SYS-7048A-T has default cooling fan 2 x FAN-0104L4 (middle cooling fan, 80x25 mm, 2.8K RPM, 24 dBA) and 1 x FAN-0103L4 (rear exhaust fan, 92x25 mm, 2.4K RPM, 25 dBA).
If the customer wants to enhance the cooling capacity, below are the options. Please note that the overall system acoustic noise will increase apparently after upgrading to following cooling fans.
FAN-0074L4 (Middle Cooling Fan, 80x38 mm, 5K RPM, 45 dBA)
FAN-0082L4 (Rear Exhaust Fan, 80x38 mm, 5K RPM, 45 dBA)