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Guide Specification for Page: 17 <br /> WYORK Prestige <br /> a. Shall be a direct-driven propeller type fan. <br /> b. Shall have aluminum blades riveted to corrosion-resistant steel spiders and shall be dynamically balanced. <br /> 23 81 19. 13.0 Special Features Options and Accessories <br /> 1. IntelliSpeed-Staged Air Volume System (ZX12,ZX14,&ZY12) <br /> a. Evaporator fan motor: <br /> (1.) Shall have permanently lubricated bearings. <br /> (2.) Shall have a maximum continuous bhp rating for continuous duty operation; no safety factors above that <br /> rating. <br /> (3.) Shall be Variable Frequency duty and 2-speed control. <br /> (4.) Shall contain motor shaft grounding ring to prevent electrical bearing fluting damage by safely diverting <br /> harmful shaft voltages and bearing currents to ground. <br /> 2. Variable Frequency Drive(VFD). Only available on 2-speed indoor fan motor option (IntelliSpeed) <br /> INSERT MITSUBISHI DRIVE SPECIFICATIONS <br />