I’m a big fan of the Synology range of NAS devices. I have owned quite a few and recently had an issue with one of mine.
A fairly recent purchase was one of the DS923+ models however after about 6 months I have found the fans to start becoming noisy. Even though I run them with low power WD RED SSD’s so there is little or no heat AND have them using ‘quiet mode’ it was still noticable.
I can only guess that Synology have started using cheap components as this has never been an issue for me.
A quick search uncovered this thread https://nascompares.com/guide/synology-ds923-nas-noctua-fans-and-velcro-tutorial/ which seemed to recomend the Noctuna NF-A9 FLX fans. I puchased some, fitted and quickly realised they are totally unsuitable, so dont beleive all you read 
Basically the power ratings are incorrect for what the Synology fan controller expects. The Synology ones are 0.12A, whereas the NF-A9 ones are 0.07A. If they are connected to the Synology, it thinks the fans have failed regardles of speed setting.
There was some discussion of using the pull-up resistors provided in the sets. This did not work for me and I didnt want to lash up my own lead with a 100ohm resistor inline. https://noctua.at/en/products/fan/nf-a9-flx
Also the NF-A9 ones have rubber mounts which do not allow them to be fitted correctly to the Synology. It makes the mounting bend due to them slightly being oversized. I ended up sending them back.
However, a bit more research and I found the perfect fit. The Nocuta NF-B9 redux 1600’s (see https://www.amazon.co.uk/dp/B0014I9K30) are a perfect like for like fit.
They are rated at 0.11A and fit perfectly. The cables are slightly long however a small cable tie sorted that. See https://noctua.at/en/nf-b9-redux-1600
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