If you have 18" clear from deflector down to top-of-grating, I would think the grating members could be up to 4' wide.
Ed K Bamford Fire From: Sprinklerforum [mailto:[email protected]] On Behalf Of Mike Stossel Sent: Tuesday, May 07, 2019 12:45 PM To: [email protected] Subject: RE: [EXTERNAL] EC Heads and open Grid Ceilings I could be completely off base with this, but does your ceiling need to follow open grid ceilings? The thought crossing my mind is a 2"x4" hung on its edge spaced a couple feet apart or more of a ceiling grid system installed without the tiles. Would the three times rule apply instead of the open grid rules? Mike Stossel SET 36 Barren Road East Stroudsburg, PA 18302 Office: 973-670-2627 <mailto:[email protected]> [email protected] From: Sprinklerforum <[email protected] <mailto:[email protected]> > On Behalf Of Kyle.Montgomery Sent: Tuesday, May 7, 2019 1:17 PM To: [email protected] <mailto:[email protected]> Subject: RE: [EXTERNAL] EC Heads and open Grid Ceilings I think you do, unless somehow your EC heads meet that spacing criteria (which would be a horribly inefficient use of EC sprinklers). But I'm hoping someone will disagree with me and have a good answer as to why you don't. -Kyle M From: Sprinklerforum [mailto:[email protected]] On Behalf Of James Crawford Sent: Tuesday, May 7, 2019 9:34 AM To: [email protected] <mailto:[email protected]> Subject: [EXTERNAL] EC Heads and open Grid Ceilings We have an existing building that has extended coverage heads installed, the tenant improvement involves floating wood grated ceilings that are more than 70% open and will be about 18" below the sprinkler head. Light hazard occupancy. NFPA #13 (2013) section 8.15.14 Open Grid Ceilings does not make mention of EC heads. Do we need to change all the heads in this area to standard coverage heads? Thank you James Crawford Phaser Fire Protection Ltd. Phone 604-888-0318 Fax 604-888-4732 Cel 604-790-0938 Email [email protected] <mailto:[email protected]> Web www.phaserfire.ca <http://www.phaserfire.ca>
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