Updated ASHRAE Ventilation standard 62 published

ASHRAE Standard 62.1-2004, Ventilation for Acceptable Indoor Air Quality, contains key changes from the 2001 standard. The standard specifies minimum ventilation rates and indoor air quality requirements for commercial and institutional buildings. The 2004 standard incorporates 17 addenda among which the major change is the revision of the Ventilation Rate Procedure to reflect recent information regarding ventilation impacts on indoor air quality and to clarify the adjustments necessary for space air distribution and system efficiency of multi-zone recirculating systems. The standard also contains new requirements for building components and building systems and the IAQ Procedure was modified by converting the material in the standard into requirements that are stated in mandatory and enforceable language. A new informative appendix, entitled Application and Compliance, provides guidance on when the standard applies to new and existing buildings.