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Access this article Similar content being viewed by others Abbreviations A: Effective collection area, m 2 C: Concentration, g/m 3 CADR: Clean air delivery rate, m 3 /h Cu: Cunningham slip correction factor, - E c : Electric field strength, V/m E c *: Modified electric field strength, V/m K : Ion charge coefficient, - Q : Volumetric airflow rate, m 3 /h V+: Positive voltage applied to ionizer, V V- : Negative voltage applied to ionizer, V d p : Positive voltage applied to ionizer, V k: Concentration decay rate, 1/h n p : Number of charges per particle, - n p *: Effective ion concentration including K coefficient, ions/cm 3 w: Particle migration velocity, m/s : Incorporation of ionizer-filter interaction factor, - : Mean free path of air molecules, m : Dynamic viscosity of air, Pas i : Particle removal efficiency by ionizer, - i *: Modified particle removal efficiency by ionizer, - f : Particle removal efficiency by filter, - total : Combined removal efficiency with ionizer and filter, - f: Filter i : Ionizer total: Combined total with ionizer and filter est: Estimated value exp: Experimental value particle: Particle filter PM2.5: High-efficiency PM2.5 filte single: Single polarity ionization both: Dual polarity ionization both (+) and (-) ion References Abi-Esber, L., & El-Fadel, M

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