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Metal is commonly used in ductwork for HVAC systems due to its durability, strength, and ability to handle high airflow and pressure. Metal ducts, often made from galvanized steel or aluminum, provide a reliable and long-lasting solution for transporting air throughout a building. They resist damage and are less susceptible to mold and other issues compared to other materials.

Additionally, metal ducts can be insulated to increase energy efficiency and improve system performance. They also generally provide better air sealing than other duct materials, which is essential for maintaining optimal energy use and indoor air quality.

While plastic, wood, and glass might have some applications in specific circumstances, they do not offer the same level of efficiency, stability, and effectiveness for standard ductwork in HVAC systems as metal does. Each of these materials has limitations that can affect airflow, longevity, and maintenance, making metal the preferred choice in the majority of HVAC installations.