I don't know they ever got listed. I was at an NFPA conference in mid '90's where mfg (can't recall which one) had such a beast and tested it out to all the requirements successfully. I recall 30x30 but don't trust my memory. NFPA committee reacted with NO WAY! Fear was the size of an area should a single head fail to open. All fully acknowledged systems weren't designed for this scenario but also the reality limiting the potential area of failure gave a chance it would still be controlled. This was before the o-ring issue came to light. So I'm sure that sealed the deal until at least my generation retires.
Chris Cahill, PE* Associate Fire Protection Engineer Burns & McDonnell Phone: 952.656.3652 Fax: 952.229.2923 [email protected] www.burnsmcd.com *Registered in: MN Proud to be #14 on FORTUNE's 2014 List of 100 Best Companies to Work For -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Matt Grise Sent: Tuesday, August 26, 2014 2:47 PM To: [email protected] Subject: extended coverage heads over 400sf I have heard that there was a time before NFPA 13 limited sprinkler coverage to 400 sf that some heads were listed for 22x22 or 24x24 (or some other combination that exceeded 400sf). just for curiousity - Does anyone have any info on these? Matt Grisé PE*, LEED AP, NICET II Sales Engineer Alliance Fire Protection 130 w 9th Ave. North Kansas City, MO 64116 *Licensed in KS & MO 913.888.0647 ph 913.888.0618 f 913.927.0222 cell www. AFPsprink.com _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
