Air passageway is a term used to describe the system of vents, ducts, and intakes that allow air to flow through a building or structure. VENT is a four letter word meaning an opening in a wall or roof that allows air to enter or escape. DUCT is also a four letter word meaning a tube or conduit for conveying air, heat, or liquids. Intake is a six letter word meaning the act of taking something in, such as air or water. Together, these three words form the term air passageway, which describes the system of vents, ducts, and intakes that allow air to flow through a building or structure.