Flange plate mainly by Corner, flange clamps, galvanized sheet duct, and the duct connecting flange integrally connected, although the cost of this form of air duct is low (angle reduces the amount of reduction in the production angle method blue artificial dosage), but it is better to practice solid angle flange, air leakage is large, and must be processed through a machine, handmade hardly achieve its production, supply galvanized sheet duct, generally apply only to new wind system, galvanized sheet duct model, air-conditioning systems, exhaust system or frequently used angle flanged duct. But the air defense projects are absolutely not allowed to use a total of flange connection mechanism galvanized ventilation ducts, duct mechanism, galvanized duct is air conditioning, ventilation exhaust system, decontamination commonly used products. Galvanized sheet duct type, Yanda air conditioning (certified), galvanized sheet duct provided by the 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.