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Blade pitch angles shall be factory set. C. Axial impeller hub shall be designed to incorporate a split taper bushing, and be keyed directly to drive shaft. 4 44. ..0 00 F FFA AAN NN M MMO OOT TTO OOR RR A AAN NND DD D DDR RRI IIV VVE EE A. Motor shall be TEFC industrial duty and conform to NEMA standards. B. Motor shall be of voltage, horsepower, RPM and enclosure as indicated on the fan schedule. C. Fan sheaves shall be cast iron and appropriately sized and aligned. D. Fan belts shall be static conducting, plus oil and heat resistant. E. Fan shaft shall be steel, turned, ground and polished. F. Fan shaft bearings shall be lubricated, self-aligning ball type in cast iron pillow block mounts with external grease fittings. 5 55. ..0 00 O OOP PPT TTI IIO OON NNA AAL LL F FFA AAN NN A AAC CCC CCE EES SSS SSO OOR RRI IIE EES SS A. Where indicated, fan shall be provided with the following optional accessories: • Disconnect switches – mounted, or mounted and wired • Variable pitch sheaves -NEMA 3R non-fused • Pre-fabricated roof curbs -NEMA 4X non-fused • 2” disposable filters, for filtered intake unit • Motors • Motor operated damper (supply or exhaust) - Explosion proof • Gravity shutter for exhaust only - Special duty • Custom curb base • Protective coatings • Inspection door - Epoxy - Eisenheiss 6 66. ..0 00 F FFA AAN NN T TTE EES SST TTI IIN NNG GG A. Axial impeller shall be balanced and mounted in fan assembly. B. Fan assembly shall be run and tested prior to shipment. C. A test report shall be maintained on file for each individual fan. HRV-0904 HRV HOODED ROOF VENTILATORS ...

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