Which division of the specifications book would provide details about fan requirements for an HVAC system?

The division of the specifications book that provides details about fan requirements for an HVAC system is the Division of Mechanical Systems. This section typically includes information about the mechanical components and systems used within a building, such as heating, ventilation, air conditioning (HVAC), plumbing, and other pivotal mechanical systems.

Within this division, specifications cover various types of fans, their performance criteria, installation requirements, sizing, and operational parameters essential for ensuring proper airflow, efficiency, and compliance with design requirements. The focus on mechanical components makes this division the most appropriate source for HVAC-related details, including fans, which are vital for the operation of the system.

The other divisions address different aspects of the building: the Division of Electrical Systems focuses on electrical components and wiring, the Division of Architectural Specifications covers design and aesthetic elements of a building, and the Division of Structural Elements discusses the framework and structural integrity of the construction. Therefore, none of these divisions pertain to the specific needs and requirements related to HVAC systems as effectively as the Division of Mechanical Systems does.