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• <br /> SEISMIC BRACING NOTES <br /> HVAC DUCT AND MECHANICAL COMPONENTS <br /> 1. In compliance with the 2012 IBC and the 2015 IBC, seismic bracing is to be installed on <br /> all suspended HVAC duct runs and mechanical components per ISAT's engineered <br /> bracing tables, ISAT's installation details and the following criteria. <br /> BRACING REQUIREMENTS FOR SUSPENDED HVAC DUCT <br /> AND MECHANICAL COMPONENTS <br /> Seismic <br /> Design ip a Service Bracing Requirements <br /> Category <br /> A and B All No Bracing Required <br /> C 1.0 No Bracing Required <br /> Brace All Duct Designed To Carry Or Convey Toxic, Highly <br /> C > 1.0 Toxic Or Flammable Gases Or Used For Smoke Control. <br /> and <br /> D, E, F > 1.0 Brace All Duct Having A Cross-Sectional Area > 6 ft2 Or <br /> Weighing > 17 Lbs/LF. <br /> a. 1p= Component Importance Factor. <br /> 2. Where component 1p = 1.0, seismic restraints are not required for: <br /> a. Components weighing < 20 lbs (75 lbs, OSSC) or distributed systems < 5 lb/If <br /> having flexible connections between equipment and associated utilities. <br /> b. Floor supported components weighing less than 400 lbs., with a center of mass <br /> located 4 ft or less above the adjacent floor, the component is attached via flexible <br /> connections between itself and associated utilities (conduit, piping, etc.) and the <br /> component is positively attached to the floor (ASCE 7-10, 13.1.4 -6.c.) except <br /> components requiring Special Seismic Certification. <br /> 3. Components that are installed in-line with the duct system and have an operating weight <br /> greater than 75 lbs (334N), such as fans, heat exchangers and humidifiers, shall be <br /> supported and laterally braced independent of the duct system. <br /> frfr9-d <br /> International Seismic Application Technology <br /> 14848 Northam Street,La Mirada, CA 90638 <br /> 877-999-4728 (Toll Free) 714-523-0845(fax) <br /> www.isatsb.com <br /> O,y9 <br /> Rev. 1 <br /> j$5.4,a a 10/01/14 <br /> Page <br /> S4710 na 9 <br /> 9.1 <br /> 'f OF c poFt. 2012/15 IBC <br />