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Noctua NF A4x20 FLX 40mm 40X40X20mm 5000 RPM 14.9 dB(A) PC Cooling Fan Cooler Fan Radiator fan Computer Cases & Towers Fan|cooler fan|cooling fanradiator fan - AliExpress
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New cooling fan 109P0424H6D18 40mm 4cm 24V 0.07A 3wire 10 pcs/lot|cooling fan|24v cooling fanfan 24v - AliExpress
![I wanted to upgrade my stock part cooling fan to a pair of noctua 40mm fans and when I did a test run they barely push any air through the ducts compared I wanted to upgrade my stock part cooling fan to a pair of noctua 40mm fans and when I did a test run they barely push any air through the ducts compared](https://preview.redd.it/iowcxp3hjsh51.jpg?auto=webp&s=3ada0ae8b6e0b5df99650b5a7fecdb2c8ed3e30e)