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This is something that has always confused me.
NFPA 2019 Section 10.2.7.3.1 states that continuous or non-continuous obstructions more than 18" below the deflector have to meet Section 10.2.7.3. The only big requirement I see is that items over 4-ft in width need a sprinkler underneath them. Does that mean that a sprinkler 18.1" located directly above a square duct that is 3'-11" wide does not need to worried about and the perceived obstruction of the duct is fine by code? Sent in anonymously for discussion. Click Title to View | Submit Your Question | Subscribe
9 Comments
Daniel
8/9/2023 08:05:01 am
In my interpretation of the code even if the duct is exactly 4'-0" wide (assuming no insulation) and 18.1" below the sprinkler then a sprinkler is not required below.
Josh
8/9/2023 08:14:08 am
Good point on the insulation. Often unaccounted for.
Alex
8/10/2023 07:26:10 am
I have the same interpretation.
s
8/23/2023 10:36:34 am
protect under as well.
Glenn Berger
8/9/2023 08:13:47 am
Exactly at the limits. Be careful of insulation, supports, fittings, etc that may make the obstruction wider.
Pete H
8/9/2023 08:44:14 am
Yep, that's fine. Just like Dan and Glen have commented: keep an eye out for insulation putting this over 4'-0" wide, but something tells me this was a hypothetical anyway.
Dan Wilder
8/9/2023 08:46:41 am
Technically, yes...this is an acceptable arrangement per the Standard. Now, technically speaking still, so does 2 offset 24" wide ducts within a 72" wide corridor (and/or toss in an 18" cable tray) even though a large percentage of the total area is obstructed. This often becomes a talking point with the inspector as to required vs common sense installation and by common sense I mean typically very conservative and more expensive when it comes to what is or isn't allowed/enforced.
SCHULMAN
8/9/2023 09:05:22 am
as i have told people younger than me many times in my career,
Edward
8/9/2023 10:12:30 am
I would say yes. More stringent and safer methods are always good. As long it is a negotiated project and the owner/client is willing to pay for the over-design above and beyond what is required by code. The reality is that most jobs are one and lost in the bidding process against competition with very minimal margin for error or "fluff". Leave a Reply. |
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