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Main Title Fungal emission reates and their impact on indoor air /
Author Foarde, Karin K. ; VanOsdell, D. W. ; Owen, M. K. ; Chang, J. C. S.
Other Authors
Author Title of a Work
VanOsdell, Douglas W.
Owen, M. Kathleen.
Chang, John C. S.
CORP Author Research Triangle Inst., Research Triangle Park, NC.;Environmental Protection Agency, Research Triangle Park, NC. Air Pollution Prevention and Control Div.
Publisher U.S. Environmental Protection Agency, Office of Research and Development, National Risk Management Research Laboratory,
Year Published 1997
Report Number EPA/600/A-98/030; EPA-R-822642
Stock Number PB98-140239
Additional Subjects Fungi ; Indoor air pollution ; Space HVAC systems ; Emissions ; Microorganisms ; Spores ; Aspergillus ; Penicillium ; Ecological concentration ; Environmental exposure ; Ducts ; Air flow ; Flow rates ; Relative humidity ; Ventilation systems ; Air pollution sources ; Air pollution monitoring ; Indoor air quality ; Mathematical models ; Emission rates
Library Call Number Additional Info Location Last
NTIS  PB98-140239 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 14 pages : illustrations ; 28 cm
The paper reports on preliminary experiments that show that fungal dissemination in air ducts has complex interactions with humidity. To replicate levels of fungal growth similar to those documented in the literature, duct materials were allowed to develop microbial (Penicillium and Aspergillus) contamination in a constant temperature and high-humidity environment. A known and constant air flow was maintained throughout. Almost no spore release was seen over 3 months of periodic sampling with constant exposure to 95% relative humidity (RH), while surface growth increased at least 2-3 orders of magnitude. After 3 months, a series of experiments was initiated to investigate the impact of RH on fungal emissions. In these, the RH was varied and culturable fungal spore emissions were measured. The level to which the RH was decreased was inversely related to increasing emissions. To better understand the implications of the spore emission rates measured in these experiments on indoor air quality (IAQ), an IAQ Model was used to estimate concentration and occupant exposure.
"EPA/600/A-98/030." "PB98-140239." "Presented at 2nd Biennial Conference, Engineering Solutions to IAQ Problems, Research Triangle Park, NC, 7/21-23/97." "John C.S. Chang, project officer." Microfiche.