iPower 4" Booster Fan The iPower 4" Booster Fan solves airflow issues without expensive re-work or replacement of existing inline fans. Easy to use and set up, our fans are a big hit for all types of tasks. High quality construction and materials make these fans last - you will become a fan of this product. Features Perfect for boosting air flow in long runs of ductingCome completely wired with junction box, strain relief, and power cordEnergy efficient and very quietLightweight and easy to installFluted on both ends to receive ductingBoxed in retail friendly packaging