In Xona nomenclature, the first set of numbers refer to the mass flow in lbs/min.  For example, an XR6564S has a 65lb/min flow rate.  The second set of numbers indicates the turbine discharge in mm, in this case 64mm turbine discharge.  The “S” indicates that the turbine is the UHF wheel aero.


XR Dimensional Drawings


Xona Bearing Preload System


UHF Turbine Wheel