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DocuSign Envelope ID: 9826C043- 4C32- 49CD- A4CC- DC28ABAB7CE7 <br />SECTION 239300 - HVAC POWER VENTILATORS <br />3. Wall Grille: Ring type for flush mounting. <br />4. Dampers: Counterbalanced, parallel- blade, backdraft dampers mounted in wall <br />sleeve; factory set to close when fan stops. <br />5. Motorized Dampers: Parallel -blade dampers mounted in curb base with electric <br />actuator; wired to close when fan stops. <br />2.3 CEILING - MOUNTING VENTILATORS <br />A. Products: Basis of Design and Comparable Products as shown on Drawings. <br />B. Description: Centrifugal fans designed for installing in ceiling or wall or for concealed in- <br />line applications. <br />C. Housing: Steel, lined with acoustical insulation. <br />D. Fan Wheel: Centrifugal wheels directly mounted on motor shaft. Fan shrouds, motor, and <br />fan wheel shall be removable for service. <br />E. Grille: Plastic, louvered grille with flange on intake and thumbscrew attachment to fan <br />housing. <br />F. Electrical Requirements: Junction box for electrical connection on housing and receptacle <br />for motor plug -in. <br />G. Accessories: <br />1. Manual Starter Switch: Single -pole rocker switch assembly with cover and pilot <br />light. <br />2. Time -Delay Switch: Assembly with single -pole rocker switch, timer, and cover <br />plate. <br />3. Motion Sensor: Motion detector with adjustable shutoff timer. <br />4. Ceiling Radiation Damper: Fire -rated assembly with ceramic blanket, stainless -steel <br />springs, and fusible link. <br />5. Filter: Washable aluminum to fit between fan and grille. <br />6. Isolation: Rubber -in -shear vibration isolators. <br />7. Manufacturer's standard roof jack or wall cap, and transition fittings. <br />2.4 IN -LINE CENTRIFUGAL FANS <br />A. Product: Basis of Design and Comparable Products as shown on Drawings. <br />B. Description: In -line, direct or belt - driven centrifugal fans consisting of housing, wheel, <br />outlet guide vanes, fan shaft, bearings, motor and disconnect switch, drive assembly, <br />mounting brackets, and accessories. <br />C. Housing: Split, spun aluminum with aluminum straightening vanes, inlet and outlet <br />flanges, and support bracket adaptable to floor, side wall, or ceiling mounting. <br />D. Direct- Driven Units: Motor mounted in airstream, factory wired to disconnect switch <br />located on outside of fan housing; with wheel, inlet cone, and motor on swing -out service <br />door. <br />Reece, Noland & McElrath, Inc. 239300-3 Orange County Board of Elections <br />Orange Co., NC 05/04/18 <br />