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The standard size for metal straps used for duct support is typically 1 inch wide. This measurement provides adequate strength and flexibility needed for properly securing ducts without risking damage or excessive pressure on the ductwork. A 1-inch width strikes a balance between being sturdy enough to hold the duct in place and providing versatility for various installation scenarios.

Other options suggest different widths, but 1 inch has become a commonly accepted standard that accommodates the needs of most HVAC installations. Choosing a strap width that is either narrower or wider could lead to inappropriate support, risking both the integrity of the ductwork and the overall efficiency of the HVAC system. Proper support is crucial for preventing sagging or misalignment, which can lead to airflow issues and increased energy consumption.