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Spider Farmer 6" Inline Duct Fan with Speed Controller Ventilation Microbial Soil Inoculant has beenDescription Quiet and Powerful: The mixed flow design and EC motor make this fan highly energy efficient compared to traditional inline fans. It consumes only 50 watts of power but provides a strong airflow of up to 350 CFM. The noise level is very low, producing only 32DB, making this 6 exhaust fan virtually silent. The lightweight ABS blades reduce airflow resistance and increase airflow by 40%. Built to Last: Made with a premium ABS plastic housing