In order to develop combination air filters for air conditioners, 2 types of charging section were constructed. One was the wire-plate type and the other was the scroll type. Each charging section was combined with the same electrostatic polypropylene (PP) media. NaCl aerosol particles with geometric mean diameter of 0.05∼0.16㎛, geometric standard deviation of 1.6∼1.9 and total number concentration of 1,700∼24,000 particles/㎤ were used to determine collection efficiencies of the combination air filters for air conditioners with respect to particle size. It was shown that the scroll type combination air filter has greater collection efficiencies and lower pressure drops than the wire-plate type one does.

Many Korean sentences use multiple particles following the head noun, a construction known as “조사 결합” (particle combination). However, there is no unified consensus among scholars regarding the concept, classification, and constraints of Korean particle combinations. This study aims to review existing concepts and terminology related to Korean particle combinations through previous research, classify subcategories of particles, and reestablish the concepts of particle combinations and compound particles. Additionally, it selects three representative reading materials commonly used in Korean linguistics and analyzes them to categorize and organize the patterns and order of Korean particle combinations by type. This research seeks to assist learners in better understanding particle combinations and reducing errors in their usage.