ATLANTA - The first step in complying with the American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) 2004 ventilation standard is learning how. ASHRAE will aid users in this effort by offering the seminar "How to Comply with ASHRAE 62.1-2004" at its 2005 Winter Meeting.

"We will walk through the entire standard one section at a time to enable users to better understand the changes that have occurred and the rationale behind those changes," Eli Howard, who will chair the seminar, said. "This seminar will enable a better understanding of the standard and guidance for applying it to their designs."

The seminar will be held from 10:15 a.m.-12:15 p.m. on Wednesday, Feb. 9. The seminar is part of the technical program at the winter meeting, scheduled for Feb. 5-9 in Orlando, Fla.

The seminar will feature an overview of the requirements of the 2004 standard with emphasis on the new requirements. ASHRAE 62.1-2004, "Ventilation for Acceptable Indoor Air Quality," contains a number of changes from the 2001 standard.

The 2004 standard incorporates more than 15 addenda created via continuous maintenance. The methodology for calculating ventilation rates for buildings is fundamentally changed for the first time in 15 years, according to Howard, of the Sheet Metal and Air Conditioning Contractors' National Association (SMACNA). The standard also contains new requirements for building components and building systems.

Andy Persily, Ph.D., National Institute of Standards and Technology, Gaithersburg, Md., will provide an introduction and overview of the standard. He will discuss the outdoor air quality assessment, the indoor air quality procedure and appendices (normative vs. informative).

"The new outdoor air quality assessment clarifies what one must do with respect to evaluating outdoor air quality, which is much clearer than in the 2001 standard," he said. "In addition, the new indoor air quality procedure uses mandatory/enforceable language, making it much clearer on how one can comply with this alternative, performance based procedure."

Dennis Stanke, Trane, La Crosse, Wis., will discuss multiple-zone systems and other adjustments, including how to calculate the required outdoor air intake flow for constant volume reheat, single-duct VAV, and fan-powered VAV systems; and how to find default system ventilation efficiency; and calculating system ventilation efficiency using the equations from the appendix.

"For a single-duct VAV system example, I'll show what happens to ventilation requirements at both design and part load and show that some form of dynamic reset be employed to save operating cost without sacrificing proper ventilation," he said.

Other presentations include:

  • "Ventilation Rate Procedure," by Lynn Bellenger, P.E., Pathfinder Engineers LLP, Pittsford, N.Y. She will discuss the calculation methods in the procedure, zone air distribution effectiveness, and system ventilation efficiency.

  • "Equipment and Building Requirements," by Hoy Bohanon, P.E., Bohanon Engineering, PLLC, Clemmons, N.C. He also will discuss exhaust requirements, classes of air, filtration requirements, coil design, humidity control, building envelope, construction, O&M, and normative appendices.

    For more information on the 2005 ASHRAE Winter Meeting or to register, visit

    Publication date: 12/13/2004