In today's rapidly evolving technological landscape, ensuring the reliability, efficiency, and compliance of air handling units (AHUs) is more critical than ever. As the backbone of modern HVAC systems, AHUs play a pivotal role in maintaining indoor air quality and thermal comfort in various environments, from residential buildings to complex industrial facilities. Given their importance, the Factory Acceptance Test (FAT) for AHUs has emerged as a crucial phase in the manufacturing and commissioning process, offering a robust framework to verify that these units meet the stringent demands of performance and safety before they are installed and operated. This book, "Air Handling Unit Factory Acceptance Test," is designed to be an indispensable resource for engineers, project managers, quality assurance professionals, and anyone involved in the design, manufacturing, and testing of AHUs. It aims to provide a comprehensive guide to the principles, procedures, and best practices of conducting effective FATs, ensuring that AHUs function as intended and deliver optimal performance throughout their lifecycle. Drawing on years of industry experience and the latest advancements in technology, this book covers every aspect of FAT, from initial preparations and detailed testing procedures to data analysis and post-FAT activities. It offers practical insights, step-by-step protocols, and real-world case studies to help readers navigate the complexities of FAT with confidence and precision. The motivation behind this book stems from the recognition that a well-executed FAT not only guarantees the quality and reliability of AHUs but also significantly reduces the risk of costly failures and operational disruptions down the line. By adhering to the guidelines and recommendations provided in this book, stakeholders can achieve a higher standard of quality assurance, thereby enhancing the overall value and dependability of their HVAC systems. I would like to express my gratitude to the many professionals and experts who have contributed their knowledge and experience to this endeavor. Their insights have been invaluable in shaping the content of this book and ensuring that it addresses the practical challenges faced by practitioners in the field. As you embark on this journey through the intricacies of AHU FAT, I hope that this book serves as a valuable tool in your professional toolkit, helping you to execute tests with greater accuracy, efficiency, and confidence. Whether you are a seasoned veteran or new to the field, the principles and practices outlined here will equip you with the knowledge and skills needed to excel in your role and contribute to the successful implementation of high-performing air handling units. Thank you for choosing this book as your guide. I trust that you will find it both informative and empowering. Audience The audience for Factory Acceptance Testing (FAT) for Air Handling Units (AHUs) may include: Engineers and Technicians: Involved in the design, installation, and maintenance of HVAC systems, including AHUs. They require detailed technical information and procedures related to FAT. Project Managers: Responsible for overseeing AHU projects, including FAT activities. They need to ensure that the FAT process is completed on time, within budget, and meets project requirements. Manufacturers and Suppliers: Involved in manufacturing AHUs and conducting FAT to verify product quality and compliance with specifications. They require guidance on conducting effective FAT and meeting customer expectations. Regulatory Authorities: Responsible for enforcing standards and regulations related to AHUs and HVAC systems. They need to understand FAT procedures and documentation to ensure compliance. Facility Managers: Responsible for the operation and maintenance of HVAC systems, including AHUs. They may need information on FAT outcomes to understand AHU capabilities and performance. Consultants and Designers: Involved in specifying AHUs for building projects. They require knowledge of FAT procedures and documentation to ensure AHUs meet project requirements. End-users and Owners: Ultimately responsible for the performance and reliability of AHUs in their facilities. They may need information on FAT outcomes to make informed decisions about AHU selection and operation.