Cheapen it down by mis-assessing the concept. The volume of a cell is quite
a bit different than that of a floor or wing.

On Tue, Sep 20, 2016 at 8:16 AM, rongreenman . <rongreen...@gmail.com>
wrote:

> That's a major concern. I think the specifier saw a typical use and
> decided he could cheapen it down.
>
> On Tue, Sep 20, 2016 at 8:14 AM, michael G <m...@keyfps.com> wrote:
>
>> No, they are back at the main return, that is it. just one duct detector,
>> that covers about 30 cell pods.   They do not have any detectors in the
>> grilles in the cell pods.   that’s our main concern.
>>
>>
>>
>> *From:* Sprinklerforum [mailto:sprinklerforum-bounces
>> @lists.firesprinkler.org] *On Behalf Of *rongreenman .
>> *Sent:* Tuesday, September 20, 2016 11:07 AM
>>
>> *To:* sprinklerforum@lists.firesprinkler.org
>> *Subject:* Re: Pre-action detection
>>
>>
>>
>> I am presuming the duct detectors are just inside the return air from the
>> cells and the day rooms  and other common areas are high ceilinged with
>> normal detectors or where ceilings are low the access is limited.
>>
>>
>>
>> On Tue, Sep 20, 2016 at 7:54 AM, <craig.pr...@ch2m.com> wrote:
>>
>> Where a fire alarm system is installed, duct detectors are an initiating
>> device attached to and powered by the FACP system just as any other room
>> detector.  It’s essentially a regular detector head with tubes placed in an
>> enclosure.
>>
>>
>>
>> Here’s a quote to chew on from the book, Operation of Fire Protection
>> Systems:
>>
>> “The detection of duct smoke is made difficult by its dilution with
>> return air from other spaces (away from the fire) and possibly with outside
>> fresh air.  Also, when the HVAC system fan is not running, smoke may not
>> reach the duct detector. For these reasons, air duct smoke detectors must
>> never be considered as a substitute for open area protection.”
>>
>>
>>
>>
>>
>>
>>
>>
>>
>>
>> *Craig L. Prahl*
>> Fire Protection Group Lead/SME
>> *CH2M*
>> 200 Verdae Blvd.
>> Greenville, SC  29607
>> Direct - 864.920.7540
>>
>> Fax - 864.920.7129
>>
>> CH2MHILL Extension  77540
>> craig.pr...@ch2m.com
>>
>>
>>
>> *From:* Sprinklerforum [mailto:sprinklerforum-bounces
>> @lists.firesprinkler.org] *On Behalf Of *Parsley Consulting
>> *Sent:* Tuesday, September 20, 2016 10:22 AM
>> *To:* sprinklerforum@lists.firesprinkler.org
>> *Subject:* Re: Pre-action detection [EXTERNAL]
>>
>>
>>
>> Greg,
>>     The first issue that came to my mind was that the duct detector is
>> frequently provided with power from the HVAC system and not from the FACU
>> or releasing panel.  I don't know the logistics of what you're dealing with
>> or whether that issue might have some impact however that might be worth
>> looking into.  I have to admit I'd never heard of something like this.
>> That by itself doesn't mean it's outside the listing or the guidance in -72
>> or -13, just that I've never run across this configuration.
>>
>>
>>
>>
>>
>>
>> *Ken Wagoner, SETParsley Consulting350 West 9th Avenue, Suite
>> 206Escondido, California 92025Phone 760-745-6181 <760-745-6181>Visit our
>> website <http://www.parsleyconsulting.com/> *
>>
>> On 09/20/2016 6:28 AM, Gregg Key wrote:
>>
>> Greetings,
>>
>>
>>
>>                               First of all, what a great convention. Good
>> speakers and fellowship. Nashville was awesome as well. I am in serious
>> need of some technical assistance. I have posted this a few times with some
>> response but this has become a three ring circus between the architect
>> ,fire marshal and us . The Architect specified a double interlock
>> pre-action system with the detection being provided with a duct detector in
>> the return duct at the unit. We have refused to certify the system due the
>> fact that the detector not being listed for this application. State is
>> asking me to hang a partial certification ( yellow tag) . has anyone else
>> dealt with this detection being used for a pre-action system in a detention
>> center?   Any help would be appreciated
>>
>>
>>
>> Gregg Key
>>
>> General Manager
>>
>> Key Fire Protection Enterprises,LLC
>>
>> 3200 Mike Padgett Hwy
>>
>> Augusta GA, 30906
>>
>> O-706-790-3473
>>
>> C- 706-220-8821
>>
>> F- 706-738-2119
>>
>> gr...@keyfps.com
>>
>>
>>
>>
>>
>>
>>
>> _______________________________________________
>>
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>>
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>>
>>
>>
>>
>> _______________________________________________
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>>
>>
>>
>>
>> --
>>
>> Ron Greenman
>>
>>
>> 4110 Olson Dr., NW
>> Gig Harbor, WA 98335
>>
>> rongreen...@gmail.com
>>
>> 253.576.9700
>>
>>
>>
>> The Universe is monstrously indifferent to the presence of man. -Werner
>> Herzog, screenwriter, film director, author, actor and opera
>> director (1942-)
>>
>>
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>
>
> --
> Ron Greenman
>
> 4110 Olson Dr., NW
> Gig Harbor, WA 98335
>
> rongreen...@gmail.com
>
> 253.576.9700
>
> The Universe is monstrously indifferent to the presence of man. -Werner
> Herzog, screenwriter, film director, author, actor and opera
> director (1942-)
>



-- 
Ron Greenman

4110 Olson Dr., NW
Gig Harbor, WA 98335

rongreen...@gmail.com

253.576.9700

The Universe is monstrously indifferent to the presence of man. -Werner
Herzog, screenwriter, film director, author, actor and opera
director (1942-)
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