EX4 in standby mode temper. 40°С/104°F and fan 1065rpm

My EX4 in standby mode have temperature is 40°С/104°F and speed fan always 1065rpm with spin down HDD disks and disconnected all LAN links. Is it normal???

Is fan in EX4 never turning off or it’s only My problem?

Firmware version is last (2.11.140)

You are one of the lucky ones, usually fan is off.

If it only problem of my EX4, how I can resolve this?