Shahroud University of Medical Sciences Shahroud Journal of Medical Sciences 2423-6594 12 2 2026 05 02 An Applied Method for Identifying and Evaluating Ducting Nonconformities and the Implementation Status of Change Management in an Industrial Local Exhaust Ventilation System: Checklist Approach 24 36 eng Mahdi Jamshidi Rastani Department of Occupational Health Engineering, School of Public Health, Shahroud University of Medical Sciences, Shahroud, Iran. Mahdi Jamshidi Rastani Environmental and Occupational Health Research Center, Shahroud University of Medical Sciences, Shahroud, Iran. Somayeh Hosseini Health Network of Azima, Shahroud University of Medical Sciences, Shahroud, Iran. Mohsen Nikjoo Unite of Environmental Health, Shroud Municipality, Iran. Kian Dana Division of Environmental Medicine, Grossman School of Medicine, New York University, New York, NY, USA. Mahmoud Heidari Department of Occupational Health, School of Health, Guilan University of Medical Sciences, Rasht, Iran. Mahmoud Heidari Research Center of Health and Environment, School of Health, Guilan University of Medical Sciences, Rasht, Iran. 2025 09 25 2026 01 06 This study aims to provide an applied method for studying the potential problems of ducting systems and the status of change management implementation in a local exhaust ventilation system (LEVS). This study was designed in two sections: providing a self-made checklist for checking compliance with the standards and recommended criteria. The results show that approximately 25% of the branches have changed from the installation/drawings, and the branch connection angle has deteriorated. In each of the 75 elbows used, the recommended R/D ratio is not met. In 47% (7 cases), ducting hood routes have been selected inappropriately. In addition, the process of managing change in documents and drawings has not taken place from the beginning. According to the results, at the time of delivery and operation of the system, sufficient knowledge and experienced people to study the system, align the design data with standards, and implement change management is not available—or at least it appears that this matter is not considered important and therefore not done. This method can be used as a tool for managing change in order to systematically update documents, along with highlighting noncompliant standards. Keywords: Change management, Local exhaust ventilation, Ductwork, Potential problems.