The 4" Low Noise Inline Fan (150 CFM) is an efficient and quiet ventilation solution designed for ducted air movement in residential and light commercial applications. Installed directly within ducting, this inline fan effectively boosts airflow, removes stale air, odors, and moisture, and improves overall air circulation. Its low-noise operation makes it ideal for bathrooms, kitchens, grow rooms, laundry areas, and small ventilation systems where quiet performance is essential.