ASHRAE's April 14 satellite broadcast reported that filtration systems play a strong role in combating release of biological agents, particularly anthrax and smallpox. "High quality air filtration is a major step for ensuring better protection and a more secure America," said Donald Henderson, M.D., former director of the Office of Public Health Emergency Preparedness, a federal government office created to protect the public from acts of bioterrorism and other health emergencies. More than 20,000 viewers at some 1,000 sites watched the broadcast, which was hosted by the ASHRAE Presidential Ad Hoc Committee on Homeland Security and funded through a grant from the Alfred P. Sloan Foundation in New York. More information about ASHRAE's work in homeland security, including free reports, can be found via at www.ashrae.org/homelandsecurity.