System 3E is small thermally-activated ventilation system for smaller installations. It is Ideal for bedroom audio system tucked into nightstand or the CPU in kitchen cabinet. The system 3 is also ideal for use within larger enclosure where pockets of heated air must be dispersed. Two 80mm fans connect to small control unit which also contains plug-in connections for the power supply and thermal probe. The fans are mounted in the enclosure per suggestions in the installation instructions. The thermal probe is attached to the hottest component in the equipment enclosure and the power supply simply plugs into any convenient AC socket.