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Where HVAC zones are defined on HVAC design drawings, each HVAC zone shall be modeled as a separate thermal block.
Exception: Different HVAC zones shall be allowed to be combined to create a single thermal block or identical thermal blocks to which multipliers are applied, provided that:
  1. The space use classification is the same throughout the thermal block.
  2. All HVAC zones in the thermal block that are adjacent to glazed exterior walls face the same orientation or their orientations are within 45 degrees (0.79 rad) of each other.
  3. All of the zones are served by the same HVAC system or by the same kind of HVAC system.

Related Code Sections

C407.5.2 [CE] Commercial Energy Efficiency, Thermal Blocks
design drawings, each HVAC zone shall be modeled as a separate thermal block. Exception: Different HVAC zones shall be allowed to be combined ...