CHICAGO - ASHRAE will move forward with publication of an addendum to its ventilation standard.

CHICAGO - The American Society of Heating, Refrigerating and Air-Conditioning Engineers will move forward with publication of an addendum to its ventilation standard that will make the standard's requirements apply only to nonsmoking spaces and provide new design guidance for controlling odor in indoor spaces where smoking occurs.

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

The design guidance in addendum 62o deals with the use of ventilation to control odors from tobacco smoke but does not discuss health effects. It was approved for publication at ASHRAE's 2002 Annual Meeting, and six appeals later were filed. ASHRAE denied the appeals at its 2003 Winter Meeting.

Addendum 62o deletes smoking lounges from a table on outdoor air requirements for ventilation. In the same table, the requirements in spaces where smoking is assumed to occur have been lowered, and a footnote is added explaining that the table applies to no-smoking areas, according to Andrew Persily, chair of the 62 committee.

In addition, the addendum addresses ventilation in smoking areas by requiring these areas to have more ventilation and air cleaning than comparable nonsmoking areas.

Addendum 62o also provides a method to allow designers to determine the additional ventilation over what would be provided in a similar nonsmoking area for the purpose of odor control only, according to Persily.

Typically, the increase in ventilation is about 10 to 40 cfm per person over the nonsmoking rate in spaces without heavy smoking, he said. The actual increase will depend on the smoking rate and occupancy density of the specific space.

The guidance is provided as information only in an appendix that accompanies the standard and is not required for compliance.