1: The duct flange is an important component in the ventilation duct system for connecting the duct and achieving a stable connection between the duct and equipment, components, etc. 2: The duct flange is usually a flat ring structure, generally made of metal materials such as flat steel, angle steel or channel steel through cutting, welding, bending and other processes. There will be a number of evenly distributed bolt holes reserved around it for installing bolts, so as to achieve connection and fixation with other duct sections or related equipment. 3: Batch customization is carried out according to the style and size required by the customer, and customizable materials include galvanized, stainless steel, carbon steel, etc. 4: The specifications and sizes of the duct flange are diverse, and will be selected according to the diameter of the connected duct. Common specifications include side lengths (or diameters) ranging from tens of millimeters to several meters, and the thickness will also vary due to factors such as bearing pressure and use environment. The general thickness ranges from a few millimeters to more than ten millimeters, and the number, diameter and distribution spacing of the bolt holes also have corresponding standard specifications to ensure the stability and versatility of the connection.