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I <br /> I <br /> � <br /> i <br /> I <br /> � <br /> • SECTIOO N 15890 - SHEET METAL DUCTWORK-LOW PRESSURE <br /> � <br /> PART 1'GENERAL <br /> i <br /> l.�l WORK INCLUDED <br /> � <br /> � A. Sheet Metal Low Pressure (operating at 2.00" w.�. total static <br /> ; pressure with velocities up to 2000 FPM) Ductwork. Duct, <br /> ; fittings, fasteners, supports and other system components in the <br /> � MRI Scan Room shall be non-ferrous. <br /> , B. Include matenals, ductwork,�omts,transrtions, sphtters, dampers, <br /> access doors, etc., necessary to install the low pressure sheet metal <br /> � ductwork required by the Contract Drawings. <br /> � <br /> 1�2 QUALITY CONTROL AND REGULATORY STANDARDS <br /> A. Provide an installed duct system which will supply the air <br /> quantities indicated by the plans and have minimum friction loss <br /> with minimum leakage. Friction losses for each system shall not <br /> exceed those indicated in the equipment and fan schedules and <br /> shall include the losses of all accessories. <br /> • ' <br /> � B. Friction losses shall be minimized by reduction in the number of <br /> � offsets and elbows by pre-planning the duct system installation and <br /> by coordination with other trades to prevent interferences. Access <br /> � to all accessories requiring maintenance, service and inspection <br /> � shall be maintained. Radius elbows are prefened for all turns, <br /> Iespecially, for sections having large volume or higher velocities <br /> � and sections which may have turbulence. <br /> I <br /> C. Ductwork installers shall have access on the construction site to <br /> SMACNA's "HVAC Duct Construction Standards, Metal and <br /> ' Flexible, Second Edition, 1995". This standard is refened to in <br /> � specifications for required construction methods and details. <br /> 1 Contractor shall comply with provisions of the SMACNA standard <br /> � and more stringent requirements of this specification. <br /> � D. Quality control involves not only the general performance li <br /> I <br /> i requirements for ductwork,but also quality workmanship, layout � <br /> � and preplanning so that offsets,rises, falls, elbows, fittings, etc., <br /> � are minimized or eliminated, and that ductwork installation is <br /> � coordinated with the work of other trades. General performance � <br /> • requirements for ductwork includes: <br /> ICT 99184 <br /> 15890 - 1 <br />