Hi All,

We have deployed few S4148T running OS10 in the datacenter. I recently noticed "fail" from the fan status as show below;

-- Power Supplies --
PSU-ID  Status      Type    AirFlow   Fan  Speed(rpm)  Status
----------------------------------------------------------------
1       up          AC      REVERSE   1    22400       up

2       up          AC      REVERSE   1    22560       up

-- Fan Status --
FanTray  Status      AirFlow   Fan  Speed(rpm)  Status
----------------------------------------------------------------
1        up          REVERSE   1    15984       fail
                               2    15123       fail

2        up          REVERSE   1    15984       fail
                               2    15008       fail

3        up          REVERSE   1    16049       fail
                               2    15360       fail

4        up          REVERSE   1    16049       fail
                               2    14894       fail

The I/O is facing the hot aisle while the PSU is facing the cold aisle in the datacenter. I understand the airflow on this switch should be from rear (PSU) to front (I/O). The fan indicator shows reverse airflow.  The switch is running: 

Dell EMC Networking OS10 Enterprise
Copyright (c) 1999-2021 by Dell Inc. All Rights Reserved.
OS Version: 10.5.3.0
Build Version: 10.5.3.0.44
Build Time: 2021-10-06T23:03:55+0000
System Type: S4148T-ON
Architecture: x86_64