Pro Cool 80x80x25mm 3 Pin 12 Volt Thermistor Fan-SXT80

840556001393

These extremely quiet variable speed fans provide up to 32 CFM each with only 14 dBA of noise.

Each fan has it's own thermistor probe (24" length) that you position near the heat source for precision cooling. Or can be located at the top of the cabinet for overall temperature sensing.
You should consider the heat source when deciding where to locate the probes.
It is best to locate the controller probe near the hottest source.

A thermistor probe controls the speed from low to high speed. When the probe is cool the fan runs slow. At about 80°F the speed begins to increase. Full speed is reached at about 95°F.