Racks clearance

Anyone knows the requirements for the racks clearance in the server room?  Or recommended clearance off the walls.

I read front should be 36" and rear 24"  Now, what about the sides of the racks?  Contractor is about to install one of my racks with its side flashed to the wall.  I believe it would be uncomfortable to mount equipment with one side right next to the wall.  Screw rails in, cable mgmt, power, etc.
What are the requirements or suggestions.  Thanks in advance.
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Tiras25Asked:
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andyalderCommented:
If you look at the racks in a datacentre or co-lo they are all bolted together in a row, a private datacentre may have nothing between the individual rack units but a co-lo has a sheet of steel in between each rack. Any mounting of hardware, cabling etc has to be done from back or front, there's no side access whatsoever. It's certainly easier to take the side panel off a rack sometimes but it shouldn't be necessary so butted up against the wall is OK.
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Tiras25Author Commented:
Not rear to the wall but one of the side flashed to the wall. Bolted to the wall.
is it OK?
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andyalderCommented:
Yes it is OK although I wouldn't expect it to be bolted to the wall, just flush with it. Full size racks are never rear to the wall, you couldn't wire the kit up.

36 inches is a bit short for the front access though (unless you can slide the rack backwards on castors) as some servers are almost that long and you have to mount them via the front.  24 inches is overkill for the rear assuming your rack has split rear doors
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Tiras25Author Commented:
Just open-frame racks.  No doors and no side-walls.

So you think its OK to have a side flashed to the wall.   I was thinking is a bit uncomfortable.  For example to screw rails, drill has some thickness, or even using a manual screwdriver would be uncomfortable next to the wall. no?
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andyalderCommented:
May be a bit uncomfortable but how often do you take a server out of a rack or put one in?

BTW, I think you mean flush, not flash.
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Tiras25Author Commented:
Got it.  Thanks Andy.
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