The addition of air curtains in the International Green Construction Code (IgCC), the new comprehensive high performance green building code, promises energy and construction cost savings for commercial, industrial and institutional buildings.
Specifying air curtains as energy-saving, cost-cutting alternatives to vestibules in 3,000-square-foot buildings and larger has been a recent trend among consulting engineers and architects. However, many times specifications are blocked by local jurisdictions that have adopted the International Energy Construction Code (IECC), which doesn't yet sight air curtains as vestibule alternatives.
Thus, the newly-enacted IgCC, which is scheduled for March 2012 publishing, now provides an approved overlay of green construction products to the base code IECC, which is overseen by the International Code Council, the Washington-based organization responsible for providing minimum safety, sustainability and affordability building codes and standards.
Recent proposals to the IgCC by the Air Movement and Control Association International (AMCA), Arlington Heights, Ill., helped establish air curtains as a vestibule alternative with the stipulation that they're tested in accordance with ANSI/AMCA Standard 220-05, "Laboratory Methods of Testing Air Curtains for Aerodynamics Performance Ratings."
Also helpful in the code modification effort were recent studies proving air curtains as 10% more energy-efficient than vestibules. The three-month research study “Air Curtains: A Proven Alternative to Vestibule Design” used second-party validation from research/validation consultant, Blue Ridge Numerics, Charlottesville, Va., with certified results from proven computational fluid dynamics (CFD) analysis.
Besides energy savings, vestibules, especially in retail settings, consume anywhere from 25 to 250 square feet of usable retail space and carry construction costs ranging from $3,750 to $37,500, based on an average of $150/square feet construction costs.
Meanwhile air curtain proponents will continue to present energy efficiency data to code committees, in hopes of instituting the vestibule alternative measure into the IECC. The next meeting on the subject is scheduled in January 2013.
Related Stories
| Feb 15, 2011
Iconic TWA terminal may reopen as a boutique hotel
The Port Authority of New York and New Jersey hopes to squeeze a hotel with about 150 rooms in the space between the old TWA terminal and the new JetBlue building. The old TWA terminal would serve as an entry to the hotel and hotel lobby, which would also contain restaurants and shops.
| Feb 15, 2011
New Orleans' rebuilt public housing architecture gets mixed reviews
The architecture of New Orleans’ new public housing is awash with optimism about how urban-design will improve residents' lives—but the changes are based on the idealism of an earlier era that’s being erased and revised.
| Feb 15, 2011
LAUSD commissions innovative prefab prototypes for future building
The LA Unified School District, under the leadership of a new facilities director, reversed course regarding prototypes for its new schools and engaged architects to create compelling kit-of-parts schemes that are largely prefabricated.
| Feb 15, 2011
New 2030 Challenge to include carbon footprint of building materials and products
Architecture 2030 has just broadened the scope of its 2030 Challenge, issuing an additional challenge regarding the climate impact of building products. The 2030 Challenge for Products aims to reduce the embodied carbon (meaning the carbon emissions equivalent) of building products 50% by 2030.
| Feb 15, 2011
New Urbanist Andrés Duany: We need a LEED Brown rating
Andrés Duany advocates a "LEED Brown" rating that would give contractors credit for using traditional but low cost measures that are not easy to quantify or certify. He described these steps as "the original green," and "what we did when we didn't have money." Ostensibly, LEED Brown would be in addition to the current Silver, Gold and Platinum ratings.
| Feb 15, 2011
AIA on President Obama's proposed $1 billion investment in energy conservation
The President’s budget increases the value of investment in energy conservation in commercial buildings by roughly $1 billion, reports AIA 2011 President Clark Manus, FAIA. The significant increase from the current tax deduction of $1.80 per sq. ft. now on the books is an increase for which the AIA has been advocating in order to encourage energy conservation.
| Feb 14, 2011
Sustainable Roofing: A Whole-Building Approach
According to sustainability experts, the first step toward designing an energy-efficient roofing system is to see roof materials and systems as an integral component of the enclosure and the building as a whole. Earn 1.0 AIA/CES learning units by studying this article and successfully completing the online exam.
| Feb 11, 2011
Four Products That Stand Up to Hurricanes
What do a panelized wall system, a newly developed roof hatch, spray polyurethane foam, and a custom-made curtain wall have in common? They’ve been extensively researched and tested for their ability to take abuse from the likes of Hurricane Katrina.
