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冷气机是空调系统主要组成部份。中央空调及大型建筑物皆采用冷气机。特别在美国和欧洲。此外，小型及中型商用冷气机多采用冷冻液直接扩散的柜式装置和 ＤＸ－Ｍｕｌｔｉ系统。ＤＸ－ｎｏｎ－ｄｕｃｔｅｄ（直接扩散非管道）系统主要用于日本，这类装置可减少板金工人或管道安
Air conditioners are the main components of air conditioning systems. Central air conditioning and large buildings are using air-conditioners. Especially in the United States and Europe. In addition, small and medium-sized commercial air-conditioners often use direct-flow chilled liquid cabinet units and DX-Multi systems. DX-non-ducted (Direct Diffused Non-Ducted) systems are mainly used in Japan, which reduce the need for sheet metal workers or plumbing