Both. WE submitted this after trying to convince an AHJ that with a heat pump (aka low temp air), there was no need for separation. It was initiated by the discharge diffuser but the duct itself will not be radiating a higher temperature so the allowance applies overall.
Apply the NFPA caveat required for committee members when writing their own opinions, not a formal interpretation of the NFPA or any of its technical committees. Roland Roland Huggins, PE - Senior VP Engineering American Fire Sprinkler Assn. Dallas, TX http://www.firesprinkler.org <http://www.firesprinkler.org/> Fire Sprinklers Saves Lives > On May 31, 2017, at 5:27 AM, Zachary Siegrist <[email protected]> > wrote: > > I have a job where the heads ( ordinary temp) are less than 1 ft 0 in from > the edge of a downward discharge diffuser throughout the space. The > contractor has supplied me letter from the HVAC company stating that the air > discharged out of the diffusers are less than 100F and therefore the heads do > not need to be switched out or relocated to meet the specified distances in > Table 8.3.2.5(a). I believe he is trying to use Item 9 under 8.3.2.5 stating > “ordinary temperature sprinklers located adjacent to a heating duct that > discharges air that is less than 100F are not required to be separated in > accordance with Table 8.3.2.5(a).” > > My question is this: a diffuser is listed under the heating duct category in > the ‘type of heat condition’ column in Table 8.3.2.5 (a). Are diffusers > viewed differently than the ductwork itself? Any thoughts as to if the > previously referenced section applies to sprinklers located adjacent to > diffusers or just sprinklers located adjacent to heating ducts? Typically > heads are just switched out to intermediate temperature sprinklers but this > is the first time someone has taken this approach. > > Zach > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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