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SECTION 15800 � <br /> DUCTWORK MATERIALS <br /> AND METHODS , <br /> 1.00 GENERAL � <br /> A. All above ground ductwork material and construction shall be galvanized steel, installed <br /> in accordance with the Standards described in the latest edition of the ASHRAE <br /> (American Society of Heating, Refrigeration and Air Conditioning Engineers) Guide � <br /> and Data Book, SMACNA (Sheet Metal and Air Conditioning Contractor's National <br /> Association)and L.ocal governing mechanical codes . <br /> B. Kitchen exhaust ductwork to be 18 gauge steel with liquid tight weld. Duct to slope � <br /> 2°Io towards hood or an approved grease collector. Provide cleanouts as required, per <br /> Code. Installation of kitchen exhaust ductwork shall comply with NFPA, State and � <br /> Local Codes. <br /> C. Changes in direction, elevation or shape shall be made by gradual methods such as <br /> radiused elbows of diverging or converging reducing fittings. Changes in dimension ' <br /> shall not exceed 20° diverging angle. Elbow radii shall be at least equal to the width of <br /> the duct in the plain of the bend. <br /> D. Provide a minimum of 2" wide flexible connectors to all ducted equipment on all � <br /> equipment 2000 CFM or less and 4"on 2000 CFM and greater. <br /> E. Access Doors � <br /> 1. Where motorized dampers, fire dampers, control equipment are installed in <br /> ductwork, provide suitable sized, gasketed doors in ducts. Doors shall be <br /> provided with Ventlok #220 door pull and #90 sash type latches. Use sponge � <br /> rubber to felt gasketing material on door openings. Access doors in insulated <br /> ductwork shall be double wall construction with 1" insulation between wall. <br /> F. Air Control Devices � <br /> 1. Provide splitter dampers on all main ducts and where shown on the drawings. <br /> Provide Ventlok #690 or approved equal, self-locking splitter assembly on each � <br /> damper. <br /> 2. Provide Clevepak (or approved equal) Type DESC damper extractor with <br /> spin-collar at all branch take offs. <br /> 3. Furnish balancing dampers for each diffuser at the spin-collar. , <br /> G. Registers Grilles and Diffusers <br /> 1. Approved equals: Anemostat, Titus, J & J, Krueger, Tuttle and Bailey, Carnes, � <br /> Lima. <br /> 2. Type "A" sidewall supply registers shall be equal to Anemostat TAL2, 1/2" <br /> spacing, 15° deflection fins, coordinate mounting type with the contractor, <br /> provide custom finish, with O.B. damper. Coordinate custom color with interior � <br /> designer and architect. <br /> 3. Type "B" exhaust grille and return registers shall be equal to Anemostat S3HD, <br /> 45° horizontal fixed fins, 3/4" spacing, surface mount, steel. , <br /> H. Louvers <br /> 1. Provide Ruskin (Cesco, Air Balance) GFL800 extruded aluminum louvers. � <br /> Frame shall be 4" (0.080 wall thickness (2), with 606375 blades (0.063 wall <br /> 071497 CBA701 7/31/97 , <br /> 15800 - 1 <br /> , <br />