A schematic showing the natural ventilation used in the Eastgate building in Harare. Note that the construction materials are special too; eg heat absorbing materials. References for the design obtained from <a rel="nofollow" class="external text" href="https://books.google.be/books?id=V85J5YzxS7MC&amp;pg=PA169&amp;lpg=PA169&amp;dq=eastgate+harare+and+stack+effect&amp;source=bl&amp;ots=JRpc4s-g4l&amp;sig=R0CeCM7aGXtX9Igr6yoJHeClPqg&amp;hl=nl&amp;ei=FJGKSuPaMqLbjQftuNFc&amp;sa=X&amp;oi=book_result&amp;ct=result&amp;resnum=1">this book (room ventilation)</a>, and <a rel="nofollow" class="external text" href="http://www.rivertime.org/lindsay/ar_articles/ar_74.pdf">this site (building construction)</a>. Similar designs could possibly be used in underground complexes too.
<a href="//commons.wikimedia.org/wiki/User:KVDP" class="mw-redirect" title="User:KVDP">KVDP</a>
<span class="int-own-work" lang="en">Own work</span>