RF shield cage for hardware? (1 reply)

I can see why people use a closet to locate the home network modems, routers, switches, power supplies and all that. I'd like to find some smallish metal box to do the same hardware on a desktop, and that wouldn't seem difficult to put together. But those high frequencies have short wavelengths and if my shielding knowledge is decent I'm not sure you could engineer it to be full shielded whilst somehow keeping it cool.

This tangent is inspired by a Netgear router and switch here; both produce a very high freq pitch when turned on.