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a. General: Sound power level ratings shall comply with AMCA Standard 301 "Method for Calculating <br /> Fan Sound Ratings From Laboratory Test Data"and shall be the result of tests made in accordance with <br /> AMCA Standard 300"Test Code for Sound Rating." Fans shall be licensed to bear the AMCA Certified <br /> Sound Ratings Seal. <br /> b. Unit's fans performance ratings for flow rate, pressure, power, air density, speed of rotation, and <br /> efficiency shall be factory tested and ratings established in accordance with AMCA Standard <br /> 210/ASHRAE Standard 51 -Laboratory Methods of Testing Fans for Rating. <br /> 2. Fan Section Construction: Fan section shall be equipped with a formed steel channel base for integral <br /> mounting of fan,motor,and casing panels. The fan scroll,wheel,shaft,bearings,and motor shall be mounted <br /> on a structural steel frame with frame mounted on base with vibration isolators. <br /> 3. Fans and Shafts: Statically and dynamically balanced and designed for continuous operation at the maximum <br /> rated fan speed and motor horsepower. Fan wheel shall be double-width, double-inlet type with forward- <br /> curved blades or backward-curved airfoil section blades as indicated. Forward-curved blade wheels shall be <br /> galvanized steel or bonderized steel painted with baked-enamel finish Airfoil wheels shall be steel painted <br /> with zinc chromate primer and an enamel finish coat. Fan shaft shall be solid steel, turned, ground, and <br /> polished. Fan wheels shall be keyed to the shaft <br /> 4. Shaft Bearings: Grease-lubricated ball bearings selected for 200,000 hours'average life, with grease fittings <br /> extended to an accessible location outside the fan section. <br /> 5. Fan Drives: Designed for a 1.4 service factor and factory mounted with final alignment and belt adjustment <br /> made after installation. <br /> a. Belt Drive. Motors and fan wheel pulleys shall be adjustable pitch for use with motors up to and <br /> including 15 HP and fixed pitch for use with motors larger than 15 HP. <br /> b. Motors mounted on the outside of the fan cabinet shall have steel belt guards per OSHA Standards. <br /> D. Motors: <br /> 1. Torque Characteristics: Sufficient to accelerate the driven loads satisfactorily. <br /> 2. Motor Sizes: Minimum size as indicated. If not indicated, large enough so that the driven load will not <br /> require the motor to operate in the service factor range. <br /> 3. Temperature Rating: 50 deg C maximum temperature rise at 40 deg C ambient for continuous duty at full load <br /> (Class A Insulation). <br /> 4. Service Factor: 1.15 for polyphase motors and 1.35 for single-phase motors. <br /> 5. Motor Construction: NEMA Standard MG 1,general purpose,continuous duty,Design B. <br /> a. Bases: Adjustable. <br /> b. Bearings: The following features are required: <br /> 1) Ball or roller bearings with inner and outer shaft seals. <br /> 2) Grease lubricated. <br /> 3) Designed to resist thrust loading where belt drives or other drives produce lateral or axial thrust in <br /> motor. <br /> 158548 No.99132-CP2 <br />