Todd,

There are no lights or fans or ducts that would create an issue.  The
deflector is 6" below the deck so I only have 9" to worry about.  I'm trying
to not say exactly what this guy has said so that I can get other opinions
before I influence anyone's answer.  

If anyone else wants to throw in their two cents, that would be great.

Thanks,
Cliff

-----Original Message-----
From: sprinklerforum-boun...@firesprinkler.org
[mailto:sprinklerforum-boun...@firesprinkler.org] On Behalf Of Todd Williams
Sent: Monday, February 08, 2010 3:59 PM
To: sprinklerforum@firesprinkler.org
Subject: Re: Beam obstruction rules

How far down is the deflector from the deck? Any lights/ceiling fans 
that could be in the way?


At 04:39 PM 2/8/2010, you wrote:
>Forum,
>
>I have a question regarding beam obstruction rules for standard spray
>uprights.
>
>I have a light hazard project that has 15" deep beams.  The first beam is
9'
>from the wall and the next beam is 17' away from beam #1.  If I space my
>first head 5' away from beam #1 so that it is not an obstruction (per table
>8.6.5.1.2-NFPA 13, 2007 ed), can my next head be 15' from head #1?  This is
>not supposed to be a trick question but I have a disagreement with an FPE
on
>this.
>
>Thanks for your insight on this one.
>
>Cliff Whitfield, SET
>President
>Fire Design, Inc.
>
>cl...@fire-design.com
>www.fire-design.com
>

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