Anthony-
The wording in 8.6.4.1.1.3(b) points you to the “obstruction rules…”. I agree 
the choice of words can be confusing though because it almost makes it sound 
like all you have to do is follow figure 8.6.4.1.1.3(b)

Thank you,

Brian Harris, CET
BVS Systems Inc.

From: Anthony Johnson <mountainfirepr...@gmail.com>
Sent: Monday, June 2, 2025 2:34 PM
To: Discussion list on issues relating to automatic fire sprinklers 
<sprinklerforum@lists.firesprinkler.org>
Subject: [Sprinklerforum] Re: Ceiling Obstructions

Can you explain your reasoning for this conclusion? Why is this code there if 
you still have to use the obstruction rules? I'm interested in knowing if I've 
been interpreting this wrong.

Anthony

On Wed, May 28, 2025 at 9:35 AM Ed Kramer 
<e...@bamfordfire.com<mailto:e...@bamfordfire.com>> wrote:
Brain cramp or not, you are correct.

Ed K

From: Brian Harris <bhar...@bvssystemsinc.com<mailto:bhar...@bvssystemsinc.com>>
Sent: Wednesday, May 28, 2025 7:54 AM
To: 
sprinklerforum@lists.firesprinkler.org<mailto:sprinklerforum@lists.firesprinkler.org>
Subject: [Sprinklerforum] Ceiling Obstructions

Having a brain cramp this morning..
(NFPA13 / 2013) There’s got to be more to Fig 8.6.4.1.1.3(b) with regard to 
ceiling height changes. For example, what if the head (blue arrow) is only a 
foot off the ceiling height change? I assume 8.6.5.1.2 would have to come into 
play as well?

[cid:image001.jpg@01DBD3CE.34046AB0]

Thank you,

Brian Harris, CET
BVS Systems Inc.
bvssystemsinc.com<http://bvssystemsinc.com/>
Phone: 704.896.9989
Fax: 704.896.1935


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