& everflow 4CM 4010 ultra slim fan Max airflow ratewithin the aperture 3. 2MM is DOUBLE-SIDED counterbore (outside the aperture 4.2MM) counterbore depth 2. 5MM to avoid HEAD above the Fan 2-wire 2510-P general 2Pbasic parameters: everflowmodel: R124010BU(2)size: 40 mmX40mmX 10. 80MM HOLE heart distance 51MMbearings: Double Ballrotational speed: 5300 rpm ± 5% air volume not mutevoltage: 12V DCcurrent: 0.18A measured about 0.15Awiring: 2-wire 2510-Putong 2p