Dave, We do a lot of residential work which contain units just as you described. I design residential sprinklers to run along the slope (4-6in down from the ceiling) as long as it falls under their individual listings. I do not remember seeing any listing dependant on the installed height above finished floor. Dewayne
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Dave Phelan Sent: Monday, February 12, 2007 6:31 AM To: [email protected] Subject: Residential Head Mounting Heights Good Morning to All, I am looking for some assistance with a residential sprinkler project and plan evaluation I am doing. The project is a series of attached single family dwellings, wood framed, that are being suppressed using the 1999 edition of NFPA 13R. The project is using a combination of horizontal sidewall and pendant heads. There is one particular area of the home that has me a bit concerned from a design standpoint. The family room on the first floor is open and rises approx. 18 feet above to an open walkway / bridge outside the second floor master suite. If you could picture a two-story atrium in a residence, thats the basic situation. The designer is calling for two sidewall mounted heads along the larger room wall just below the ceiling level. What this really means is discharging water would have to fall +- 18 feet to reach the contents burning in the family room below. I would suspect the rising heat plume would consume the falling droplets and anything hitting the vertical surfaces would also convert to steam during the 18 foot descent. I believe my question really becomes a matter of the listing standard and design limitations of residential heads. Is this situation outside of the listing standard (UL1626)? How does the list feel about unusually high ceilings in 13R systems and has anyone dealt with this in their past experiences ? Thank you. Dave Phelan An AHJ in New Jersey _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum
