An occupancy sensor system in a lab building can throttle down VAV exhaust for fume hoods in unoccupied labs to save hundreds of thousands of dollars a year in energy bills while still meeting codes and safety regulations. Researchers are in their labs only 34% of the time, so there is a lot of unoccupied time.

- From Tradeline's 2006 Summit on Facilities for the Emerging Sciences.

What is VAV?