Which of the following is not a typical feature of steel open web joists?

The characteristic of minimal duct space is not typically associated with steel open web joists. These joists are designed to be lightweight and capable of handling long spans effectively, which is another reason they are often favored in construction. The open web design allows for significant flexibility in terms of architectural and structural applications, making them versatile.

The design of open web joists also includes space between the members, which accommodates piping, ductwork, and other mechanical systems. This space provides greater opportunities for integrating HVAC systems and other utilities within the structural system. Therefore, while lightweight structure, versatile design, and high span capability clearly define steel open web joists, minimal duct space does not align with their inherent design advantages.