VENTING INSTALLATION
Continued
USING ELBOW OFFSETS (30E-12DM)
1.To achieve desired offset, you may install combi- nations of 12, 18, 24, 36 and 48" length of double wall pipe (see offset chart and Figure 7).
OFFSET | RISE |
| CHIMNEY LENGTH |
| ||||
A | B | 48" | 36" | 24" | 18" | 12" | ||
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 |
|
|
|
|
| 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 |
| 1 |
|
|
56 1/4" | 106 1/4" | 2 |
|
|
|
|
|
|
59 1/4" | 111 1/2" | 1 |
| 1 |
| 1 |
|
|
61 3/4" | 115 1/2" | 2 |
|
|
|
|
| 1 |
64 3/4" | 120 3/4" | 2 |
|
|
| 1 |
|
|
68 1/4" | 127" | 1 |
| 2 |
|
|
|
|
70" | 130" | 2 |
|
|
| 1 |
| 1 |
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
2.Chimney weight above offset rests on return elbow. Straps must be securely nailed to rafters or joists (see Figure 8, details a & b).
3.Maximum length of pipe between supports (return elbow or
4.All pipe connections between the offset and return must be secured with two screws on the outer pipe only (see Figure 9, page 10). Do not penetrate the inner stainless.
|
| See Detail A | |
|
| 2" Min. | |
Straps |
|
| |
| Straps |
| |
| Detail B | See Detail B | |
Angle Firestop | |||
| |||
Straps | Straps |
| |
|
| ||
Detail A |
| ||
Return Elbow |
| ||
Figure 8 - Ceiling Support Pipe | |||
|
| ||
Return
Elbow
Offset
Elbow
6' Max.
Return
Elbow
Offset
Elbow
Return Elbow 
| Return |
|
| Elbow |
|
| Return |
|
| Elbow |
|
6' Max. | Ceiling |
|
|
| |
| Support Pipe |
|
| 6' Max. | |
|
|
6' Max.
Offset
Elbow
A
Offset Elbow
| Offset |
6' Max. | Elbow |
|
B
6' Max.
C
Figure 7 - Typical Offset Terminations
www.desatech.com | 9 |
