The only reason you didn't ID the answer is that you are limiting
yourself to thinking just about only soffits on the wall. What about
when you run a beam down the middle of a room with side walls on both
sides?
Roland
On Aug 13, 2007, at 10:55 PM, A.P.Silva wrote:
NFPA 13, 2002; 8.7.4.1.3.1 states deflector to bottom of soffit to be
MINIMUM 2 inches. The commentary in the handbook says depth of
soffit is
limited to 8 inches, to project water to the back wall. So wouldn't
the
deflector to bottom of soffit also affect spraying to the back
wall, and
thus be limited to MAXIMUM 2 inches? There is no comment in the
handbook for
the restriction of the deflector height above the bottom of the
soffit.
If not, is there a maximum?
Tyco Series LFII, residential sprinkler design guide, figure 4,
part 2,
limits MAXIMUM distance to 4 inch. (Tried checking design guides in
the web
for Reliable, Viking and Victaulic for comparison but for some
reason been
unable to download them, maybe my server is currently too slow)
The problem is residential heads (TYCO LFII) have been installed in
an 8
inch wide soffit (in a residential corridor), with the deflector 7
1/2"
above the bottom of the soffit. It clearly violates the TYCO design
guidelines. I'm looking at recommending replacing with standard q/r
heads
(provided the hydraulics work, of course). Is that an option?
Going by the available info, it should be okay, as NFPA does not
give a
maximum value. However, I am worried whether it is an error in NFPA.
Anyone out there has given this some thought?
Tony
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