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HSW installation under Ducts

HSW installation under Ducts

HSW installation under Ducts

(OP)
Hello forum members,

I have a question regarding correct installation of HSW sprinklers. Are sidewall sprinklers only allowed to be mounted on walls or bulkheads as per 8.7.4.1.2.2 (NFPA 13,2010). I am fairly new into Sprinkler design and wanted clear my thoughts regarding installation of HSWs. During my few site visits I have noticed HSWs being installed so often under ducts.

On this particular job, a Swimming pool area measuring 40' X 55' has 4 ducts 2 feet apart from one another creating obstruction to the sprinkler discharge. The on site crew had installed sidewall heads almost back to back on a 1" drop under one of those ducts. I see their idea to cover 14' X 14' with sidewalls on both the directions rather than installing (4) 1" drops under all 4 ducts and have upright heads. But my question is, Is this an acceptable installation per NFPA 13 ?

In my understanding of 8.7.4.1 , sidewall sprinklers shall be always mounted with deflector 4-6" off from a wall. But I am confused as sidewall sprinklers are used under the overhead doors as well.
I would really appreciate your comments and guidance.

Thanks.

RE: HSW installation under Ducts

ABdesigner,
My concern with this application is the possibility of the sidewall sprinklers cold soldering. NFPA 13 2007 states 8.7.3.1.4 Sidewall sprinklers shall not be installed back-to-back without being separated by a continuous lintel or soffit. If This was my project, I would be using uprights!

Hope this helps!

RE: HSW installation under Ducts

That installation is a violation of NFPA 13 (2010 edition) Section 8.4.2. If it's in my jurisdiction it wouldn't be accepted. A duct does not equal a ceiling, based on Section 3.3.5.

RE: HSW installation under Ducts

(OP)
Stookeyfpe,

Thank you very much for your input sir. Being newbie, I was not confident enough to make such statement to a journeyman fitter who worked on this project and told me that he has been doing it this way pretty much throughout his career.
I really appreciate your response.

Thank you for your time sir.

FPdesign,

Thanks for you input as well, I was not sure if even a single sidewall was allowed to be installed in such way.

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