Blower cooler for 1 U serve application http://www.arkua.com.tw/proddetail.asp?linenumber=60 Cooler outline dimension: 51 x 51 x 29 mm Heat sink dimension: 49 x 49 x 13 mm Material: aluminum Fan dimension: 51 x 51 x 15 mm Bearing type: ball bearing Rated voltage: 12 v dc Speed: 4500 rpm +/- 10% Noise level: 35 dba +/- 10% Air delivery: 2.85 cfm +/- 10%