503.10.6 Joints.
FGC § 503.10.6
Joints between sections of connector and connections to flue collars and draft hood outlets shall be tight-fitting and fastened by one of the following methods: 1. Galvanized steel – Overlapping joint with sheet metal screws or rivets at a minimum of 4 locations for diameters not greater than 12 inches (304.8 mm) and 8 locations for diameters greater than 12 inches (304.8 mm).
2.Carbon steel – Overlapping joint with 1/2 inch (12.7 mm) tack welds at a minimum of 4 locations for diameters up to 12 inches (304.8 mm) and 8 locations for diameters larger than 12 inches (304.8 mm).
3.Carbon steel – continuous butt welded perimeter.
4.Vent connectors of listed vent material assembled and connected to flue collars or draft hood outlets in accordance with the manufacturer's instructions.













