NFPA 33 2011 9.4.6 Sprinklers systems protecting stacks or ducts shall meet all of the following requirements: (1) Sprinklers shall be spaced no more than 12' apart.
Since the standard doesn't differentiate between vertical or horizontal duct then I interpret it to require sprinklers to spaced 12' on the vertical as well as horizontal. Ryan Peterson Wayne Automatic fire Sprinklers 407-877-5593 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of A.P.Silva Sent: Tuesday, February 01, 2011 2:55 PM To: [email protected] Subject: Exhaust ducct I normally provide one head at the top of a vertical exhaust stack coming off a paint booth. The vertical duct is about 25 feet high. The booth manufacturer says there should be two heads as maximum spacing on vertical duct is 20 feet. Is this normal? Tony _______________________________________________ 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)
