Lennox P1BRENTW-A Installation Instructions Manual page 26

AC CHIMNEY
Figure 25
SLOPE
Roof Pitch
*
0
2/12
4/12
6/12
8/12
10/12
12/12
*
CROSS SLOPE HOLE SIZE
Table 2
ROOF DOWN SLOPE HOLE SIZE
24
Figure 26
AC
6"
15" (380 mm)
15 3/8" (390 mm)
16 1/8" (410 mm)
16 7/8" (430 mm)
18 1/4" (465 mm)
19 5/8" (500 mm)
21 3/8" (545 mm)