I swapped my two NZXT AER exhaust fans in my H500i with a Noctua NF-A12x15 120mm PWM (back) and a Noctua 140mm NF-A14 PWM (top). CPU is a few degrees cooler, but
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Noctua NF-A14 industrialPPC-3000 PWM PC fan Black, White (W x H x D) 140 x 140 x 25 mm | Conrad.com
NOCTUA NF-A14 industrialPPC-3000 iPPC-3000 PWM 140mm 3000 RPM Heavy Duty PC Cooling Case / Radiator Fan – SweetLoot – Computer and Tech Lifestyle Store