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ANSI Denies Appeals to Revised Ventilation Rate Procedure
Jun 25, 2004
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The American National Standards Institute (ANSI) Board of Standards Review has denied appeal of an addendum to the American Society of Heating, Refrigerating and Air-Conditioning Engineers' (ASHRAE) ventilation standard.

ANSI/ASHRAE Standard 62-2001, Ventilation for Acceptable Indoor Air Quality, sets minimum ventilation rates and other requirements for commercial and institutional buildings.

Addendum 62n was approved for publication at the Society's 2003 Annual Meeting. Six appeals were filed and later denied by ASHRAE.

In a decision announced May 20, the ANSI Board of Standards Review voted to deny all appeals made to that organization, thereby upholding its earlier approval of the addendum.

The addendum revises the standard's ventilation rate procedure used to determine design ventilation rates. According to David Butler, P.E., committee chair, the procedure now is more straightforward, allowing designers to determine rates and reduce the potential for overventilation in some densely occupied spaces. Furthermore, the standard is now focused on minimum requirements.

In recognition of the fact that air pollutants are generated by building occupant activities and by the building contents, the addendum bases ventilation requirements on the number of people a space is expected to hold, as well as the space's floor area, Butler said. The "additivity" procedure is used to calculate minimum outdoor ventilation requirements for a building ventilation system.

Mr. Butler said the existing procedure, issued in 1989, contains a number of requirements that are difficult for designers to comply with and that do not allow designers to explicitly account for occupant density in a space.

To make application of the calculation methods easier for users, a spreadsheet, 62n.VRP.xls, was developed. It can be obtained under the SSPC62.1 directory at ftp.ashrae.org. Addendum 62n can be downloaded at no cost via the "standards addenda index" shortcut on ASHRAE.org.

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