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http://www.bdonline.co.uk/story.asp?sectioncode=453&storycode=3136490&c=2

Morphosis Architects’ US Federal Building in San Francisco uses concrete’s thermal mass and natural ventilation as part of its strategy to cut carbon emissions while creating a comfortable office environment

The United States Federal Building in San Francisco is one of the first major US office buildings for more than 70 years to be naturally ventilated.

Above the fifth floor this building, completed in 2007 by Morphosis Architects for the General Services Administration, is naturally ventilated, providing high-quality workspaces that require only modest quantities of primary energy to create comfortable conditions.

The exposed internal concrete structure is a vital component in achieving comfort because it provides accessible thermal mass that can store energy on a diurnal basis.

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