The 4" 195CFM Inline Duct Ventilation Fan by VIVOSUN is a powerful electric exhaust fan designed for use in hydroponics grow tents. With a durable ABS plastic construction and a sleek black color, this turbine-style ventilation system efficiently moves air with a volume of 195 CFM. Perfect for maintaining optimal air circulation and extraction in your grow space, this fan is a reliable and essential component for any indoor gardening setup.