UCS 6248 Fabric Interconnect loud fan RPM noise

Question

Hello,
Our currently installed 6248 Fabric Interconnect pair are generating a loud FAN noise.
Is there any way to reduce theirs RPM? So then can be quieter? The server room have proper air conditioning.
Some logs as bellow:
FABRIC-A(nxos)# show environment fan detail
Fan:
Module  Fan  Airflow        Speed(%)  Speed(RPM)
             Direction
1       1    Front-to-Back  60        15428
1       2    Front-to-Back  60        11065
1       3    Front-to-Back  60        14835
1       4    Front-to-Back  60        10997
2       1    Front-to-Back  60        15000
2       2    Front-to-Back  60        11134
2       3    Front-to-Back  60        14835
2       4    Front-to-Back  60        11065
Power Supply:
Module  Airflow        Configured
        Direction      Speed (%)
1       Front-to-Back  60
2       Front-to-Back  60
FABRIC-A(nxos)#
FABRIC-A(nxos)#
FABRIC-A(nxos)# show environment
Fan:
Fan             Model                Hw         Status
Chassis-1       UCS-FAN-6248UP       --         ok
Chassis-2       UCS-FAN-6248UP       --         ok
PS-1            UCS-PSU-6248UP-AC    --         ok
PS-2            UCS-PSU-6248UP-AC    --         ok
Temperature
Module   Sensor     MajorThresh   MinorThres   CurTemp     Status
                    (Celsius)     (Celsius)    (Celsius)
1        Outlet     67            58           35          ok
Power Supply:
Voltage: 12 Volts
PS  Model                Input Power       Power     Status
                         Type  (Watts)     (Amp)
1   UCS-PSU-6248UP-AC    AC     780.00     65.00     ok
2   UCS-PSU-6248UP-AC    AC     780.00     65.00     ok
Mod Model                   Power     Power       Power     Power       Status
                            Requested Requested   Allocated Allocated
                            (Watts)   (Amp)       (Watts)   (Amp)
1    UCS-FI-6248UP-SUP      492.00    41.00       492.00    41.00       powered-up
3    UCS-FI-DL2             24.00     2.00        24.00     2.00        powered-up
Power Usage Summary:
Power Supply redundancy mode:                 Redundant
Power Supply redundancy operational mode:     Redundant
Total Power Capacity                             1560.00 W
Power reserved for Supervisor(s)                  492.00 W
Power currently used by Modules                    24.00 W
Total Power Available                            1044.00 W
FABRIC-A(nxos)#

Answer 1

UPDATE
I opened a TAC, then after several reviews of the LOGs and huge sh tech files, we concluded that all was normal. This loud noise is normal   and within in normal operational ranges.
However as the server room is not fully acoustics proof and located near production  work desks, we managed to get a RMA for the fan modules for the version 2 modules which are MUCH quieter than V1 due new design.
I have upload both pictures for comparison of the designs.
Thank You!