There is no good answer.

I had the same issue and ended up switching the N252EC storage head (I had
a ceiling) to just eliminate the ESFR obstruction problems altogether.



Benjamin Young

On Tue, Mar 13, 2018 at 1:58 PM, Prahl, Craig/GVL <craig.pr...@ch2m.com>
wrote:

> There are some of these ducts that have internal struts/ribs that hold the
> duct open even when air is off, others do not have the internal support and
> will go limp if HVAC is shut down.
>
> So, if there were a sprinkler below the duct and fire broke out fusing
> that sprinkler, and if the HVAC system is interlocked to shut down on
> sprinkler flow, the HVAC system shuts down, duct collapses and sprinkler is
> rendered inoperable.
>
> You will need to verify the type of duct that is being provided and HVAC
> interlocks which may require another conversation with the insurer.
>
>
> Craig L. Prahl
> Fire Protection Group Lead/SME
> Direct - 864.920.7540
> Fax - 864.920.7129
> Direct Extension  77540
> CH2M is now Jacobs.
> 200 Verdae Blvd.
> Greenville, SC  29607
> craig.pr...@ch2m.com
> http://www.jacobs.com
>
> -----Original Message-----
> From: Sprinklerforum [mailto:sprinklerforum-bounces@lists.firesprinkler.
> org] On Behalf Of Phillips, Mark
> Sent: Tuesday, March 13, 2018 1:29 PM
> To: sprinklerforum@lists.firesprinkler.org
> Subject: RE: Duct Sox / ESFR [EXTERNAL]
>
> The underwriter insisted that we treat it as  a fixed duct because that
> was the worst case scenario
>
>
>
> Mark Phillips
> Vice President of Fire Protection, Kirlin Carolinas, LLC
> t: 919-526-1584
> mphill...@jjkllc.com | https://kirlingroup.com Raleigh, NC 27617
> -----Original Message-----
> From: Sprinklerforum [mailto:sprinklerforum-bounces@lists.firesprinkler.
> org] On Behalf Of MFP Design, LLC
> Sent: Tuesday, March 13, 2018 1:19 PM
> To: sprinklerforum@lists.firesprinkler.org
> Subject: Duct Sox / ESFR
>
> Has anyone come across the duct sox and ESFR protection?  How do you
> handle these?  I intend to put a sprinkler under the duct as normally
> required.
> But, these somewhat vanish when the HVAC system is off.
>
>
>
>
>
> Travis Mack, SET
>
> MFP Design, LLC
>
> 3356 E Vallejo Ct
>
> Gilbert, AZ 85298
>
> 480-505-9271
>
> fax: 866-430-6107
>
>  <mailto:email:tm...@mfpdesign.com> email:tm...@mfpdesign.com
>
>
>
>
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