Since this is a fun grey area I’m going to sidestep the temperature points the member brought up and change this to just a random non heat producing device shaped the way you describe.
I would fall back on Annex A.8.12.5. “….where the sprinkler needs to spray under the obstruction or get water both over and under the obstruction….” In this case I would use Table 8.12.5.1.1 or manufacturers literature to determine the water spray pattern. If the water can go over the obstruction uninterrupted, you can probably claim you are within code, although it would create quite the shadow. If I were the building owner’s rep I would ask to have the obstruction lowered to be at least 36” below the sprinkler to allow full pattern development or shift it over to follow Table 8.12.5.1.1 due to the close proximity to sprinkler elevation. Now, if the water does not have a clear trajectory over the top of the obstruction I would say the obstruction is too high and falls into the “at or near ceiling” rules and is an obstruction to the pattern development. My opinion. Thanks, Sean VG From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack via Sprinklerforum Sent: Tuesday, August 20, 2019 7:57 AM To: [email protected] Cc: Travis Mack <[email protected]>; Kyle.Montgomery <[email protected]>; Ed Kramer <[email protected]> Subject: Re: [EXTERNAL] ESFR's and unit heaters That was my first thought. No 286F ESFR sprinklers. Travis Mack, CFPS, CWBSP, RME-G, SET 480-505-9271 MFP Design, LLC www.mfpdesign,com<http://www.mfpdesign,com> Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign<https://urldefense.proofpoint.com/v2/url?u=https-3A__www.hightail.com_u_MFPDesign&d=DwMFaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=XSIweKhAHHhyB-d63TCLaTQ55VHpbhIhFOxEPFjbNpg&m=APlWrx5rkikWu_RYi2FJN5KFeDvf1RrjEp-Gr3ahpVY&s=BtBtpxlyL51ns0GAtlAm-qi9Af0cdKAgAE6idFr5LsM&e=> Sent from my iPhone On Aug 20, 2019, at 7:47 AM, Kyle.Montgomery via Sprinklerforum <[email protected]<mailto:[email protected]>> wrote: Also, how are you complying with the temperature rating when you are that close to a unit heater? Are they making any high temperature ESFRs yet? From: Sprinklerforum [mailto:[email protected]] On Behalf Of Kyle.Montgomery via Sprinklerforum Sent: Tuesday, August 20, 2019 7:40 AM To: [email protected]<mailto:[email protected]> Cc: Kyle.Montgomery <[email protected]<mailto:[email protected]>>; Ed Kramer <[email protected]<mailto:[email protected]>> Subject: RE: [EXTERNAL] ESFR's and unit heaters I’m looking at the code again, and you may be right. But I always thought that an obstruction that close to the sprinkler (could you quantify “just below the ESFR deflectors”) would have to meet the rules for “Obstruction at or Near Ceiling”, 8.12.5.1. Are we saying that 8.12.5.1 only applies if the obstruction extends above the deflector? I thought that anything in that 0”-31” below the deflector range (shown in Table 8.12.5.1.1) was considered “at or near the ceiling”. Kyle Montgomery <image001.png> Aero Automatic Sprinkler Co. 21605 N. Central Ave. Phoenix, AZ 85024 Direct: 623.580.7820 Cell: 602.763.4736 [email protected]<mailto:[email protected]> From: Sprinklerforum [mailto:[email protected]] On Behalf Of Ed Kramer via Sprinklerforum Sent: Tuesday, August 20, 2019 6:23 AM To: [email protected]<mailto:[email protected]> Cc: Ed Kramer <[email protected]<mailto:[email protected]>> Subject: [EXTERNAL] ESFR's and unit heaters I’m looking for a bit of a reality check this morning. Got an ESFR sprinkler system and unit heaters. In plan view, the heaters are 21” by 40”. Top of the heaters will be just below the ESFR deflectors, and they will be located at least 1’ horizontally from the ESFR sprinklers. It appears that NFPA 13 (2013) section 8.12.5.2 applies. Subsection (2) reads: “Additional sprinklers shall not be required where the obstruction is 2 ft or less in width and the sprinkler is located horizontally 1 ft or greater from the nearest edge of the obstruction.” Since the heater is 2’ or less in its smaller dimension (width), does it matter that the other dimension (length) is greater than 2’? I say the length is not relevant (unless its long enough to obstruct more than 1 sprinkler, then section 8.12.5.3 applies), and subsection (2) allows me to not install a sprinkler below these heaters. How do the rest of you interpret this? Thanks Ed Kramer Bamford Fire _______________________________________________ Sprinklerforum mailing list [email protected]<mailto:[email protected]> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org<https://urldefense.proofpoint.com/v2/url?u=http-3A__lists.firesprinkler.org_listinfo.cgi_sprinklerforum-2Dfiresprinkler.org&d=DwMFaQ&c=wn3mZQLIuInh2ClcJ0_DIA&r=XSIweKhAHHhyB-d63TCLaTQ55VHpbhIhFOxEPFjbNpg&m=APlWrx5rkikWu_RYi2FJN5KFeDvf1RrjEp-Gr3ahpVY&s=uE1rF6qaAGBJB0o1bLKvPchH81hE8_DBxGR15qIO_WU&e=>
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