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THE EFFECT OF VENTILATION AND RELATIVE HUMIDITY UPON AIRBORNE BACTERIA IN SCHOOLS.

Author(s) : GREEN G. H., SAREEN K., OSBORNE A. D.

Summary

THE PAPER REPORTS THE EFFECT OF VENTILATION AND RELATIVE HUMIDITY UPON THE NUMBER OF AIRBORNE COLONY-FORMING UNITS PER M3 (CFU/M3 ) IN SIX SCHOOLS. THE AIRBORNE BACTERIA FOUND WERE MAINLY NONPATHOGENIC. THE NUMBER OF CFU/M3 WERE MAINLY A FUNCTION OF OCCUPANCY: IN NONOCCUPIED PERIODS, THE NUMBERS OF CFU/M3 WERE IN THE RANGE OF 40 TO 70, WHICH INCREASED TO 300 TO 700 AS SOON AS THE STUDENTS ENTERED THE CLASSROOM. THE AVERAGE LEVEL OF THE CFU/M3 WAS LARGELY A FUNCTION OF THE AIR RECIRCULATION RATE. ORDINARY FILTERS ARE VERY EFFECTIVE IN REMOVING BACTERIA. THE NUMBER OF CLASSROOM AIRBORNE BACTERIA WAS REDUCED SLIGHTLY AS THE REALTIVE HUMIDITY DECREASED. THEY WERE, HOWEVER, MAINLY NONPATHOGENIC, AND THE PATHOGENS MAY HAVE A DIFFERENT SURVIVAL PATTERN WITH RELATIVE HUMIDITY.

Details

  • Original title: THE EFFECT OF VENTILATION AND RELATIVE HUMIDITY UPON AIRBORNE BACTERIA IN SCHOOLS.
  • Record ID : 1986-2437
  • Languages: English
  • Publication date: 1985
  • Source: Source: ASHRAE Trans.
    vol. 91; n. 2A; 13-28; 11 fig.; 6 tabl.; 23 ref.; discuss.
  • Document available for consultation in the library of the IIR headquarters only.

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