A temporary clean room has been constructed around a full-scale engineering model of the Orion spacecraft for testing in the Vehicle Assembly Building.
NASA/Dmitri Gerondidakis
<a rel="nofollow" class="external free" href="http://www.nasa.gov/exploration/systems/ground/vabcleanroom.html">http://www.nasa.gov/exploration/systems/ground/vabcleanroom.html</a> (<a rel="nofollow" class="external text" href="http://www.nasa.gov/images/content/652567main_cleanroom-vab1.jpg">direct link</a>)