Selkirk double wall gas vent is listed to UL 441 and ULC S-605 and features an aluminum inner liner and galvalume outer casing. Natural and propane gas applications.
| Outside Diameter | : | 3-1/2 in |
| Shape | : | Round |
| Inside Diameter | : | 3 in |
| Material Gauge | : | 28 ga |
| Material | : | Aluminum/Steel |
| Finish | : | Galvanized |
| Length | : | 12 in |
| Nominal Width | : | 3 in |