1. The core characteristics of galvanized air ducts are made of galvanized steel plates (the thickness of zinc layer ≥80g/m²) through the bite or flange process, and the zinc layer provides basic corrosion protection. Mainstream specifications in 2025: plate thickness 0.5~1.2mm (selected according to wind pressure requirements), zinc layer salt spray resistance test ≥72 hours. Performance advantages Cost-effectiveness: The cost is only 1/3~1/2 of the stainless steel duct (about 80~150 yuan/㎡ including installation). Lightweight: The density is lower than stainless steel, suitable for large-span lifting (needed to be combined with reinforcement rib design).

2. Typical application scenarios and recommended scenarios: Air conditioning delivery/return air system for ordinary commercial buildings (shopping, office buildings); low-humidity industrial environment (such as electronic factories, warehousing and logistics centers). Disable high-corrosive environments in scenarios (chlorine ion concentration in coastal areas >500mg/m³, chemical acid and alkali gas); food and pharmaceutical industry (plating may fall off contaminated media).

3. New industry dynamics technology upgrades environmentally friendly plating in 2025: chromium-free passivation process (compliant with EU REACH 2025 standards) gradually replaces traditional chromate treatment. Intelligent prefabrication: BIM integrated design + factory prefabrication rate has been increased to 90%, and on-site installation efficiency has been increased by 40%. When the corrosion protection needs of alternative solutions are upgraded, the "galvanized + epoxy coating" composite process can be used (corrosion resistance is increased by 3 times and cost is increased by 20%).

4. Maintenance and life cycle Regular life: 10~15 years (inland dry environment), shortened to 5~8 years in coastal areas; Maintenance points: Check for damage to the coating every 2 years (repair zinc-based coating), and replace the flange sealant every 5 years.