The American National Standards Institute (ANSI) has opened a public comment period for the latest revisions to ASHRAE 90.1-2010, Energy Standard for Buildings Except Low-Rise Residential Buildings. The latest version of the standard was released last week, and the public comment period for these changes runs through April 21.

Among the changes is a proposal to adapt Addendum “da”’s section, “Fenestration and Doors,” to add a section related to nonswinging doors. The section would specify that air leakage shall not exceed “1.3 cfm/ft2 (23.8 m3/h x m2) for nonswinging doors intended for vehicular access and material transportation, with a minimum opening rate of 32 inches per second, tested at a pressure of at least 1.57 pounds per square foot (psf) (75 Pa) or higher in accordance with ANSI/DASMA 105, NFRC 400 or ASTM E283.”

Additionally, an exception for “products in buildings that comply with a whole building air leakage rate of 0.4 cfm/ft2 under a pressure differential of 0.3 in w.g. (1.57 psf)(2 L/s x m2 at 75Pa) when tested in accordance with ASTM E 779,” would be added to Addendum “da” if the changes are accepted.

Most of the changes, however, are related to “direct digital control (DDC) for certain applications in both new buildings and retrofits where it can be considered cost-effective,” according to the announcement from ANSI. “It also defines the minimum capability of mandated DDC systems,” writes ANSI.

Comments can be submitted online by clicking here.

In response to the latest 90.1 addendum changes, Tom Culp of Birch Point Consulting LLC, code consultant for the Glass Association of North America (GANA), says, “I don’t think there is a major story this instant, but there will be a major issue next month when another attack on glazing area will go out for public review.”

Culp spoke about ASHRAE 90.1, along with several other energy codes, during the recent Building Envelope Contractors (BEC) Conference in Las Vegas.

At that time, he noted that the glass industry was successful in 2009-2010 in overturning the ASHRAE 90.1 proposal to reduce prescriptive glazing area by 25 percent, from 40 to 30 percent, but noted another item to look out for is ASHRAE 189.1.

“The battle has returned in ASHRAE 189.1, which is proposing the same thing but for buildings less than 25,000 square feet,” said Culp.

Stay tuned to™ for more as this story develops.