Our company is a professional company engaged in the central air conditioning ventilation system, fire smoke exhaust system, integrating product development, production and sales in one. Our company is located in the Beijing-Tianjin-Hebei economic circle, near Bohai center area, enjoying a high reputation. To meet the of development needs of ventilation system for modern construction engineering, including central air-conditioning duct, PVC wind pipe flange, central air conditioning and ...