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2. Make sure that the electric service supply voltage is AC 110~220V, 50~60Hz. 3. Follow all local electrical and safety codes, as well as the Nation Electrical Code (NEC) and the Occupation Safety and Healthy Act (OSHA). 4. Always disconnect the power source before working on or near the ventilating fan, motor or junction box. 5. Protect the power cord from sharp edges, oil, grease, hot surfaces, chemicals or other objects. 6. Do not kink the power cord. 7. in Fig. A. 8. Provide suction parts w