Dell Networking Switch Sound Question - N1524P / N1548P

I have a few requirements which the Dell N1524P seems to meet. I'm looking for a 48-port 1gb copper switch with 4x 10gb sfp+ uplinks for server connectivity. POE is also a requirement along with the form factor being under 15" deep because of a wall mounted rack limitations. The N1524P meets all these requirements that fits the budget, that fits the Cisco like CLI with OS6 and I'm fine with Dell networking. My last question which is NOT documented anywhere on this switch is the noise levels? I need a nearly silent switch. My hope is that some one out there has this model N1524 or N1548P that can comment on the noise levels?