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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 1 percent of air quantity calculated at 2,000 fpm face velocity <br /> through damper and 4.0 inches wag.pressure differential. <br /> a. Damper operators are specified,in Division 15 Section 15970 `Energy Management and Control <br /> Systems'. <br /> b. Dampers for outside, and exhaust air shall be low leakage, insulated Tamco Series 9000, no <br /> substitute. <br /> c. Dampers for return air,or bypass shall be Tamco Series 1000,no substitute. <br /> G. Filter Section: <br /> 1. General: Filters shall comply with NFPA Standard 90A "Standard for the Installation of Air <br /> Conditioning and Ventilating System <br /> 2. 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 <br /> with filtering media encased in fiberboard cell sides having perforated metal grids on each face to <br /> provide media support Airflow resistance with clean media shall not exceed 0.10 inch wag.at face <br /> velocity of 300 fpm, and filter arsenate efficiency of 70 to 82 percent based on ASHRAE Test <br /> Standard 52-Method of Testing Air-Cleaning Devices Used in General Ventilation for Removing <br /> 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 I <br /> fibrous media material constructed so that individual pleats are maintained in tapered form by <br /> flexible internal supports under rated air flow conditions. Construct holding frames of 18 gauge <br /> galvanized steel and provide suitable fasteners and gasketmg to hold filter units and prevent <br /> unfiltered air particles between media frames and holding devices. Design holding frames which <br /> are suitable for bolting together into built-up filter banks. Provide filters with rate face velocity of <br /> 500 fpm, initial resistance of 0.25"wag.with 60-65%dustpot efficiency, 0.40"wag. with 80-85% )� <br /> efficiency,and 0.70"w.g.with 90-95%efficient,with final rated resistance of 1.0'wag. <br /> H. Vibration Control: <br /> 1. Seismic Spring Isolators with Snubbers: Except as otherwise indicated, provide 2" vibration spring <br /> isolators between telescoping steel housing with top and bottom loading plates, and with pad-type <br /> isolator bonded to bottom of loading plate. <br /> a. Equip top loading plate with equipment anchors as indicated or as required for support and <br /> attachment. <br /> b. Include pad-type isolator bonded on top of top loading plate,except on units with leveling bolts. <br /> c. Include holes in bottom plate for bolting unit to substrate. <br /> 15854-6 No.99132-CP2 <br />