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ASHRAE Updates Ventilation Standard
Jan 13, 2005
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The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) has updated its 2004 ventilation standard. ANSI/ASHRAE Standard 62.1-2004, Ventilation for Acceptable Indoor Air Quality, specifies minimum ventilation rates and indoor air quality (IAQ) requirements for commercial and institutional buildings.

"While the purpose of the standard has remained consistent since it was first published in 1973, the means of achieving the goal of providing acceptable indoor air quality have evolved," David Butler, chair of the Standard 62.1 committee, said. "The 2004 standard provides users with better tools to help get the job done."

Changes include a 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 breathing zone ventilation rate now includes both an area-related component and an occupant-density-related component, which are added together to determine the required ventilation for the space, Mr. Butler said.

The standard also includes a new informative appendix, Appendix G, Application and Compliance, which provides guidance on when the standard applies to new and existing buildings. It contains a code-intended language version that could be adopted by jurisdictions that have not adopted a building code.

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