MOISTURE-PROOF: New trend of 12v dc moisture-proof fan to be designed for high humidity (80%)cooling vent project,verified test up to 4cm water for 4 hours. DUAL BALL BEARING: 120mm mini ac powered high cfm fan with long lasting dual ball bearing up to 60000 hours over 6 years. VARIABLE SPEED CONTROLLER: With 3v-12v ac powered speed controller to achieve different airflow(28-88CFM) and noise level needs(20-46.5d BA). 100V-240V PLUG: Increased maximum fan speed and enabled fan to be powered throu

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