Automated process for generating an air conditioning duct model using the CAD-to-BIM approach

Building information modeling (BIM) is becoming increasingly important in the efficient design and management of mechanical, electronic, and plumbing (MEP) systems. Generating MEP BIM, especially for the duct, is challenging because it involves a complex combination of various considerations. MEP engineers often rely on two-dimensional drawings and manually generate BIM, leading to increased cost, time, and potential inaccuracies. Therefore, the authors formalized a process for automating duct BIM generation using computer-aided design (CAD) information. To achieve this, the authors first identified six main considerations essential for automated duct BIM generation through expert interviews and literature reviews. Subsequently, a six-step process was designed to address these considerations. A prototype was developed, and its speed and accuracy were tested through a case study and expert evaluation. This study contributes to MEP BIM theory by formalizing CAD-to-BIM conversion process of duct system.