Each of the building's air-handling systems use an aerodynamic and aeroacoustic fan system (Compact(tm) Space Fan Systems from M&I Air Systems Engineering, a division of M&I Heat Transfer Products Ltd.). In all, Buildings A, B, C, D, and J on the Immunex campus house 22 supply units and five return units that use unique aerodynamic inlet and outlet configurations. The supply units range in capacity from 30,000 cfm to 51,000 cfm.
These inlet units gradually accelerate the intake air to the fans' annular velocity without generating turbulence or flow separation. They deliver the air perpendicular to the fans' annulus areas and are designed to minimize impact losses at the fans' hubs.