Currently, an air change rate (0.7 h À1 ) and spring cooler installation must be considered when building an apartment house in Korea, in order to comply with the Building Standards and the Fire Service Act. In accordance with a series of legal requirements for Korean apartment houses, the improvement of the availability of ceiling space and space for working ease is required in apartments by installing a new ventilation system in the ceiling space to accommodate a spring cooler. In this study, a new ventilation system is suggested, called the ceiling plenum ventilation system. To introduce this system in the residential section of a residential-commercial complex building, a constant air volume system or combination air volume system with a 150 mm supply opening and branch duct must be used. For residential-commercial complex buildings with lower ceilings or for general apartment houses, the effective area of the supply opening of the rooms and the air supply duct at the total heat exchanger side must be increased, and a combination air volume system must be used.
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