ASHRAE Standard 62-1999, Ventilation For Acceptable Indoor Air Quality

A building code requires that outdoor air ventilation rates comply with ASHRAE 62 (latest version). A designer has designed per ASHRAE 62-1989, multi-unit smoking-permitted restaurants. For the patron section of a restaurant having an occupancy of 200 people, the ventilation rate is 200 people x 20 cfm/person = 4000 cfm. The designer now has a job for another nearly identical restaurant unit located in a geographic area covered by the aforementioned code. Addendum e removed the statement from Table 2 that ventilation rates accommodate “a moderate amount of smoke”. Now it is unclear whether or not the Ventilation Rate Procedure of Section 6.1 of ASHRAE Standard 62-1999, utilizing Table 2, can now be used to calculate ventilation rates for multi-unit smoking-permitted restaurants.