That's because you don't see continuous unlimited return grills, you
know that Ron. That's like comparing a paper cut to a missing finger
and telling me I don't need a band-aid.
Return Plenum is irrelevant (we as far as sprinklers are concerned).
As already pointed out, it's no longer a concealed space.
On a related theme, we believe that a small opening (say no more than
12 inches wide) around the perimeter does not present the same problem
since the centerline of the fire is away from the wall so a
significant amount of the heat will be caught by the ceiling. That
naturally must be discussed with the AHJ beforehand.
Roland
On Aug 5, 2008, at 6:59 AM, Fletcher, Ron wrote:
You can have an unlimited number 2'x4' return air grills in the
ceiling
without adding sprinklers above but put a 4" wide slot around edge of
the room and sprinklers are required. Go figure.
Where do you get "a plenum thus requiring sprinklers"?
Ron Fletcher
Aero Automatic Sprinkler
Phoenix, AZ
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