Sheet Metal Duct Angle; Item Duct Angle; Type Spiral; Size A 28 Inch; Size B 28 Inch; Angle 45 Degree; Material Thickness 24 Gauge; Material ASTM A653 CSB Hot Dip Galvanized Steel; Inclusions/Features 1/8 Inch Zinc Coated Rivet; Applicable Standard SMACNA