This versatile inline booster fan is made to be installed in between ducting for various applications that need improved gas delivery. In households, it boosts airflow from HVAC units to remove stale gas and odor, ventilating attics, workshops, kitchens, basements, etc. In grow tents, grow rooms, and indoor gardens, it's primarily used as an intake fan to bring in fresh gas. Features: Stable Operation: The inline booster duct fan has a strong pure copper motor that features a permanently lubricated bearing that operates with enough power and safety, and requires no complicated maintenance. Durable Construction: The high-quality metal housing makes the ventilation fan sturdy and built to last. Unibody die-cast construction with no welded seams; reduces vibration while ensuring smoother airflow. Compact But Efficient: This duct fan is compact and lightweight enough to be installed in areas with little available space; With three diameters of 4/6/8 inches, a speed of 2800 RPM, and 174 CFM airflow. Low Noise: Superior balanced centrifugal impeller for long service life & quiet operation; A less than 50 dB noise level does not have any harm and will not disturb your work or life, making it suitable for any application. Wide Applications: You can have it in kitchens, bathrooms, hotels, workshops, basements, attics, etc. in order to boost airflow in HVAC systems; Also, it can be used in grow rooms as an intake fan or exhaust fan. Specifications: Type: 4 Inch, 6 Inch, 8 Inch (Optional) Material: Metal Color: Black Item Size: 73 * 100 * 100mm/2.87 * 3.94 * 3.94in Item Weight: 500g/17.64oz Package Size: 170 * 90 * 80mm/6.69 * 3.54 * 3.15in Package Weight: 550g/19.4oz Packing List: 1*Duct Fan