Abstract
Ultrafine particles (UFPs) are produced by human activities in outdoor and indoor environments. It is important to control indoor UFPs for their health effects on human and long duration that people spend indoors. Filtration is important in mechanical ventilation system for UFP removal to reduce human exposure to UFPs. The filtration efficiency for particle removal depends on particle diameter. Thus, we selected nine respective filters and their combinations to measure size-dependent efficiencies for UFP removal and the pressure drops. The 4th-order polynomial equations were developed from fitting results. The total efficiencies for UFP removal were estimated based on the polynomial equations and the measured size distributions of ambient UFPs. The total efficiencies for UFP removal and pressure drops of combinations of fine filters are comparable to those of a single HEPA filter. The application of combinations of fine filters needs further study in the future. The filtration efficiencies of these filters are relatively low, which may be caused by the lack of good tightness and need to be improved in the future.
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