Sophos Utm 220 rev. 5

Hey guys, I got a old Utm appliance from my work. I got it because I wanted to learn more about the firewalls we are using for our customers and that I can dive in deeper. However, the utm is definitely tooo loud to let it on 24/7. I saw some posts where users replaced the Fans with silent wings. But unfortunately I dont find silent wings. Do you guys know where i can get some silent wings for it? I added an ssd and 8 gig of ram and it runs quite smooth, now the only "complain" is the noise Level.