ASHRAE Standard 62.1-2004: Ventilation Rate Procedure*

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*Approved by AIA and USGBC (LEED) for continuing education credit. In the 2004 version of ASHRAE Standard 62.1, the entire Ventilation Rate Procedure (VRP) has been revamped. This procedure is used to determine the minimum ventilation requirements for commercial, institutional, and high-rise residential buildings.


The new VRP changes the requirements for breathing-zone and system-intake ventilation airflow by better accounting for the 'additivity' of contaminants from different sources (people vs. building). It also details system ventilation efficiency for multiple-zone systems. This ENL takes a detailed look at the design and operation of various ventilation systems and their compliance with the new requirements.