Division 23 is the MasterFormat construction category that encompasses all heating, ventilation, air conditioning, and refrigeration (HVAC&R) systems, equipment, and materials. This classification system organizes construction specifications and cost estimates. Division 23 covers everything from equipment selection through commissioning procedures.
Scope and Subcategories
Division 23 is subdivided into sections including mechanical insulation, HVAC piping, ducts, equipment, controls, and testing. It includes boilers, chillers, heat pumps, air handlers, thermostats, refrigeration equipment, and related components. The division addresses installation procedures, performance testing, and operational standards. All work must comply with ASHRAE standards, EPA regulations, and local building codes.
Industry Use and Organization
Architects and engineers organize project specifications using Division 23 to ensure comprehensive coverage of HVAC scope. Contractors and suppliers reference Division 23 classifications for cost estimation, purchasing, and scheduling. The uniform structure facilitates accurate bidding and clear communication between design and construction teams. Division 23 compliance ensures that HVAC systems meet current energy codes and performance standards.