ASSEMBLY INSTRUCTION SPEED CONTROLLER The motor and rotor biased of the Inline Duck Fan should be Inspected every 6 months. Fan maintenance should be performed by capable person: . Tum off the power when cleaning or repairing the fan. After cleaning or repairs, please confirm the Integrity of the fan and ensure ail components are properly Installed before Ming ft on exasperating temperature and humidity Operating temperatures: to ; Operating humanity: 2.