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USG Pro 4 fan noise. Upgraded to Noctua NF-A4x20 and now there is day and night difference! : r/Ubiquiti
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Amazon.com: 2X Quiet Version Fans Compatible for Ubiquiti USG-PRO-4 Unifi Security Gateway Pro. (18dBA Noise) : Electronics
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eXtra-Cooling RQDH47V 2X Quiet Version Fans for Ubiquiti Unifi Security Gateway Pro (USG-PRO-4) only 13~18dBA Noise Each Fan, Best for Home
![Amazon.com: 2X Quiet Version Fans Compatible for Ubiquiti USG-PRO-4 Unifi Security Gateway Pro. (18dBA Noise) : Electronics Amazon.com: 2X Quiet Version Fans Compatible for Ubiquiti USG-PRO-4 Unifi Security Gateway Pro. (18dBA Noise) : Electronics](https://m.media-amazon.com/images/I/51i8aj+heSL._AC_SY1000_.jpg)
Amazon.com: 2X Quiet Version Fans Compatible for Ubiquiti USG-PRO-4 Unifi Security Gateway Pro. (18dBA Noise) : Electronics
![Amazon.com: 2X Quiet Version Fans Compatible for Ubiquiti USG-PRO-4 Unifi Security Gateway Pro. (18dBA Noise) : Electronics Amazon.com: 2X Quiet Version Fans Compatible for Ubiquiti USG-PRO-4 Unifi Security Gateway Pro. (18dBA Noise) : Electronics](https://m.media-amazon.com/images/I/51DtnpZhllL._AC_SY1000_.jpg)