In a ductable AC, the conditioned air from the indoor unit is passed into the room using circular/ oval/ rectangular ducting. Ducting is fabricated either using galvanised steel or pre-insulated boards, or fabric.

A ductable AC is normally installed either above the conditioned room or outside. Return air is collected from the room and is passed back to the air conditioner. The space where the air is conditioned and the room are always kept air tight except for some measured volume of fresh air which is needed based on defined ventilation standards.