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RFP 24-057 567-0702 I with PS-15, Table 5, at a design pressure of 25 psi, and will have a minimum of ANSI/ASME B16.1, Class 25 diameter and drilling. All bends and elbows will have a centerline radius of at least 1.5 times the inside diameter of the duct. An eccentric reducer will be installed on the main or primary duct immediately upstream of the wye fitting to increase the main duct size prior to the intersection with the lateral duct in locations where size changes occur at intersections. Alternate bend and fitting configurations may be considered by CITY or CITY'S representative on a case-by-case basis where existing site constraints prohibit installation of fittings shown on plans. c. Flange Bolts or Studs and Nuts: Type 316 stainless steel, sized such that, after installation, bolts will project 1/6- to 3/B-inch beyond the outer face of the nut. D. Flat Washers: Type 316 stainless steel. E. Flange Gaskets: Full face, ASTM 02240, Type A durometer 50-70, 1/6-inch minimum thickness, EPDM. I F. Bell-and-Spigot Joints: Matched tapered bell-and-spigot ends bonded with adhesive. G. Butt Joints: Butt and wrap, resin bonded, PS-15, with pressure rating equal to the duct. H. Expansion Joints: As specified herein. I. Adhesive: Duct manufacturer's standard. J. UV inhibitors: All duct, fittings, and appurtenances will contain ultraviolet (UV) inhibitors. All duct, fittings, supports and appurtenances will be painted to match the color of existing ductwork. 2.02 FABRICATION A. Joint Method: Unless otherwise specified, duct will have butt joints. Shop fabricated assemblies should be provided to the maximum extent possible, to minimize the number of field joints. I Flanged joints will be provided at each damper and item of equipment to facilitate disassembly, at each change in material, at road crossings and where indicated on the drawings. 15892-4