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Compare galvanized steel, stainless steel, and aluminum air duct materials. Learn how environment, hygiene requirements, and lifecycle cost influence HVAC duct selection.

Compare rectangular and spiral HVAC ducts in airflow efficiency, installation, cost, leakage control, and acoustic performance. Practical guidance for real project selection.

Learn the basics of HVAC air duct systems, including components, airflow layouts, materials, and performance factors for commercial and industrial buildings.