ASHRAE Seeks to Withdraw ASHRAE 90.1 Addendum “cx”

The American Society of Heating, Refrigerating and Air-Conditioning Engineers Inc. (ASHRAE) has put forth a proposal to the American National Standards Institute (ANSI) to withdraw addendum “cx-2010” from the text of ASHRAE 90.1, “Energy Standard for Buildings Except Low-Rise Residential Buildings.”

According to information from the ANSI Standards Action, in which the announcement appeared on Friday, April 19, the proposed withdrawal stems from the fact that it was originally approved “pending publication of Addendum ‘bb.’” Addendum “bb” was published last January.

“Originally, Addendum ‘bb’ to 90.1 required a 30-percent Window to Wall Ratio (WWR),” writes ASHRAE. “This language allowed an exception for 40-percent window wall area path within the prescriptive Tables 5.5-1 through 5.5-8, provided continuous dimming was present.”

ASHRAE continues, “Addendum ‘cx’ was originally approved pending publication of addendum bb, which contained the 30-percent WWR requirement at the time. After appeals to addendum bb were upheld, the 30-percent WWR requirement was increased to 40 percent, and this addendum is being recommended for withdrawal.”

The public comment period opened Friday and runs through May 19. Comments should be submitted to ASHRAE’s online comment database.

Meanwhile, the glass industry continues to await news on ASHRAE 189.1, which is expected to propose a WWR of 30 percent for buildings less than 25,000 square feet. Glass Association North America (GANA) code consultant Tom Culp indicated during a recent talk at the Building Envelope Contractors (BEC) Conference that he expects the public comment period for this change to open sometime in April or May.

Stay tuned to for more on this story as it becomes available.

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