Lightweight air-insulated, double-wall metal construction with an inner pipe of reflecting aluminum and an outer pipe of corrosion-resistant galvanized steel for strength, safety, and durability. Constructed from four sections for smoother bends and less resistance. It adjusts easily from 0 degrees to 90 degrees to clear rafters or ceiling joists.
- Nominal Size: 4"
- Length: 8-3/4"
- End Style: snap lock coupling
- Temperature Rating: 400 - 550 deg F
- Used with type B gas vent system double wall
- UL listed