The addendum provides a method that allows designers to determine additional ventilation (over what would be provided in a similar nonsmoking area), according to Andrew Persily, chair of the 62 committee.

The increase in ventilation is typically about 10 to 40 cfm/person over the nonsmoking rate in spaces without heavy smoking, he said. Naturally, the actual increase depends on the smoking rate and occupancy density of the specific space.

The addendum does give the standard a little more enforceable bite. For example, it requires smoking areas to have more ventilation and air cleaning than comparable nonsmoking areas.

The section notes that “Specific ventilation rate requirements cannot be determined until cognizant authorities determine the concentration of smoke that achieves an acceptable level of risk.”

The section also states that air from smoking areas “shall not be recirculated or transferred to no-smoking areas,” Persily said.

Finally, there seems to have been a trade-off: 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 has been added explaining that the table applies to no-smoking areas, according to Persily.

The addendum is subject to a 15-day appeals period to the board of directors. Published addenda to ASHRAE standards are available for free at ASHRAE Online, www.ashrae.org (website).

Publication date: 07/15/2002