2 x Corsair AF140 Air Series, 140 mm LED Low Noise Cooling Fan - Blue (Dual Pack) - £15.98 @Amazon

Item dimensions L x W x H 14 x 14 x 2.5 centimetres

Power connector type 3-Pin

Voltage 12 Volts

Cooling method Air

Compatible devices Desktop

Noise level 26 dB

Material Plastic

Maximum rotational speed 1400 RPM

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Up to 62 CFM of airflow at peak 1,150 RPM.
Four hub-mounted bright LEDs light up your system.
Low-noise operation, with a custom fan blade design and hydraulic bearing.
The ideal combination of high airflow and static pressure, allowing for use as a case fan, or with CORSAIR Hydro Series Liquid CPU coolers.
An opaque fan blade diffuses lighting to ensure stunning illumination anywhere in your system.