The effect of air leakage through the moisture damaged structures in a school building having mechanical exhaust ventilation
Backman, E., Hyv?rinen, M., Lindberg, R., Reiman, M., Seuri, M. and Kokotti, H.
2000 Proceedings of Healthy Buildings, Vol. 3, pp. 141-145
Backman, E., Hyv?rinen, M., Lindberg, R., Reiman, M., Seuri, M. and Kokotti, H., (2000), "The effect of air leakage through the moisture damaged structures in a school building having mechanical exhaust ventilation", Proceedings of Healthy Buildings, Vol. 3, pp. 141-145.
Abstract:
Seven of the sixteen workers complained stuffy air, unpleasant odor and dustiness. Fatigue and nasal irritation were the most frequently observed symptoms. The carbon dioxide concentration reached the worst category S3 in the Finnish classification of indoor climate [2]. Indoor relative humidity and temperature conditions varied in the range of 18oC-23oC and 15%-30% in a school building. The exhaust air flows fell 21%- 61% below the category S3 in the classification. The reason for the low air flows was that the workers had complained dra ught and low indoor temperature during the more effective ventilation.
The same moisture indicating microbes (Aspergillus versicolor and Trichoderma) were found both in the pipe channel and in the indoor air sample of the overlying classroom. Also the microbe samples which were wiped from the surfaces of the joint and the classroom included the same species. Thus, the expansion joint and the pipe channel were observed to be the potential source of microbes. The significance of the former sources as a cause of indoor air problems was increased by the inadequate mechanical exhaust ventilation system, which depressurized classroom s and caused air leakage from and through damaged structures.
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