The Manual D procedures match duct system resistance (pressure drop) to blower performance (as defined by the HVAC system manufacturer’s blower performance tables). This delivers appropriate airflow to the rooms and spaces to be conditioned while ensuring that system airflow is compatible with the operating range of the HVAC equipment.

The Commonwealth of Virginia will leverage the two standards to promote greater uniformity with existing statewide programs across the country.

 Held this year in Dubai, COP28 took place from November 30 through December 12.

The 2018-IgCC combines the technical requirements developed by the ASHRAE Standard 189.1 with the model code administrative provisions by the Code Council. As a result, the 2018-IgCC is now a unified code that emphasizes adoption, ease of use and enforcement for building projects.