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KAISER PERMANENTE Site Prep #1 Electrical Service <br />ASC & Clinic (HUB) March 18, 2020 <br />Everett, WA Project No. 19.05002.00 <br />B. Description: Belt -driven centrifugal fans consisting of housing, wheel, fan shaft, bearings, <br />motor, drive assembly, and support structure. <br />C. Construction: Minimum 11-gauge marine alloy aluminum, bolted and welded <br />construction with inlet and outlet flanges. <br />1. Straightening vanes. <br />2. Brackets suitable for horizontal or vertical mounting. <br />D. Fan Wheel: Aluminum airfoil wheel welded to spun aluminum dome, bolted to aluminum <br />hub assembly, hub keyed and locked to fan shaft. <br />E. Motor: Heavy duty type with permanently lubricated sealed ball bearings. <br />Open drip proof. <br />F. Bearings: Heavy duty regreasable ball type, pillow block cast iron housing, minimum L50 <br />life in excess of 200,000 hours. <br />G. Belt Drives: Factory mounted, with final alignment and belt adjustment made after <br />installation. <br />1. Service Factor Based on Fan Motor: 1.5. <br />2. Fan Pulleys: Cast iron or cast steel with split, tapered bushing, dynamically <br />balanced at factory. <br />3. Motor Pulleys: Adjustable pitch for use with motors through 5 HP; fixed pitch for <br />use with motors larger than 5 HP. Select pulley so pitch adjustment is at the <br />middle of the adjustment range at fan design conditions. <br />4. Belts: Oil resistant, nonsparking, and nonstatic; matched sets for multiple belt <br />drives. <br />5. Belt Guards: Fabricate to comply with OSHA and SMACNA requirements; <br />0.1046-inch- thick, 3/4-inch diamond -mesh wire screen welded to steel angle <br />frame or equivalent, prime coated. Secure to fan or fan supports without short <br />circuiting vibration isolation. Include provision for adjustment of belt tension, <br />lubrication, and use of tachometer with guard in place. <br />6. Motor Mount: Adjustable for belt tensioning. <br />H. Accessories: <br />1. Scroll Access Doors: Shaped to conform to scroll, with quick -opening latches <br />and gaskets. <br />2. Companion Flanges: Galvanized steel, for duct connections. <br />3. Fixed Inlet Vanes: Steel, with fixed cantilevered vanes welded to inlet bell. <br />4. Inlet Screens: Galvanized steel welded grid screen, mounted inside shaft <br />bearings. <br />5. Scroll Drain Connection: 1-inch steel pipe coupling welded to low point of fan <br />scroll. <br />6. Shaft Cooler: Metal disk between bearings and fan wheel, designed to dissipate <br />heat from shaft. <br />7. Spark -Resistant Construction: AMCA 99 construction, as indicated. <br />8. Shaft Seals: Airtight seals installed around shaft on drive side of single -width <br />fans. <br />9. Weather Cover: Heavy -gage steel sheet with ventilation slots, bolted to housing. <br />10. Split pillow block bearings selected for a minimum of 400,000 hours average life <br />at the maximum RPM of each pressure class. <br />FANS 23 34 00 - 4 <br />