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May 2005

Good Filters, Bad Filters: What Happens When Dirty Filters Are Left in Place

Everyone knows that keeping clean filters in an air handling system is important to maintaining good indoor air quality. What everyone may not know is that leaving dirty filters in place can have an equally negative impact on indoor air quality, becoming a significant source of indoor air pollution. A recently published review of studies conducted by independent researchers throughout the last twenty years conclusively demonstrates that dirty filters are a key contributor to poor indoor air quality. The studies show that the problem was not with the filters themselves, their installation, or their location in the system, but with... Read More

What’s in Your Water?

The word legionella strikes fear into everyone associated with the building industry. For most of us, this term makes us think of cooling towers and an outbreak of pneumonia that occurred at an American Legion convention in Philadelphia in 1976. We actively monitor our HVAC systems for standing water that could lead to an outbreak. However, a team of researchers headed by Victor L. Yu, M.D., professor of medicine at the University of Pittsburgh and Chief of the Infectious Disease Department at the VA Hospital in Pittsburgh, has found that the source for most outbreaks of Legionnaires’ disease is not... Read More