Laserfiche WebLink
SEISMIC BRACING NOTES <br /> HVAC DUCT AND MECHANICAL COMPONENTS (CONT'D) <br /> 9. Design duct for the displacements across seismic joints, regardless of size, weight or <br /> where hanger length < 12 inches. <br /> 10. Plastic or fiberglass ductwork shall be braced at one-half the spacing identified in the <br /> ISAT bracing charts for the equivalent weight metal duct. <br /> 11 . All seismic bracing assemblies shall utilize ISAT supplied, proprietary seismic brackets <br /> unless noted otherwise. No Substitutions Allowed. Use of any substitute bracket voids <br /> all engineering. <br /> 12. Brace spacing shall not exceed the maximum allowable brace spacing as <br /> engineered by ISAT. Refer to individual ISAT bracing charts compiled by duct trapeze <br /> weight. See Index Page C.O. <br /> 13. Every HVAC duct run which requires bracing shall have a minimum of two transverse <br /> braces and one longitudinal brace. For the purposes of this Manual, a run is defined as <br /> a suspended element of 10 foot minimum straight length. <br /> 14. A transverse brace shall be installed on one side of a horizontal 90 degree change in <br /> duct direction. <br /> 15. A transverse brace may act as a longitudinal brace if it is located within two duct widths <br /> of a 90 degree change in direction, if the brace arm and anchor have been sized to <br /> meet or exceed the requirements of the longitudinal brace and the transverse brace is <br /> installed on the larger of the two ducts or as engineered by ISAT technical support. <br /> 16. A longitudinal brace may act as a transverse brace if it is located within two duct widths <br /> of a 90 degree change in direction, if the brace arm and anchor have been sized to <br /> meet or exceed the requirements of the transverse brace and the longitudinal brace is <br /> installed on the larger of the two ducts or as engineered by ISAT technical support. <br /> 17. See page 12.1 for special inspection requirements. <br /> 18. Flexible connections at walls are not allowed as Transverse Brace locations. <br /> 1171171111774 <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 /> ``° a ✓ e 10/01/14 <br /> Page <br /> 54710 m <br /> 9.3 <br /> f •t- <br /> OF CA,0- 2012/15 IBC <br />