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KAISER PERMANENTE Site Prep #1 Electrical Service <br />ASC & Clinic (HUB) March 18, 2020 <br />Everett, WA Project No. 19.05002.00 <br />N. Non -Fire -Rated Partition Penetrations: Where ducts pass through interior partitions and <br />exterior walls, and are exposed to view, conceal space between construction opening <br />and duct or duct insulation with sheet metal flanges of same metal thickness as duct. <br />Overlap opening on four sides by at least 1-1/2 inches. <br />O. Fire -Rated Partition Penetrations: Where ducts pass through interior partitions and <br />exterior walls, install appropriately rated combination fire/smoke damper or fire damper <br />sleeve, and firestopping sealant. Fire, smoke and combination fire/smoke dampers are <br />specified in Division 23 Section "Duct Accessories." Firestopping materials and <br />installation methods are specified in Division 07 Section "Firestopping." <br />3.2 SEAM AND JOINT SEALING <br />A. General: Seal duct seams and joints according to the duct seal class described in <br />SMACNA "HVAC Duct Construction Standards --Metal and Flexible" corresponding to the <br />pressure class given below. <br />B. Pressure Classification: <br />1. 3-inch wg and Greater: Seal Class A; all transverse joints, longitudinal seams <br />and duct wall penetrations. <br />2. Below 3-inch wg: Seal Class B; all transverse joints and longitudinal seams. <br />C. Seal externally insulated ducts before insulation installation. <br />3.3 HANGING, RESTRAINING, AND SUPPORTING <br />A. Install rigid round, rectangular, and flat -oval metal duct with support systems indicated in <br />SMACNA "HVAC Duct Construction Standards --Metal and Flexible." <br />B. Install duct seismic restraints as indicated in Division 23, Section "Vibration and Seismic <br />Controls for Mechanical Piping and Equipment." <br />C. Support horizontal ducts within 24 inches of each elbow and within 48 inches of each <br />branch intersection. <br />D. Support vertical ducts at a maximum interval of 16 feet and at each floor. <br />E. Install upper attachments to structures with an allowable load not exceeding one-fourth of <br />failure (proof -test) load. <br />F. Install concrete inserts before placing concrete. <br />G. Install mechanical -anchor fasteners after concrete is placed and completely cured. Install <br />fasteners according to manufacturer's written instructions. <br />3.4 CONNECTIONS <br />A. Unless indicated otherwise, connect metal ducts to rotating equipment with flexible <br />connectors according to Division 23 Section "Air Duct Accessories." <br />B. For branch, outlet and inlet, and terminal unit connections, comply with SMACNA "HVAC <br />Duct Construction Standards --Metal and Flexible," unless indicated otherwise. <br />3.5 FIELD QUALITY CONTROL <br />A. Leakage Test: <br />Disassemble, reassemble, and seal segments of systems as required to <br />accommodate leakage testing and as required for compliance with test <br />requirements. <br />METAL DUCTS 2331 13 - 9 <br />