Abstract: An in-structure air delivery system comprises a control panel and a plurality of air delivery lines. The control panel is located at a first location in the structure and has an air supply inlet. Each air delivery line extends from the control panel to a different location in the structure. Valves are configured to selectively control the flow of air through each of the air delivery lines. In a method of use, a high pressure air supply such as a portable compressor is connected to the inlet of the system. Air is selectively delivered to one or more of the delivery lines. A control unit is connected to the outlet of the delivery line. Air is supplied to the control unit. The control unit is used to regulate the flow of air to a component of breathing equipment, such as to a firefighter's breathing equipment air cylinder to be re-filled.