Where can ductwork run in relation to steel open web construction?

The correct choice is that ductwork can run between or alongside the open web in steel open web construction. This flexibility allows for the efficient use of space while accommodating various mechanical systems within a building. Open web construction features a series of triangular trusses that provide structural support and can create voids where ductwork can be installed.

Installing ductwork between or alongside the open web is advantageous because it minimizes the need for additional framing or support, which can save on materials and labor costs. Additionally, this placement helps in maintaining the required clearances for airflow and can also ease the accessibility for maintenance. Overall, this option is a practical approach that aligns with both building codes and best practices in mechanical system layout.