I have an old 133 Mhz IBM with a 5.1 GB Western Digital drive and 48 Megs of RAM. Would it be safe to put it in a cabinet type enclosure with basically no way for air to get in or out? The computer fits perfectly in the cabinet with no room on either side, nor in front or back, and maybe a foot above it (where a wireless router and a cable modem will likely reside). It might be possible to remove the back of the cabinet, but is it necessary?