NFPA 13 (2002 edition 8.6.5.2) says you need 18" clear for the rack to not
be considered an obstruction, the ceiling could be wherever you want but the
sprinklers would have to space to the racks, for lower ceiling hights you
may want to put a head guard on the sprinkler but that should be about the
only problems you face.
Ron Dusky
----- Original Message -----
From: "Marshall Stout" <[EMAIL PROTECTED]>
To: <[email protected]>
Sent: Monday, August 25, 2008 4:49 PM
Subject: Computer room Racks with Blade Servers
I have a computer room with 3 lines of racks. Each rack line is
approximately 9 feet long and 3 feet wide. There is a 3 feet wide aisle
between each rack line (2 aisles). Each rack is approximately 6 feet in
height. Over each aisles, there is a lexan cover at 6-1/2 feet in height
above the floor and a door at either end of the aisle, making a "room" 15
feet long and 9 feet wide in the computer room. This is for rack air
conditioning. The computer room has a wet-pipe sprinkler system.
1. According to NFPA 101, the minimum headroom is 7 feet 6 inches. With
the
door access, would this "room" be required to have a 7 feet 6 inches
ceiling?
2. To prevent sprinkler obstructions, would sprinklers be required in the
"room"?
Your opinions will be helpful.
Marshall Stout, P.E.
Fire Protection Engineer
Redstone Arsenal, AL
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