Underside of <a href="//commons.wikimedia.org/wiki/Cable_tray" class="mw-redirect" title="Cable tray">cable tray</a> penetration after fire and hose stream testing leading to <a href="https://en.wikipedia.org/wiki/en:Certification_listing#Firestop_Configuration_G" class="extiw" title="w:en:Certification listing">UL Firestop Certification Listing C-AJ-8073</a>.
<a href="//commons.wikimedia.org/wiki/User:Achim_Hering" title="User:Achim Hering">Achim Hering</a>
2007-06-26
<span class="int-own-work" lang="en">Own work</span>