How is the circumference of a duct calculated?

The circumference of a duct, particularly when considering circular ducts, is calculated by multiplying the diameter by π (pi). This mathematical relationship arises from the definition of π, which is the ratio of a circle's circumference to its diameter. Therefore, using π, which is approximately 3.14, enables one to find the total distance around the circular duct.

This calculation is crucial in sheet metal work for determining various measurements such as the amount of material needed, airflow calculations, and ensuring proper fittings in ductwork. It's a fundamental concept that applies to any circular object, not just ducts, making it a critical piece of knowledge in the field. Understanding this will help you with practical applications in your work as a sheet metal worker.