Hebei Qingnuan Jiezhi Technology Co., Ltd. values every stage from pre-sales to after-sales, providing customers with high-quality products and comprehensive services, and always upholding product quality and service levels. In today's increasingly competitive industry, we consistently deliver high-quality products and excellent services to our customers, winning their trust and respect through integrity.

1/ The air duct protective layer: Both the interior and exterior protective layers of the air ducts are made of fluorocarbon coated steel plates, with a service life of over 30 years.
2/ Fire-resistant and Insulating Layer for Ductwork: The fire-resistant layer of the ductwork is made of inorganic expanded perlite silicate fire-resistant board, and the insulating layer is made of modified polycrystalline fiber thermal insulation board, which boasts excellent fire resistance, thermal insulation, and stability. The fire-resistant duration can reach 3 hours.
3/ Duct Connecting Profiles: The connecting profiles feature a specialized steel integral rolling flange, which is formed in one pass by a rolling machine from galvanized steel plates with high corrosion resistance. This design offers high connection strength and rapid molding efficiency, combining advantages such as good fire resistance, high strength, and long service life.