Venting Installation
Continued
if properly locked. It is not necessary to add screws to keep the chimney together (excep- tion, see Figure 10).
Using ELBOW offsets (30E-12DM)
1.To achieve desired offset, you may install combinations of 12", 18", 24", 36" and 48" length of double wall pipe (see offset chart and Figure 10).
2.Chimney weight above offset rests on return elbow. Straps must be securely nailed to rafters or joists (see Figure 11, details A and B).
3.Maximum length of pipe between sup- ports (return elbow or
OFFSET | RISE |
| CHIMNEY LENGTH |
| ||||
A | B | 12" | 18" | 24" | 36" | 48" | ||
4 3/8" | 16 3/8" |
| ELBOW SET ONLY |
| ||||
9 3/4" | 25 1/2" | 1 |
|
|
|
|
|
|
12 3/4" | 30 3/4" |
|
| 1 |
|
|
|
|
15" | 34 3/4" |
|
|
| 1 |
|
|
|
18" | 40" | 1 |
| 1 |
|
|
|
|
21 1/4" | 46 1/4" |
|
|
|
| 1 |
|
|
23 3/4" | 49 1/4" |
|
| 1 | 1 |
|
|
|
27 3/4" | 56 3/4" |
|
|
|
|
|
| 1 |
30" | 60 3/4" |
|
| 1 |
| 1 |
|
|
33" | 66" |
|
|
|
|
|
| 1 |
36" | 71" |
|
| 1 |
|
|
| 1 |
38 1/4" | 75" |
|
|
|
| 2 |
|
|
41 1/4" | 80 1/4" | 1 |
| 1 |
| 1 |
|
|
45" | 86 3/4" |
|
|
|
| 2 |
|
|
46 3/4" | 89 1/2" | 1 |
| 1 |
|
|
| 1 |
51" | 97" |
|
|
|
| 1 |
| 1 |
53 1/4" | 101" |
|
|
|
| 2 |
|
|
56 1/4" | 106 1/4" |
|
|
|
|
|
| 2 |
59 1/4" | 111 1/2" |
|
| 1 |
| 1 |
| 1 |
61 3/4" | 115 1/2" | 1 |
|
|
|
|
| 2 |
64 3/4" | 120 3/4" |
|
| 1 |
|
|
| 2 |
68 1/4" | 127" |
|
|
|
| 2 |
| 1 |
70" | 130" | 1 |
| 1 |
|
|
| 2 |
74 1/4" | 137 1/2" | 1 |
|
|
| 2 |
| 1 |
76 3/4" | 141 1/2" |
|
| 1 |
| 2 |
| 1 |
79 3/4" | 146 3/4" |
|
|
|
| 4 |
|
|
OFFSET CHART
4.All pipe connections between the offset and return must be secured with two screws on the outer pipe only (see Figure 10). Do not penetrate the inner stainless.
See Detail A
2" Min.
Straps
Detail BStraps | See Detail B | |
Angle Firestop | ||
|
Straps
Straps
Detail A
Return Elbow
Figure 11 - Ceiling Support Pipe
Screws
B
A
