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DocuSign Envelope ID: 9826C043- 4C32- 49CD- A4CC- DC28ABAB7CE7 <br />SECTION 239300 - HVAC POWER VENTILATORS <br />2. Camlock fasteners at subbase. <br />D. Fan Wheels: Aluminum hub and wheel with backward- inclined blades. <br />E. Belt- Driven Drive Assembly: Resiliently mounted to housing, with the following features: <br />1. Fan Shaft: Turned, ground, and polished steel; keyed to wheel hub. <br />2. Shaft Bearings: Permanently lubricated, permanently sealed, self - aligning ball <br />bearings. <br />3. Pulleys: Cast -iron, adjustable -pitch motor pulley. <br />4. Fan and motor isolated from exhaust airstream. <br />F. Accessories: <br />1. Disconnect Switch: Nonfusible type, with thermal- overload protection mounted <br />inside fan housing, factory wired through an internal aluminum conduit. <br />2. Bird Screens: Removable, 1/2 -inch mesh, aluminum or brass wire. <br />3. Dampers: Counterbalanced, parallel- blade, backdraft dampers mounted in curb <br />base; factory set to close when fan stops. <br />4. Motorized Dampers: Parallel -blade dampers mounted in curb base with electric <br />actuator; wired to close when fan stops. <br />G. Roof Curbs: Galvanized steel; mitered and welded corners; 1 -1/2 -inch- thick, rigid, <br />fiberglass insulation adhered to inside walls; and 1 -1/2 -inch wood nailer. Size as required <br />to suit roof opening and fan base. <br />1. Minimum Height: 12 inches. <br />2. Sound Curb: Curb with sound - absorbing insulation matrix. <br />3. Pitch Mounting: Manufacture curb for roof slope. <br />4. Metal Liner: Galvanized steel. <br />5. Mounting Pedestal: Galvanized steel with removable access panel. <br />6. Vented Curb: Unlined with louvered vents in vertical sides. <br />2.2 CENTRIFUGAL WALL VENTILATORS <br />A. Products: Basis of Design and Comparable Products as shown on Drawings. <br />B. Description: Direct- or belt - driven centrifugal fans consisting of housing, wheel, fan shaft, <br />bearings, motor and disconnect switch, drive assembly, and accessories. <br />C. Housing: Heavy -gage, removable, spun - aluminum, dome top and outlet baffle; venturi <br />inlet cone. <br />D. Fan Wheel: Aluminum hub and wheel with backward- inclined blades. <br />E. Belt- Driven Drive Assembly: Resiliently mounted to housing, with the following features: <br />1. Fan Shaft: Turned, ground, and polished steel; keyed to wheel hub. <br />2. Shaft Bearings: Permanently lubricated, permanently sealed, self - aligning ball <br />bearings. <br />3. Pulleys: Cast -iron, adjustable -pitch motor pulley. <br />4. Fan and motor isolated from exhaust airstream. <br />F. Accessories: <br />1. Disconnect Switch: Nonfusible type, with thermal- overload protection mounted <br />inside fan housing, factory wired through internal aluminum conduit. <br />2. Bird Screens: Removable, 1/2-inch mesh, aluminum or brass wire. <br />Reece, Noland & McElrath, Inc. 239300-2 Orange County Board of Elections <br />Orange Co., NC 05/04/18 <br />