The MSUi series with Plenum Access provides access above the ceiling, through the fixture and supplemental lighting for the operating room. This fixture is commonly located above the table perimeter using Symmetric or Asymmetric distributions. It is Listed for wet locations, cleanroom ISO-3, certified dust tight and water resistant to IP65 from below for frequent rigorous cleaning practices. MSUi is Mil-Std-461G certified and designed for recessed mounting in surgical ceiling systems as well as grid and flanged installations.