http://www.watercoolinguk.co.uk/p/Xi...0mm_18659.html
Black 40mm case fan. Cool your case with this fan from Xilence. Not only the exceptional price-performance ratio, but also the great performance and low noise emissions make this fan perfect for any application.
Technical specifications:
Dimensions: 40 x 40 x 25 mm
Noise emission: 19 dBa
Connector: 3-Pin
Nominal voltage: 12 V DC
Speed: approx. 4500 U/min.
Extent of delivery:
1x Xilence Case Fan - black ( 40x40x10mm )
4500 RPM = avion