Your asking a question which will not give you results that you cannot act upon.
The layout and airflow of each clients cabinet will affect the temperature their servers run at.
If you leave space between servers, have holes on top of of the rack without blanking panels, etc... your servers will run hotter as you are letting the hot exhaust get recirculated into the cold intake of the servers.
That is the clients responsibility to get manage inside their rack.
You need to ask the datacenter to provide you with the ambient air temperature in the cold row where your rack is located. That is what they are responsible for providing at an adequate temperature.
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