UQFP-2 Ultra-Quiet Thermostatic-Controlled Fan.NOTE: Photo shows 4 fans; this model has 2 fansMiddle Atlantic’s two rack-space fan panel system will provide smart cooling and monitoring of your installation with nary a whisper of fan noise. Proportional speed thermostatic fan control ensures ultra-quiet operation by varying fan speed depending on enclosure temperature. This is a 2 fan version with local LED and remote overtemp notification, free air rating: 50 CFM, max sound level: 24 dB.Also available in deluxe unit providing digital temperature display and notification in the event of fan failure via a local or remote signal to an external alarm device.Also available in 4-fan models.