Table 4 - Category I Horizontal Venting Requirements
| Vent | Maximum Number | Maximum Horizontal | Minimum | Extension |
Unit | Diameter | Elbows | Vent Length | Vertical Rise | Distance |
Size | (in) | * | (Ft.) | (In.) | from Wall |
|
|
|
|
|
|
30 | 4 | 1 | 4 | 12 | 36 |
| 4 | 1 | 8 | 18 | 36 |
| 4 | 2 | 4 | 12 | 36 |
| 4 | 2 | 8 | 18 | 36 |
|
|
|
|
|
|
45 | 4 | 1 | 10 | 18 | 36 |
| 4 | 2 | 5 | 18 | 36 |
| 5 | 2 | 10 | 12 | 36 |
|
|
|
|
|
|
60 | 5 | 2 | 10 | 12 | 36 |
|
|
|
|
|
|
75 | 5 | 2 | 10 | 24 | 36 |
|
|
|
|
|
|
90 | 5 | 1 | 10 | 24 | 24 |
| 5 | 2 | 10 | 36 | 24 |
|
|
|
|
|
|
*One elbow is required to make the vertical extension, See Figure 13.
Figure 13 - Category I Horizontal Venting Requirements
D-06838A
14
