Ceiling Concealed AC

The concealed ducted split system is an invisible HVAC option, where the indoor air handler is hidden in the ceiling or the attic with visible small vents in the assigned area. The system ducts are invisible, it distributes air through the ceiling or wall vents. cassette air conditioner (plural cassette air conditioners) A ceiling- or wall-mounted or suspended air conditioner, for when space is limited, because there is no available walls to mount a split system or where there is limited ceiling space for a ducted system.