An air handling unit for use with a heating, ventilating, and air conditioning (HVAC) system includes an air input portion configured to receive conditioned air. The air handling unit also includes an air output portion configured to direct the conditioned air to an interior space of a structure. The air handling unit further includes a routing portion configured to couple the air input portion to the air output portion in fluid communication. The routing portion also includes a contouring structure configured to interface with the structure.