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Fresh air is a crucial component for a healthy harvest. Growing plants transpire water vapor and moisture in the grow room which can cause high humidity that can stunt your plants and destroying your crop. Our duct fan can help you to maintain a healthy grow room by efficiently move large volumes of air throughout your ventilation system. iPower Duct Fan Inline Fan for Household / Grow Room Ventilation Item Specifications: -Diameter: 8inch ; -Power supply: 110/120V ; -Power: 42 W ; -Speed: 2970 RPM ; -Air flow: 420 CFM ; -Cord length: 5.5 feet ; -Noise level: 50 db ;