Hi Guys, I have a B3 as well. I am glad that it has a new firmware and we can set the fanspeed. But it is a fact, that the fan is way more than it needed. About the Artic Cooling Fan. Its not a good choice as it has only 53 CFM arflow, which is way too low for any Antminer. The original fans has 200 CFM or more, depend on the antminer model.

As the B3 ha only 2 boards and they using a low frequency, you can use a Cooler Master Jetflo 120 which has 120 CFM and relatively cheap. I used it on one of my older BTC asic.