The Center for the Built Environment (CBE) at the University of California, Berkeley, has launched its Underfloor Air Technology Website at www.cbe.berkeley.edu/underfloorair. The purpose of the website is to provide a complete description of underfloor air distribution (UFAD) and related technologies. The site is aimed at a broad audience and includes technical overviews explaining key issues, benefits and limitations; graphical tools highlighting basic concepts; detailed research summaries and publications; design guidelines for applying the technology; case studies of existing systems; and UFAD glossary and FAQs.