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1. ·èÍ´Ñ¡·ì¨èÒÂÅÁàÂç¹ (Supply Air Duct)
2. ·èÍ´Ñ¡·ì´Ö§ÅÁ¡ÅѺ (Return Air Duct)
3. ·èÍ´Ñ¡ÊìÃкÒÂÍÒ¡ÒÈ (Exhaust Air Duct)
4. ·èÍ´Ñ¡ÊìÅÁàµÔÁÍÒ¡ÒÈ (Fresh Air Duct)