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Comparison between Hospital Single Air Unit and Central Air Unit for Ventilation Performances and Airborne Microbes

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Volume: 8 | Issue: 1 | Pages: 28-36
DOI: 10.4209/aaqr.2007.04.0027
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Paradee Chuaybamroong 1, Piyapong Choomseer2, Pipat Sribenjalux3

  • 1 Department of Environmental Science, Faculty of Science and Technology, Thammasat University, Pathumthani, 12121, Thailand
  • 2 Department of Public Health, Faculty of Science and Technology, Loei Rajabhat University, Loei, 42000, Thailand
  • 3 Department of Clinical Microbiology, Faculty of Associated Medical Sciences, KhonKaen University, KhonKaen, 40002, Thailand


Ventilation performance in two units equipped with a single, hanging air conditioner having no filter, and another two units equipped with a central air conditioner with HEPA filter were compared for the air change rate, air velocity profile, and microbe concentration in a 814-bed public hospital from February to May 2006. It was found that microbe concentrations in units using a single air conditioner were about two times higher than those in central air conditioner units. Within the same type of air conditioner, increasing ventilation rate resulted in decreased microbe concentrations.


Bioaerosol Airborne microorganisms SF6 tracer gas technique Air velocity profile Hospital environment

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