Products include: chain wind flexible ventilation pipe, adjustable tuyere, special air distribution box, special connector, environmental protection fresh air hose, special pipe clamp, sealant tape and other products. Chain wind environment is the first fresh air "octopus laying" technology in China, and the first fresh air flexible special pipe is introduced to replace the original pvc ventilation pipe, which solves the problems of poor environmental protection and low end effect of the original system. And independently developed the special air distribution box and system connector for fresh air, which made the system more efficient and improved the construction efficiency.