Travis, My understanding of this exception as you are explaining it is that it only applies when you are able to throw water both over and under the obstruction.
When this first was introduced, I think in the 2002 ed., everybody cheered and thought that we could ignore nonstructural obstructions, but it was pretty quickly addressed in webinars by AFSA and the *FSA that this wasn’t the case. At the time, I remember it being qualified that the intent wasn’t to “hide” sprinklers but to make it more flexible when the intent of over and under was meet. You might be able to make the case with ceiling fan housing, but I know of several jurisdictions that won’t allow it. You either meet the 3x rule or you add an additional sprinkler. Just a little bit more fodder for the fire. Thank you, Bob Knight, CET III 208-318-3057 From: Sprinklerforum [mailto:[email protected]] On Behalf Of Travis Mack Sent: Monday, January 23, 2017 2:25 PM To: [email protected] Subject: Re: QR STANDARD SPRAY SPRINKLERS For a twist: Yes, you would follow 3x rule. However, it is likely light hazard with ceiling fan. So, since it is non-structural, do you have to follow it? I think prudent design is to be the 3x away with QR sprinklers. However, it could be ignored since it is non-structural. I typically see residential or ex cov sprinklers in these situations and that forces you to the 4x rule. Plus the allowance for non-structural is only for standard spray sprinklers. Travis Mack, SET MFP Design, LLC "Follow" us on Facebook: <https://www.facebook.com/pages/MFP-Design-LLC/92218417692> https://www.facebook.com/pages/MFP-Design-LLC/92218417692 Send large files to MFP Design via: https://www.hightail.com/u/MFPDesign Sent from my iPhone On Jan 23, 2017, at 2:10 PM, Mark Phillips <[email protected]> wrote: NFPA 13 2013 ED 8.6.5.2.1.3 (A) From: Sprinklerforum [mailto:[email protected]] On Behalf Of Trillium Fire Sprinkler Design Inc. Sent: Monday, January 23, 2017 4:06 PM To: [email protected] Subject: RE: QR STANDARD SPRAY SPRINKLERS CAN YOU REFERENCE A CODE FOR ME? From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mark Phillips Sent: January-23-17 4:05 PM To: [email protected] Subject: RE: QR STANDARD SPRAY SPRINKLERS Three times rule applies to the fan housing unit (motor) From: Sprinklerforum [mailto:[email protected]] On Behalf Of Trillium Fire Sprinkler Design Inc. Sent: Monday, January 23, 2017 3:56 PM To: [email protected] Subject: QR STANDARD SPRAY SPRINKLERS I KNOW FOR 13R YOU NEED TO BE A MINIMUM OF 3'-0" AWAY FROM THE CENTER OF A CEILING FAN WITH RESIDENTIAL HEADS I CANNOT FIND WHERE THE SAME APPLIES FOR A 13 SYSTEM USING STANDARD Q.R. PENDENT OR CONCEALED HEADS. CAN SOMEONE VERIFY OR EDUCATED ME ON THIS PLEASE? THANKS _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
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