Used to ensure clearance to combustibles is maintained. Also serves as a firestop. Adjusts from 4-1/8" to 7" to fit thickness of wall. Type B gas vent.
| Wall Thickness | 4-1/8" - 7" |
| Size | 4" |
| A Size | 4-5/8" |
| B Size | 8-1/4" |
| Material | Galvanized Steel |
| Temperature Rating | 550 F |
| Grade | UL Listed |
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