title: Do I need to leave gaps in a standard server rack?
body: <p>We have a 42U rack which is getting a load of new 1U and 2U servers real soon.  One of the guys here reckons that you need to leave a gap between the servers (of 1U) to aid cooling.</p>
  
  <p>Question is, do you?  When looking around the datacenter, no-one else seems to be, and it also diminishes how much we can fit in.  We're using Dell 1850 and 2950 hardware.</p>