This is more a vertical opening into an otherwise concealed space.
It's worth noting that the TC as accepted effectively 2 rows of
sprinklers at such locations instead of the entire space. This will
most likely be refined slight at the ROC since it currently is based
on a percentage of the dimension of the longest length of the remote
area - yea too complicated when such a simple answers exists (ie 2
rows). Sometimes the sprinkler scientists try to make things to
academically pure despite the fact that we abandoned that boat
loooooong ago.
Roland
On Aug 5, 2008, at 10:17 AM, Fletcher, Ron wrote:
Okay, here is an actual case in design now, I'm not making this up.
The
room is 27'x 27' with 2 ft. wide gap between the walls and ceiling on
three sides. Two sides have sheet rock from the ceiling to the deck.
The
third side has return air grills set on edge vertically for the full
25
ft. dimension creating a 50 sqft continuous return. Do the return air
grills have any effect on the requirement for sprinklers in the
plenum?
NFPA does not allow any wiggle room (IMHO) and requires sprinklers
throughout when it is not a concealed space. AHJ's have no incentive
to
allow anything less than the minimum and potentially a big down side
if
they do, so we always add sprinklers above the ceiling.
Ron Fletcher
Aero Automatic Sprinkler
Phoenix, AZ
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