Delta 120mm ball bearing fan. Model # AFB1212VHE. 4 to 13.8 volt operation. 3200RPM, 130CFM, 48Dba. This comes with your choice of untailed, 7volt, or 12 volt hookup to your 4 pin power connector! 7 volts: approximately 80 cfm and a quiet 33dBa noise level. 12 volts: approximately 130 cfm and 48dBa noise level.