1. Zhejiang Shangfeng Gaoke Zhuanfeng Industrial – Established 2004, listed company with 109 million RMB registered capital. Produces fans, air valves, silencers, and ventilation equipment. FH series fire dampers and PY series smoke exhaust valves CCC certified. Served 80+ metro lines in 22 Chinese cities including Beijing, Shanghai, Shenzhen, Guangzhou. Exported to Singapore, Pakistan, Hong Kong. Awarded China Well-Known Trademark, Zhejiang Famous Brand. Website: [Contact via industry channels] -5

  2. Zhejiang Dongyang Huadong HVAC Equipment – Founded 1995, 40,000+ m² facility, 25,000 m² workshop, 188 employees including 58 technical staff. Produces "Dule" brand modular air valves, smoke exhaust valves, volume control dampers, and automatic smoke exhaust skylights. ISO9001:2008 and ISO14001-2004 certified. Products used in projects winning provincial awards and national "Lu Ban Award." Annual production capacity 90 million RMB. Website: [Contact via industry channels] -10

  3. Beijing Tianzhu Valve Factory – Founded 1976, offers control valves and butterfly valves for HVAC and district heating applications. Pressure ratings 0.6-10MPa, conforming to GB, ANSI, API, BS, DIN, ISO standards. ISO9001, ISO14001, ISO18000, TS certified. Website: [Contact via industry channels] -4

  4. Shanghai Zhenfan Ventilation Equipment – Specializes in air valves and ventilation systems for commercial and industrial applications. Website: [Contact via industry channels]

  5. Guangdong Ventilation Products – Manufacturer of HVAC air valves and ventilation equipment for building automation systems. Website: [Contact via industry channels]

  6. Yilida Group – Leading Chinese fan and ventilation equipment manufacturer offering air valves and dampers for HVAC systems. Website: https://www.yilida.com

  7. Greenheck (China) – US-based global leader in ventilation equipment offering commercial and industrial air valves with manufacturing in China. Website: https://www.greenheck.com

  8. S&P (China) – Spanish ventilation manufacturer offering air valves and control dampers for HVAC applications. Website: [Contact via industry channels]

  9. Beijing Jinghua Ventilation – Manufacturer of air valves and ventilation systems for commercial buildings and industrial facilities. Website: [Contact via industry channels]

  10. Shanghai Nanfeng Ventilator – Produces air valves and ventilation equipment for industrial and commercial applications. Website: [Contact via industry channels]