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MicroMall Quiet 6” Inline Duct Fan with 0-100% Variable Speed Controller - Ventilation Exhaust Fan Using for Heating Cooling Booster, Grow Tents, Hydroponics,Home use Ventilation and Exhaust Blower. Unlike common duct fans that uses an AC-motor which are loud and unmanageable, this duct fan features an EC-motor that is controlled using PWM (Pulse Width Modulation). Once installed, I … - features. 00 High CFM and blows well. 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