Equipment flange plate duct needed are: multi-purpose shears, multi undercut machine, multi-beading machine, a total of flange forming machine, TDF folding side flanges, multifunction Corner and hook punch code. Production of galvanized duct board. Duct production process possible problems and the impact of the phenomenon on a project next big edge of the duct with varying degrees of subsidence, both sides of the small side bulge slightly outward, visible deformation. Latest galvanized sheet duct. Cause: 1. The plate thickness does not meet the production duct construction and acceptance specifications. Xi'an galvanized sheet duct. 2. The form seams inappropriate choice. 3. There is no reinforcement measures taken. Wholesale galvanized sheet duct, Yanda air conditioning (certified), Xi'an galvanized duct board by Wu County Yanda air-conditioning plant. Wu County Yanda air-conditioning plant (www.wcydkt.com) (www.wcydkt.com) Shandong Dezhou, heat, refrigeration and air conditioning equipment leader, over the years, the company is implementing the scientific management, innovation and development, honesty and trustworthiness policy, and satisfy customer needs. In Yanda air conditioning leadership with the staff warmly welcome all inquiries negotiations to create Yanda air conditioning better future.