Codes & Standards

The American Society of Heating, Refrigerating and Air-Conditioning Engineers (ASHRAE) recently announced that 14 proposed addenda to ANSI/ASHRAE/IESNA Standard 90.1, Energy Standard for Buildings Except Low-Rise Residential Buildings, are open for public comment.

Open for public comment until Oct. 14 are:

  • Addendum h, which addresses any conflict with ASHRAE Standard 55-2004, Thermal Environmental Conditions for Human Occupancy, and ANSI/ASHRAE Standard 62.1-2007, Ventilation for Acceptable Indoor Air Quality, and takes advantage of the energy-saving potential of direct digital controls.
  • Addendum j, which updates mechanical test procedures and references.
  • Addendum n, which extends variable-air-volume-fan requirements for large single-zone units, effective in 2012.
  • Addendum q, which modifies vestibule requirements for Climate Zone 4.

Open for public comment until Oct. 29 are:

  • Addendum d, which modifies requirements in both the lighting and envelope sections to better allow daylighting.
  • Addendum f, which expands roof requirements to include cool roofs.
  • Addendum g, which updates metal-building-envelope criteria.
  • Addendum i, which applies a four-zone lighting-power-density approach to exterior-lighting requirements.
  • Addendum k, which revises tables 6.8.1E and 7.8 to identify specific sections of referenced standards, reflects federal residential-water-heater efficiency levels, and adds a requirement for electric tabletop water heaters.
  • Addendum l, which adds minimum efficiency and certification requirements for both axial- and centrifugal-fan closed-circuit cooling towers and adds a reference to the Cooling Technology Institute test standard for closed-circuit cooling towers.
  • Addendum m, which establishes, effective Jan. 1, 2010, an additional path of compliance for water-cooled chillers.
  • Addendum o, which adds requirements for low-voltage dry-type transformers.
  • Addendum p, which provides pressure credits for laboratory exhaust systems.
  • Addendum r, which changes the performance-rating method in Appendix G from informative to normative, or required.

To read and comment on any of the addenda above, visit during the public-comment periods.

In other news, ASHRAE recently announced the publication of:

  • ANSI/ASHRAE Standard 34-2007, Designation and Safety Classification of Refrigerants, which contains 16 new refrigerants, a revised flammability classification, revised flammability- and fractionation-testing procedures, and a new section with recommended refrigerant-concentration limits.

  • ANSI/ASHRAE Standard 15-2007, Safety Standard for Refrigeration Systems, which expands requirements for internal relief devices and includes an updated Appendix F, which covers relief-device selection for positive-displacement compressors.

  • ANSI/ASHRAE Standard 62.1-2007, Ventilation for Acceptable Indoor Air Quality, which includes requirements for the separation of smoking areas from no-smoking ones and provides a specific, easy-to-establish load condition for the analysis of a mechanical cooling system's ability to limit space relative humidity. Additionally, minimum outdoor-air requirements for residences in buildings more than three stories tall and several occupancy categories were added to Table 6-1.

  • ANSI/ASHRAE/ACCA Standard 183-2007, Peak Cooling and Heating Load Calculations in Buildings Except Low-Rise Residential Buildings.

To order any of the published standards above, call 800-527-4723 (United States and Canada) or 404-636-8400, or visit the bookstore at

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