Journal of Medical Microbiology and Immunology Research

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Fungal Spore Collection

The collection of fungal spores on ventilation filters was compared with the collection and retraining of standard test particles, and their potential for subsequent retrain. Particles of potassium chloride (KCl) have been selected as normal test particles, as recommended by ASHRAE Standard 52.2 Selected to represent common fungal spores in indoor air were Penicillium brevicompactum and Penicillium melinii. Two widely used filters were tested: a low-efficiency filter medium A from a prefilter and a fine filter with a higher efficiency medium B. The collection efficiency for fungal spores was found to be slightly lower than for the same aerodynamic-sized KCl particles. The different surface structure of these spores may explain the higher reentrainment rate of P. melinii compared to that of P. brevicompactum. The results suggest that re-entraining of fungal spores may be significant during startup of a ventilation system or during other operations when the air velocity may suddenly increase. In addition, if fungal spores on the ventilation filters grow, the rate of reentrainment may be even higher than that measured in this study.

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