How do you shield an isolation transformer?

I have a Topaz 2.5 Kva Ultra Isolation Transformer. It has to sit in my 10' x 12' listening room behind my equipment.

It's not real close to the speakers since I have them sitting over 6' into the room in a nearfield listening setup.

I was told that the transformer generates a magnetic field that should be shielded and kept away from my equipment. How do I do this, and is there a way to do whatever so that it looks halfway decent?

Thanks,
Chuck