Mars Hydro 4" Inline Duct Fan and Carbon Filter Combo with Temperature and Humidity Controller DUCTWORK They are free of prismatic

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Mars Hydro 4" Inline Duct Fan and Carbon Filter Combo with Temperature and Humidity Controller DUCTWORK They are free of prismaticDescription Ventilation System Includes: 4" Inline Duct Fan, 4" Carbon Filter, Thermostat Controller, 25 ft Flexible Duct Tube, 3 Duct Clamps, and 2 Hanging Straps. Smart Operation and Quiet Inline Fan: The Mars Hydro 4 inch inline fan features a PWM controlled EC powered motor and mixed flow design, delivering airflow up to 205 CFM quietly. Controlled by a digital touch screen thermostat controller with a sensor probe, it offers functions such as