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Thermally powered VAV diffusers historically have been used in retrofits to provide additional zoning for existing systems. The Kaiser Geary Medical Office Building in San Francisco is the first significant new building in the United States to use thermally powered VAV diffusers as the basis of design. An improved direct digital control (DDC) approach for reheat control was developed, and a prototype tested at the factory before construction commenced.

Citation: ASHRAE Journal, Vol.47, No.12