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900671-00_NC
10
Figure 16 - Elbow Offset
USING ELBOW OFFSETS (30E-8DM)
1. To achieve desired offset, you may install combinations of 12", 18",
24", 36" and 48" length of double wall pipe (see Figure 16/offset chart).
Note:
For systems with 2 elbow sets, minimum height is 22 feet.
Maximum height for any system is 50 feet.
2. Chimney weight above offset rests on return elbow. Straps must
be securely nailed to rafters or joists (see Figure 17, details A and
B, page 9).
3. Maximum length of pipe between supports (return elbow or 12S-
8DM) is 6' of angle run. Maximum of two 6' angle run sections
per chimney system (see Figure 18, page 11).
B
A
Screws
OFFSET
RISE
CHIMNEY LENGTH
A
B
48" 36" 24" 18" 12"
4
3
/
8
"
16
3
/
8
"
ELBOW SET ONLY
9"
25
3
/
4
"
1
11
7
/
8
"
31"
1
15"
37
3
/
8
"
1
16
3
/
4
"
40
1
/
2
"
1
1
20"
47
1
/
8
"
1
22
5
/
8
"
52
1
/
8
"
1
1
25
1
/
2
"
57
7
/
8
"
1
27
5
/
8
"
62"
1
1
30
3
/
8
"
67
1
/
4
"
1
1
33"
72
5
/
8
"
1
1
35
3
/
4
"
78"
2
37
7
/
8
"
82"
1
1
1
41
1
/
4
"
88
5
/
8
"
1
1
43
3
/
8
"
92
3
/
4
"
2
1
46
5
/
8
"
99
3
/
8
"
2
48
3
/
4
"
103
1
/
2
"
1
1
1
51
1
/
2
"
108
7
/
8
"
2
1
54
1
/
4
"
114
1
/
8
"
2
1
57"
119
1
/
2
"
1
2
59"
123
5
/
8
"
2
1
1
61
3
/
4
"
129"
1
2
1
64
1
/
2
"
134
3
/
8
"
1
2
1
67
1
/
4
"
139
5
/
8
"
4
VENTING INSTALLATION
Continued
Figure 14 Installing Thimble/Outer Pipe
Thimble Cathedral
Ceiling
14" Min.
Outer Pipe Of
Chimney
PENETRATING ROOF
To maintain a 1" clearance to pipe on a roof with a pitch, a rectangular
opening must be cut.
1. Determine center point where pipe will penetrate the roof.
2. Determine center point of the roof. Pitch is the distance the roof drops
over a given span, usually 12". A 6/12 pitch means that the roof drops
6" for each 12" measure horizontally down from roof rafters.
3. Use roof opening chart (Figure 15) to determine correct opening
length and flashing required.
4. Remove shingles around opening measured. Cut out this section.
5. Add next sections of pipe until end penetrates roof line. Check to
see that proper clearances are maintained. Extend chimney by add
-
ing sections of double wall pipe until pipe is minimum of 30" above
highest point of roof cutout. Termination and chimney must extend
a minimum of 36" above highest point where it passes through roof.
14
3
/
8
"
(36.5 cm)
30"
(76.2 cm)
1"
(2.5
cm)
1"
(2.5
cm)
Minimum Measurements
1"
(2.5 cm)
Opening "A"
Pitch
Slope Opening "A" Max. Used Flashing Model No.
Flat
0°
15"
V6F-8DM
0-6/12
26.6°
16
1
/
8
"
V6F-8DM
6/12- 12/12
45.0°
20
3
/
8
"
V12F-8DM
Figure 15 - Roof Opening Measurements
