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ELUTENG Dual 40mm USB Fan 5V with 3 Speed Control 5500 RPM 2 in 1 Mini PC Fan 40mm USB Computer Fan with Metal Grill for PC/Xbox/VR Glass/Laptop/TV Box/PS4/Raspberry Pie/Router/AV : Amazon.co.uk:
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AABCOOLING Super Silent Fan 4 - Silent and Efficient 40mm Fan with 4 Anti-vibration Pads, 12V Fan, PC Cooling, 3D Printer Fan, 4cm Fan 17.9 dB(A), 4.9 CFM, 4500 RPM : Amazon.co.uk:
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40x10mm Ball Bearing Computer Case Fan - Computer Fans & Coolers | Computer Parts | StarTech.com United Kingdom
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