Effect of ultraviolet germicidal lights installed in office ventilation systems on workers' health and well-being: Double-blind, multiple crossover trial
2003
The Lancet
Journal Article
Issue 9398
Volume 362
Pages 1785-1790
Author(s): Menzies, D., Popa, J., Hanley, J.A., Rand, T., Milton, D. K.
Most commercial buildings in North America are mechanically ventilated with sealed exterior shells. In this type of highly automatically controlled indoor environment, microbial contamination of the HVAC system often contributes to building-related illness and symptoms in building occupants, such as outbreaks of rhinitis, humidifier fever, asthma, hypersensitivity problems, and so on. Contamination of bacteria, fungi, and protozoa has been found on various parts of HVAC systems such as air cooling units, cooling coils, and drip pans.
Added October 2012
Impact of Environmental Factors on Efficacy of Upper-Room Air Ultraviolet Germicidal Irradiation for Inactivating Airborne Mycobacteria
2005
Environmental ScienceTechnology
Journal Article
Issue 24
Volume 39
Pages 9656-9664
Author(s): Xu, P., Kujundzic, E., Peccia, J., Schafer, M., Moss, G., Hernandez, M., Miller, S.
Hospitals are high exposure environments where transmission of infectious diseases is a large concern. To prevent this Ultraviolet Germicidal Irradiation (UVGI) systems are used as an engineering control. A common application is upper-room irradiation for which germicidal lamps are suspended from ceilings/ attached to walls, while the bottom of the lamps are shielded to direct radiation. The principle is to maximize UV radiation exposure to airborne microorganisms in the upper part of the room while minimizing radiation exposure to patients in the lower part.
Added October 2012
