Spal Brushless fans have the following advantages:

PWM and analog input for continuous adjustment of fan speed, but also possible to run at full speed off 24 V.
Long service life – up to 40 000 hrs
On-board diagnostics
Fully sealed motor with built-in internal electronics
IP68 and IP6K9K protection
High resistance to vibration and mechanical stress
High efficiency and low power consumption
Light weight
Low profile
Low noise and vibration
Spark free
Very long life under all conditions
Higher ambient working temperature