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1) Coils with more than 12 circuits shall have two distributors. <br /> 2) Split circuit coils shall have two distributors. <br /> F. Dampers: <br /> 1. General: Leakage rate when tested in accordance with AMCA Standard 500 - Test Method for Louvers, <br /> Dampers and Shutters,shall not exceed 2 percent of air quantity calculated at 2,000 fpm face velocity through <br /> damper and 4.0 inches w.g.pressure differential. <br /> a. Damper operators are specified in Division 15 Section 15970 "Energy Management and Control <br /> Systems". <br /> 2. Provide inlet guide vane dampers as indicated or required. <br /> G. Filters Section: <br /> 1. General: Filters shall comply with NFPA Standard 90A"Standard for the Installation of Air Conditioning and <br /> Ventilating Systems." <br /> 2. Access Doors: Same material as cabinets complete with hinges,latches,handles and gaskets. <br /> 3. Extended Surface Filters: Provide filter section and media as indicated. <br /> a. Pre-Filters: Provide disposable type air filters 2 inches thick, consisting of viscous coated fibers with <br /> filtering media encased in fiberboard cell sides having perforated metal grids on each face to provide <br /> media support Airflow resistance with clean media shall not exceed 0.10 inch w.g. at face velocity of <br /> 300 fpm, and filter arrestance efficiency of 70 to 82 percent based on ASHRAE Test Standard 52 - <br /> Method of Testing Air-Cleaning Devices Used in General Ventilation for Removing Particulate Matter. <br /> b. Extended Surface Self-Supporting Filters: Provide factory-fabricated, dry, extended surface self- <br /> supporting filters with holding frames; where indicated, in sizes indicated. Equip with UL Class 1 <br /> fibrous media material constructed so that individual pleats are maintained in tapered form by flexible <br /> internal supports under rated air flow conditions. Construct holding frames of 18-ga galvanized steel and <br /> provide suitable fasteners and gasketing to hold filter units and to prevent unfiltered air passing between <br /> media frames and holding devices. Design holding frames which are suitable for bolting together into <br /> built-up filter banks. Provide filters with rated face velocity of 500 fpm, initial resistance of 0.25"w.g. <br /> with 60-65% dustspot efficiency, 0.40" w.g. with 80-85% efficiency, and 0.70" w.g. with 90-95% <br /> efficiency,and final rated resistance of 1.0"w.g. <br /> H. Vibration Control: <br /> 1. Spring Isolators, Housed: Except as otherwise indicated, provide vibration isolation spring between <br /> telescoping steel housings with top and bottom loading plates, and with pad-type isolator bonded to bottom of <br /> loading plate. Include resilient inserts to separate and guide telescoping housings. <br /> a. Equip top loading plate with equipment anchorages as indicated or as required for support and <br /> attachment <br /> b. Include pad-type isolator bonded to top of top loading plate,except on units with leveling bolts. <br /> c. Include holes in bottom plate for bolting unit to substrate. <br /> 2.05 EXTRA MATERIALS <br /> A. Furnish one additional complete set of belts for each central-station air-handling unit <br /> 15854-10 No.99132-CP2 <br />