The MRCOOL DUCT-09HP-230 Olympus 9K BTU 3/4 Ton Multi-Zone Ductless Mini Split Air Handler is a compact concealed indoor unit designed for use with compatible MRCOOL Olympus multi-zone ductless mini-split heat pump systems. It works by circulating conditioned air through short duct runs, delivering consistent heating and cooling while maintaining a discreet appearance. https://www.partshnc.com/mrcool-olympus-multi-zone-ductless-mini-split-air-handler-duct-09hp-230