This prerequisite requires the designer to meet the minimum requirements of ASHRAE 62-1999 and "approved addenda," with a reference to ASHRAE 62-2001 Appendix H. The credit also requires the designer use the Ventilation Rate Procedure. Our specific question is whether or not the use of the current standard, ASHRAE 62-2004, is acceptable. In general, further clarification of LEED\'s stance on the use of newer ASHRAE standards would be very helpful as this debate also extends to ASHRAE 90.1-1999 versus ASHRAE 90.1-2004. In other CIR\'s we have read that newer standards/codes are acceptable if they are "more stringent". ASHRAE 62-2004 is significantly different than the 1999 version, and slightly different than the 2001 version. In 2004 the ventilation rate is based on a combination of an area value and a per-person value. In our experience the total ventilation rate per 2004 is typically lower than the rate calculated with 1999. This is more "stringent" in regards to energy conservation and in many cases results in a significant reduction in energy consumption. However, strictly in terms of IAQ some may view this standard as less stringent compared to 1999. It is our opinion that ASHRAE has done sufficient research to assure the health of building occupants and good indoor air quality, while at the same time balancing energy consumption. To keep current with the recent research findings we hope that LEED would accept the current ASHRAE standards across the board as they complete their public review process and are published. If not, it would be helpful if a list of accepted and rejected standards was made available and kept current on the website.