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What does the red slot on my fan hub mean? It's marked as Zero and the packaging for it came with the wrong user manual lol. It's a cooler master master hub :
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Cooler Master Hyper 212 LED Turbo Red Cover CPU Air Cooler '4 Heatpipes, 2x 120mm PWM Fans, Red LED' RR-212TR-16PR-R1
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NeweggBusiness - Cooler Master SickleFlow 120 - Sleeve Bearing 120mm Red LED Silent Fan for Computer Cases, CPU Coolers, and Radiators
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Cooler Master Hyper 212 LED Turbo Red Cover CPU Air Cooler '4 Heatpipes, 2x 120mm PWM Fans, Red LED | Help Tech Co. Ltd
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