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DUCTWORK <br />Section 15890 <br />15-1207 <br />8"0 Straight Duct — 3 Feet Length <br />Insertion Losses DB / Octave Band Center Frequency Hz <br />125 <br />250 <br />500 <br />1,000 <br />2,000 <br />4,000 <br />2.8 <br />5.4 <br />5.8 <br />6.0 <br />5.6 <br />4.6 <br />8"0 Straight Duct — 6 Feet Length <br />Insertion Losses DB / Octave Band Center Frequency Hz <br />125 <br />250 <br />500 <br />1,000 <br />2,000 <br />4,000 <br />5 <br />16 <br />17 <br />18 <br />16 <br />11 <br />12"0 Straight Duct — 3 Feet Length <br />Insertion Losses (DB) / Octave Band Center Frequency (Hz) <br />125 <br />250 <br />500 <br />1,000 <br />2,000 <br />4,000 <br />3.5 <br />5.6 <br />5.0 <br />5.8 <br />5.2 <br />4.3 <br />12"0 Straight Duct — 6 Feet Length <br />Insertion Losses DB / Octave Band Center Frequency Hz <br />125 250 500 1,000 2,000 4,000 <br />8 17 14 18 14 11 <br />Provide acoustical submittal data for 8"0 and 12"0 ducts within submittal package. <br />C. Minimum length of three feet and a maximum length of five feet to be installed at each air <br />terminal. Flexible duct shall have no bends greater than 90 degrees and shall be long <br />radiuses bends. Specifications and any applicable drawings or details will be strictly <br />enforced. Submittals to provide acoustical characteristics of flexible ductwork. <br />D. Make connections to rigid ductwork with Panduit style draw band. Provide one draw -band <br />at inner liner and a second draw band over the outer vapor barrier material. <br />PART 3 - EXECUTION <br />3.01 INSTALLATION OF DUCTWORK: <br />A. Assemble and install ductwork in accordance with recognized industry practices which will <br />achieve air tight (leakage class 12 for 2 -inch pressure class and leakage class 3 for 4 -inch <br />pressure class) and noiseless (no objectionable noise) systems capable of performing each <br />indicated service. Install each run with minimum of joints. Align ductwork accurately at <br />connections within 1/8- inch misalignment tolerance and with internal surfaces smooth. <br />Support ducts rigidly with suitable ties, braces, hangers, and anchors of type which will hold <br />ducts true to shape and to prevent buckling. <br />B. Seal ductwork after installation to seal class required and method prescribed in SMACNA <br />"HVAC Leakage Test Manual," latest edition. <br />C. Paint inside of duct visible through grille dull black. <br />D. Duct Supports: <br />0 <br />