UQFP-2 Number of Fans: 2 Features: -Thermostatic, proportional fan control -100 CFM cooling capacity (4 Fan model), 50 CFM cooling capacity (2 Fan model) -Digital processor varies fan speed based on enclosure temperature for ultra quiet operation -On-board digital processor monitors rack temperature via external sensor -Local and remote notification of over temperature and fan fault to control system UQFP Series Specifications # of fans LED? Free Air Rating Max Sound Level Racking Height 2 fans no 50 CFM 24 dB 3 1/2" (2U space) 4 fans no 100 CFM 27 dB 3 1/2" (2U space)