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SEISMIC BRACING NOTES <br /> HVAC DUCT AND MECHANICAL COMPONENTS (CONT'D) <br /> 19. Where a duct passes through a wall may be considered a transverse brace location <br /> provided the duct is tightly constrained and it is a rigid connection. The ability of a <br /> breakaway smoke damper to act as a transverse brace location is to be evaluated on a <br /> case-by-case basis. The Engineer of Record or the Project Architect must verify the <br /> ability of the wall to accommodate the transverse seismic load. <br /> 20. Vertical support spacing for trapeze mounted duct is to be the lesser of 10 foot <br /> maximum, or the maximum as dictated by the International Mechanical Code, as listed <br /> in the project specifications, or as allowed by the local code authority. <br /> 21 . Each layer of a multi-layer trapeze rack shall be braced individually based on the weight <br /> of the individual layer, or as specifically engineered by ISAT. Layers supporting loads <br /> < 10 lbs/If need not be braced provided that the load is accounted for in the nearest <br /> braced layer. <br /> 22. All vertical riser ducts shall include engineered lateral restraint and vertical supports at <br /> the top and bottom of the riser and at each intermediate floor not to exceed a maximum <br /> interval from the C-series Bracing Tables. The lateral seismic restraint and the vertical <br /> support shall be engineered on an individual project basis. <br /> 23. Vertical risers which are mechanically attached to floors at the point of penetration are <br /> considered a transverse and longitudinal brace location when the supports and <br /> anchorages are sized to accommodate the lateral load. <br /> 24. When used to construct a rigid brace arm assembly, minimum 12 gauge steel channel <br /> shall be solid. Punched or short slot channel may be used provided the reduced brace <br /> arm design values on Page El are accounted for. <br /> 1=1111417M <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 /> Rev. 1 <br /> `,4 a �Fy 10/01/14 <br /> e <br /> S4710 nb Page <br /> 9.4 <br /> *�9 F OF C PVP�Q p 2012/15 IBC <br />