<a href="//commons.wikimedia.org/wiki/Bus_Duct" title="Bus Duct">Bus Duct</a> Penetration in 2 hour fire-resistance rated <a href="//commons.wikimedia.org/wiki/Concrete" title="Concrete">concrete</a> floor in a Canadian highrise <a href="//commons.wikimedia.org/wiki/Building" class="mw-redirect" title="Building">building</a>. <a href="//commons.wikimedia.org/wiki/Firestop" title="Firestop">Firestop</a> is made of stuffed <a href="//commons.wikimedia.org/w/index.php?title=Mineral_wool&amp;action=edit&amp;redlink=1" class="new" title="Mineral wool (page does not exist)">rockwool</a> with topcoat of self-leveling <a href="//commons.wikimedia.org/w/index.php?title=Silicone&amp;action=edit&amp;redlink=1" class="new" title="Silicone (page does not exist)">silicone</a> caulking.
<a href="//commons.wikimedia.org/wiki/User:Achim_Hering" title="User:Achim Hering">Achim Hering</a>
2007-04-23
<span class="int-own-work" lang="en">Own work</span>