Brian from Backblaze here.  Aren&#x27;t most standard closed racks 36&quot; deep?  From this wikipedia article: <a href="https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;19-inch_rack" rel="nofollow">https:&#x2F;&#x2F;en.wikipedia.org&#x2F;wiki&#x2F;19-inch_rack</a>
&quot;...  A standard 19-inch server rack cabinet is typically 42u in height, 19-inch wide, and 36 inches deep ...&quot;