Thanks everyone, It is actually considered an open grid ceiling (Thanks for directing me to Sec.8.15.3).
George Medina Jr. -----Original Message----- From: George Church <[email protected]> To: [email protected] Sent: Wed, Apr 14, 2010 6:14 am Subject: RE: Grating Boxes are placed on grated floors, creating obstructions to spray that ren't apparent at final inspection. -----Original Message----- rom: [email protected] mailto:[email protected]] On Behalf Of [email protected] ent: Wednesday, April 14, 2010 8:29 AM o: [email protected] ubject: RE: Grating Grating is grating. It deflects and is an obstruction to the sprinkler pray pattern. Heads need to be below. Open grid ceilings are a different animal as they typically occur moreso in ight or possibly ordinary hazard occupancies. Ceilings are one thing and floor grating is another. Don't confuse the two. If you have 2007, look at 8.5.5.3.3 and A.8.5.5.3. 8.5.5.3.3* Sprinklers installed under open gratings shall be of the ntermediate level/rack torage type or otherwise shielded from the discharge of overhead prinklers. Commentary: FAQ:Where open grating is utilized, are additional sprinklers required elow the open grating? Sprinklers installed under open gratings are addressed in 8.5.5.3.3. lthough open grating llows heat from a fire to pass through it and reach a sprinkler, the penings are not adequate o compensate for obstructions to the sprinkler spray pattern. Thus, upplemental sprinklers nder the open grating deck are necessary. Gratings or slatted decks and alkways are requently covered with goods in storage or by a light surface dust stop. prinklers are equired under such gratings and walkways. Sprinklers located below the open rating must e provided with a water shield or be of the intermediate level/rack storage ype to prevent ater from sprinklers that are operating above from wetting the thermal lement and delaying prinkler operation. raig L. Prahl, CET ire Protection Specialist echanical Department H2MHILL ockwood Greene 500 International Drive O Box 491, Spartanburg, SC 29304-0491 irect - 864.599.4102 ax - 864.599.8439 [email protected] ttp://www.ch2m.com ----Original Message----- rom: [email protected] mailto:[email protected]] On Behalf Of George Medina r ent: Tuesday, April 13, 2010 7:06 PM o: [email protected] ubject: Grating What is the dimensions of grating when sprinklers are required underneath? I ooked under NFPA-13 (2007 ed.) index for Grating and found no pecifications. George Medina Jr. = ______________________________________________ prinklerforum mailing list [email protected] ttp://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] Put the word unsubscribe in the subject field) ______________________________________________ prinklerforum mailing list [email protected] ttp://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] Put the word unsubscribe in the subject field) _______________________________________________ prinklerforum mailing list [email protected] ttp://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
