Air Turbine originally had an existing DOS based fan selection and pricing program that would no longer work on Windows 7 (remember that version after Windows 98?).
BCA Technologies converted the old VB6 code to a .NET DLL and changed much of the data from hard-coded to data driven. eRep is now used by their internal sales, OEM Partners, distributors, and independent sales reps to select fans based on design performance and price.