Material
ASTM-A653 CS Type B Galvanized Steel, G-30 Coating LFQ Chemical Treatment

Assembly
Starting Collars are assembled with 1/8″ x 1/8″ Zinc Coated Steel Rivets

Collar
Rolled formed and features 1 1/2 crimp and 3/8″ Convex Bead(s) for Branch Duct Connection

Flange
1″ Wide – 30GA – Corrugated for added durability