Answer :
Final answer:
The organizations setting safety standards for manufactured ductwork include the American National Standards Institute (ANSI) and the International Organization for Standardization (ISO), which ensure global harmonization and quality benchmarks, option c is correct.
Explanation:
The organizations that set safety standards for manufactured ductwork include the American National Standards Institute (ANSI) and the International Organization for Standardization (ISO). ANSI, through its participation in international standardization activities, works towards global harmonization of standards to ensure the safety, reliability, and efficiency of products and services, including ductwork.
ISO, established to promote worldwide proprietary, industrial, and commercial standards, also plays a crucial role in setting safety standards for various manufactured products, ensuring that manufacturing processes adhere to a globally accepted benchmark of quality and safety.
While the IEEE is known for setting standards in the field of electrical engineering and information technology, and ASTM International is known for its wide range of standards for materials, products, systems, and services, it's ANSI and ISO that are directly involved with safety standards pertinent to ductwork manufacturing.