PROCOOL model SP640TV utilizes (6) 40mm high speed industrial strength dual ball bearing fans that deliver high airflow to cool down the hottest
racks. The fan controller will monitor the rack or cabinet temperature and start and stop the fans when the user preset temps are reached. When the ON temp is reached the fans will start. Once the rack has cooled to the OFF temp setting the fans will shut off. 
The easy to read Blue LED display shows the temperature in F or C for convenient monitoring. The display can be turned off if desired without affecting operation of the system. Additionally the fan controller can be set to Always On Mode which bypasses the temperature control. 
Additional fans can be connected and controlled by the fan controller. Up to 2 more fan panels or 6 individual cabinet fans can be added. The number of additional fans is limited to the cumulative power consumption of 2 amps for the standard system. Custom systems are available with up to 6 amp capability.