Obviously the Sun Fire T1000 is a noisy machine, that's why it's sitting in the closet in the first place. But it has more shortcomings that make it a closet-unfriendly server:

• It shuts down at 50 degrees Celsius. That means wrapping it in a duvet to damp the noise is not a great idea if you want it to do any work.
• The power button sticks out. That makes it way to easy to press it if you're getting something else from the closet.