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L <br /> 6. Round Gored Elbows Gages: Same as for non-elbow fittings specified above. <br /> 7.- Flat Oval Elbows Gages: Same as longitudinal seam flat oval duct <br /> L- <br /> 8. Pleated Elbows Sizes Through 14 Inches and Pressures Through 10 Inches: 26 gage. <br /> i <br /> PART 3: EXECUTION <br /> 3.01 DUCT INSTALLATION,GENERAL. <br /> A. Duct System Pressure Class: Construct and install each duct <br /> ys system for the specific duct pressure classification i <br /> indicated. — <br /> B. Install ducts with the fewest possible joints. <br /> i_ <br /> C. Use fabricated fittings for all changes in directions,changes in size and shape,and connections. <br /> D. Install couplings tight to duct wall surface with projections into duct at connections kept to a minimum <br /> E. Locate ducts,except as otherwise indicated,vertically and horizontally,parallel and perpendicular to building lines; <br /> avoid diagonal runs. Install duct systems in shortest route that does not obstruct usable space or block access for <br /> servicing building and its equipment. <br /> F. Install ducts close to walls,overhead construction, columns,and other structural and permanent enclosure elements <br /> of building. L <br /> G. Provide clearance of 1 inch where furring is shown for enclosure or conceahnent of ducts, plus allowance for <br /> insulation thickness,if any. <br /> L <br /> H. Install insulated ducts with 1-inch clearance outside of insulation. <br /> I. Conceal ducts from view in finished and occupied spaces by locating in mechanical shafts, hollow wall L. <br /> construction, or above suspended ceilings. Do not encase horizontal runs in solid partitions, except as specifically <br /> shown. <br /> J. Coordinate layout with suspended ceiling and lighting layouts and similar finished work i <br /> K Electrical Equipment Spaces: Route ductwork to avoid passing through transformer vaults and electrical equipment <br /> spaces and enclosures. <br /> L. Non-Fire-Rated Partition Penetrations: Where ducts penetrate interior partitions and exterior walls,and are exposed <br /> to view, conceal space between construction opening and duct or duct insulation with sheet metal flanges of same <br /> gage as duct. Overlap opening on 4 sides by at least 1-1/2 inches. — <br /> M. Fire Rated Walls: Where ducts penetrate fire rated walls,provide firestopping material as required to maintain wall <br /> fire rating. Comply with all firestopping manufacturers installation directions and guidelines. L <br /> N. Protect all ductwork and duct construction materials from damage,construction dust,moisture,and other sources.of <br /> contamination when stored on the site awaiting fabrication or installation. Provide clean plugs to seal openings in <br /> installed ductwork which might allow contaminants to enter. <br /> O. Install all duct mounted control and alarm devices furnished as work of other Division 15 sections. Work to include ' <br /> temperature sensors,dampers,thermostats,smoke detectors,safety switches and pressure sensors. `L <br /> 15891-8 No.99132-CP2 <br />