1, mechanical production, avoid caused by hammering noise production mode;

2, easy to install, fast, reduce labor costs;

3, good air tightness tight popular duct lockstitch;

4 popular duct, high strength and good rigidity, strong and durable;

5, less than the rectangular pipe joint, reduce leakage, reduce air flow noise;

6, reduce installation costs, reduce the amount of insulation cotton;

7, popular duct standardization, in line with international standards;

8, beautiful, high-grade art, popular duct structure.