Careful with only running 1 fan. I had an AM Prisma that only had 1 fan. The miner was using ~1100 watts and the single fan failed. In a short order, the miner caught fire and was destroyed in a nice flaming bunch of expensive electronics.
Watch air closly as you dont want to get to hot. Warranty has changed a lot on what you can do at this point.
Open up a RMA with a ticket and hopefully they send you one for free. If nothing else it documents you had permission to mess with fan.
Did you not read at all
Turns out the second fan was working the whole time, it was just the fan grill that made it look like it wasn't working (derp). So my previous noise level estimates were taken from the unit with both fans working.
Also, I just took a power reading and it looks like this miner takes 1200W exactly for me, using a LEPA 1600W PSU.