The thermodynamic transfer of excessive heat generated by transformer, signal conversion and vacuum tube components in the confines of a steel enclosure has traditionally been managed through caloric / entropic thermal conductivity. Sometime after the invention of the wheel, man invented venting slots. <br /><br />

Translation: warm air comes out the holes (and it looks pretty cool, too). <br /><br />

$19 bucks in blue to match your Neve modules.<br /><br />

<div><div style="background-color: rgb(255, 255, 255);"><a href="http://rsperackrevolution.com/" target="_blank"><br class="Apple-interchange-newline" /><img src="http://www.rspeaudio.com/v/vspfiles/assets/images/rackrevolution-small.png" alt="" align="" border="0px" /></a></div><p style="background-color: rgb(255, 255, 255);">Don’t forget to check out <a href="http://rsperackrevolution.com/" target="_blank" style="color: rgb(0, 0, 153); font-weight: bold;">RSPE’s Rack Revolution</a>, a virtual 500-series rack builder that lets you custom-configure the perfect 500-series lunchbox for your studio, DAW, or mobile recording rig. RSPE carries every 500-series module imaginable, including mic preamps, compressor-limiters, equalizers, and 500 power racks.</p></div>