Well, if you have a noisy NAS and want to drown it out, get the CRS310. The CRS310 fan will do that for you. It’s certainly not a product you wany inside a house or facility. I had to move it to the garage!
What SFP modules are you using?
My CRS310 fan turns off after boot.
Please do not start multiply topic on the same subject
http://forum.mikrotik.com/t/crs310-fan/166197/1