Update data-box-overview.md

added cooling information

Author: LakshJ-MS

articles/databox/data-box-overview.md

@@ -110,6 +110,7 @@ The Data Box device has the following features in this release.
 | Security                                                | Rugged device casing with tamper-proof custom screws <br> Intrusion detection system in device <br> Secure boot <br>Hardware Root of Trust <br> TPM 2.0  |
 | Data transfer rate                                      | Approx. 7 GB/s using SMB Direct on RDMA (100-GbE) for large files. Both data ports can be used, though not required. Performance might differ depending on the source and size of your files.      |
 | Management                                              | Local web UI - one-time initial setup and configuration <br> Azure portal - day-to-day device management |
+| Cooling capability                                      | Fan cooled internally. <br> Operating temp is (0-35)C normal with full performance and (35-45)C with reduced performance <br> Storage temp is (-40 to 60)C <br> Airflow details are 144 CFM/KW for 120 TB and 122 CFM/KW for 525 TB |
 
 [!INCLUDE [data-box-cable-adapter](../../includes/data-box-cable-adapter.md)]