PROGRAMED RAMP UP: Set your temperature threshold on startup and rate of increase from compact a PCB. ^^
QUIET WHILE LOW USAGE: Keep your cooling as unnoticeable as possible with a lower threshold of 17 decibels.
^^ POWERFUL WHILE HOT: Compact 4" fans will ramp up to over 200 CFM when thermostat sensor detects significant heat.
^^ LONG LIFESPAN: 67, 000 MTBF on each ball bearing fan.