LO-09-045 — Biological and Metal Contaminants in HVAC Filter Dust
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- ASHRAE
Recently, the interaction between particles retained on HVAC filters and indoor air quality has gained more attention due to their possible relationship to irritation, health outcomes, and odors. This paper focuses on microbial contaminants and metals captured on HVAC filters in nine residential and light-commercial buildings. Culturable fungi and bacteria populations captured in the dust were quantified using standard spread plate methods and heavy metal (Pb, As, Cd) concentrations were determined by atomic absorption spectroscopy. Culturable fungal and fungal spore concentrations ranged from 104 to 106 and from 102 to 103 CFU/g, respectively, while culturable bacteria and bacterial spore concentrations ranged from 105–107 and 103–105 CFU/g, respectively. Microbial concentrations were consistent across filters having different efficiencies with median concentrations within one order of magnitude. Heavy metal concentrations were as high as 29 µg/g for lead, 6 µg/g for cadmium, and 7 µg/g for arsenic. Variations observed in the metal concentrations between different dust samples may be due to particle size differences related to different filter efficiencies and indoor sources. This investigation provides insight into possible metal sources and concentrations of biological and heavy metal contaminants present in indoor environments.
Units: Dual
Citation: ASHRAE Transactions, vol. 115, pt. 2, Louisville 2009
Product Details
- Published:
- 2009
- Number of Pages:
- 8
- File Size:
- 1 file , 270 KB
- Product Code(s):
- D-LO-09-045
