NFPA 13 2010: A.8.6.5.1.2 The intent of 8.6.5.1.2(3) is to apply to soffits that are located within the 18 in. (457 mm) plane from the sprinkler deflector. A soffit or other obstruction (i.e., shelf) located against a wall that is located entirely below the 18 in. (457 mm) plane from the sprinkler deflector should be in accordance with 8.6.5.3.3. (See Figure A.8.6.5.1.2.)
8.6.5.3.3 is simply the "obstructions over 4' wide" rule. So long as the shelf is more than 18" below the deflector and less than 4' wide it can be ignored. Mike Morey, SET, CFPS Sprinkler Designer BMW Constructors, Inc. O: 317.651.0596 | C: 317.586.8111 www.bmwc.com ________________________________ From: [email protected] on behalf of [email protected] Sent: Wed 4/25/2012 10:10 AM To: [email protected] Subject: Residential Utility Closet 2'-10" x 2'-10" closet with 9 ft ceiling. A full width and depth shelf is at 4'-2" above the floor. AC unit sits on the shelf and water heater is below, there is a typical 6'-8" door on the closet . Applicable code is 2002 NFPA #13. The inspector is insisting that we add sprinkler beneath the shelf to cover the water heater because of the obstruction from the shelf supporting the AC. Of course it is near the end of the project and this is the first time the issue has been raised. We pointed out that 6.4.6.3.1 in 13R (2010) and the handbook says one head is enough in 400 sqft. closet. The inspector says that 13R doesn't apply and that 13 is blah blah blah. He is technically correct but holy cow 2 heads in a six square feet closet? I thought that if I could find the ROP and ROC for what is currently 6.4.6.3.1 in 13R that there would be something in the substantiation we could send to the inspector. Or do you think the inspector is right, do we need another sprinkler? Ron Fletcher Aero Automatic Phoenix, AZ _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum -------------- next part -------------- A non-text attachment was scrubbed... Name: winmail.dat Type: application/ms-tnef Size: 5135 bytes Desc: not available URL: <http://fireball.firesprinkler.org/mailman/private/sprinklerforum/attachments/20120425/a915c174/attachment.bin> _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum
