33740-17-0120
Page 19
installation (cont’D)
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
lenGtH (a)
Vent to eXterior
Wall (B)
Wall
tHicKness (c)
6”
15” to 16-1/2”
4-3/4” to 6-1/4”
9”
18” to 19-1/2”
7-3/4” to 9-1/4”
12”
21” to 22-1/2”
10-3/4” to 12-1/4”
Figure 27
corner installation - Vertical, 90
°
elBoW to
HoriZontal oUt tHe Wall
WALL FIRESTOP/
THIMBLE
VENT
CAP
6”
MINIMUM
9”
MINIMUM
D
B
A
C
a
52-1/2”
B
37-1/16”
c
15-1/16”
D
74-1/8”
Figure 28
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.