1. Zhejiang Shangfeng Gaoke Zhuanfeng Industrial – Established 2004, listed company with 109 million RMB registered capital. FH series fire dampers and PY series smoke exhaust valves fully tested and CCC certified by national fire authorities. Products used in 80+ metro lines across 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. Produces "Dule" brand fire protection dampers, smoke exhaust valves, and automatic smoke exhaust skylights. Products used in projects winning national "Lu Ban Award." ISO9001:2008 and ISO14001-2004 certified. Website: [Contact via industry channels] -10

  3. Beijing Tianzhu Valve Factory – Founded 1976, offers fire-rated valves and dampers for building HVAC systems. ISO9001, ISO14001, ISO18000, TS certified. Website: [Contact via industry channels] -4

  4. Yilida Group – Leading Chinese ventilation equipment manufacturer offering fire dampers and smoke exhaust valves for commercial and industrial buildings. Website: https://www.yilida.com

  5. Greenheck (China) – US-based global leader offering UL-classified fire dampers, smoke dampers, and combination fire/smoke dampers for critical applications. Website: https://www.greenheck.com

  6. Ruskin (China) – Global leader in air control dampers offering fire dampers and smoke control systems with manufacturing in China. Website: [Contact via industry channels]

  7. Nailor Industries (China) – Manufacturer of fire dampers and smoke control dampers for commercial HVAC systems. Website: [Contact via industry channels]

  8. Beijing Jinghua Ventilation – Produces fire dampers and smoke exhaust valves for building fire protection systems. Website: [Contact via industry channels]

  9. Shanghai Zhenfan Ventilation Equipment – Specializes in fire dampers and smoke control equipment for commercial and industrial applications. Website: [Contact via industry channels]

  10. Guangdong Ventilation Products – Manufacturer of fire-rated dampers and smoke exhaust systems for high-rise buildings and tunnels. Website: [Contact via industry channels]