ABSTRACT
The performance of the electronic-filter air purifier that uses the principle of electrostatic field on airborne fungi(Aspergillus niger and Penicillium citrinum) and bacteria (Staphylococcus epidermidis and Bacillus subtilis)removals was tested in this study. The experiment was conducted in the 8-m3 chamber by injecting each type ofmicroorganism and sampling the bioaerosol at two height levels, 0.5 and 1.5 m. Since the air purifier was locatedat the floor with the height of 0.67 m, the microbe concentrations at these two height levels were observed for anydifference in its performance. However, the main objective was to compare the microbe concentrations whenturning on the air purifier and turning off for duration of 4 hours. The results were that the air purifier could removethe microbes from the initial concentrations of 34,000 - 80,000 cfu/m3 to comply with the recommended concentrationof 500 cfu/m3 within 30-40 min except for B. subtilis that needed longer time. The height level did not affectthe performance of the air purifier in this study at the level of confidence of 99 %.