Two 80mm ultra-quiet fans and an electronic speed controller reduce the fan speed to nearly silent (<21 dB) as needed to keep the L2-ENC enclosure at optimum operating temperature. The lockable door uses free ventilation (fans off) when the modules are under low load. The fan controller magnetically attaches to the door face and is powered by an Accessory Power Regulator (L2-APR). Temperature and Humidity sensor data is available over the PDM data bus and may be monitored and used in control rules to further protect the lifespan of the modules in the enclosure. The L2-ENCFAN2 is required to meet the UL Certification
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