch section of horizontal vent before the termination.
WALL FIRESTOP/
THIMBLE
6"
MINIMUM
C
9"
MINIMUM
52-1/2"
37-1/16"
15-1/16"
74-1/8"
Figure 28
VENT
CAP
Page 19
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