Abstract
A reversed cross-over intervention study has been performed to investigate if ventilation through commonly used ba filter and alternative ventilation bag filter with activated charcoal lining, leads to a perceptible difference in perceived air quality in a hospital office working environment. Filter banks of two types of filters were used for ten months in two different air-handling-units in the same building at the same period of time. An untrained blind panel of about 25 students assessed perceived air quality (PAQ) in different rooms ventilated by the two air-handling-units three times. The filter banks were changed between the air-handling-units between the assessments. The result indicates that the alternative filter reduce the sensory pollution problems caused by commonly used ventilation bag filters. However, this effect was not consistently perceptible in all assessment rooms, indication that this presumed effect is diluted and dominated by factors in a hospital office working environment.
