Unsealed through-penetrations in fire-resistance rated assembly at Cambrian College, Greater Sudbury, Ontario, Canada, August 2000. No <a href="//commons.wikimedia.org/wiki/Firestop" title="Firestop">firestop</a> = 0 fire-resistance rating for the whole barrier. Penetrations such as these can be found by lifting ceiling tiles next to rated walls, such as those with fire doors in them, or in the service rooms.
<a href="//commons.wikimedia.org/wiki/User:Achim_Hering" title="User:Achim Hering">Achim Hering</a>
2000-08
<span class="int-own-work" lang="en">Own work</span>