Interesting! A 2' perimeter open to above is kind of like the opposite of a floor opening, where we put water curtains. With no sprinklers above, the fire should not SPREAD from the wall toward the middle more than a few feet. A draft stop all the way around with heads on the inside at 6' seems a little much, but has precedent. If you sprinkler around the opening up above, what is your deflector distance? If it is 12", as the ceiling steps down, the head above gets farther from the heat. You know the heat is going to be a few inches above the opening- so using the same logic as with rack sprinklers, wouldn't that be the best deflector (bulb) location? Now there are two weird things to get approved...
-----Original Message----- From: Jimmy Waite [mailto:[email protected]] Sent: Tuesday, December 14, 2010 7:52 AM To: [email protected] Subject: Ceiling "Clouds I know this has been talked about before, but I am having trouble getting onto the archives. I have a situation in an auditorium/lecture hall that has a ceiling that steps down as you get closer to the front of the room. However, there is about a 2'-0 perimeter around the room that is open to the non-combustible space above the ceiling. In this case I'd be willing to sprinkle around the opening (sort of like 8.15.1.5 in the '07), but it seems pointless to provide coverage over this entire lowered ceiling. Is there any code that backs this up? I thought I've heard some, but I don't know where it is. Thanks, Jimmy Waite Design Engineer [email protected] mobile: 919.622.7030 _______________________________________________ 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) _______________________________________________ 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)
