2.A uct flange, or duct frame, is used in the air conditioning and ventilation industry to bolt lengths of ducting to each other.
3.Material: galvanized steel or stainless steel
4.Flange size: 20/25/30/35/40mm
5.Flange thickness: 0.7-1.2mm
6.Corner size: 20/25/30/35/40mm
7.Corner thickness: 1.0-1.2mm