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The APC Matrix-UPS 3000 Isolation Unit IU bottom fan APC part number appears to be 490-0006-A. There are three OEM parts that APC appears to have used: NMB Technologies 4715KL-05W-B30-P00 Japan Servo CNDC24B7-34 Sunon KDE2412PMB1-6A But any fan that has the following specs should work: 119mm x 119mm x 38mm, plastic (black) 94V-0, ball bearing, 2-wire, 24 VDC (9.0V min, 10V to 27.6V), 2800 RPM, 80 CFM min, 41 dbA max