Proper ventilation is essential for maintaining good indoor air quality, yet it places an additional burden on heating and cooling equipment, which must condition air that will soon be exhausted from the building. Fortunately, energy recovery ventilation systems can help ameliorate this problem.

The President’s Council of Advisors on Science projected that H1N1 flu might cause up to 90,000 deaths this season. Is deploying ultraviolet (UV) lights in HVAC supply air ducts a useful tool to reduce the spread of the virus in office buildings, and does UV deliver other benefits?