Air duct is a pipe system used for air transmission and distribution. There are two types of composite air duct and inorganic air duct. Composite air duct is represented by durkduct air duct. It can be classified by section shape and material. Air duct fabrication: stainless steel air duct fabrication is to apply sealant (such as neutral glass glue) to the seam such as bite seam, rivet seam, flange flanging corner, etc. The dust and oil stain on the surface shall be removed before applying sealant. According to the cross-sectional shape, the air duct can be divided into circular air duct, rectangular air duct, flat round air duct and so on. Among them, the circular air duct has small resistance but large height and size, and the manufacturing is complex. Therefore, rectangular air ducts are mainly used. According to the material, the air duct can be divided into metal air duct, composite air duct and polymer air duct. Distribution box manufacturer