What is the required width of duct hanger material for class 0 or class 1 flexible air ducts?

The correct answer is based on specific installation requirements outlined in industry standards for flexible air ducts. For class 0 or class 1 flexible air ducts, the required width of the duct hanger material is indeed 1.5 inches. This specification ensures that the hanger provides adequate support and stability to the ductwork while allowing for any necessary adjustments during installation.

Using hanger material that meets the designated width is crucial for maintaining the structural integrity of the duct system. If the hanger material were narrower than specified, it could lead to improper support, which may result in sagging or other issues that compromise the performance and efficiency of the HVAC system. Therefore, adhering to these dimensions outlined by industry standards ensures both safety and system effectiveness.