10 Best Duct Booster Fans 2025 in the United States

The AC Infinity CLOUDLINE A6 is a solid choice for anyone looking to enhance ventilation in spaces like grow tents, AV closets, or any area needing better air circulation. With an impressive airflow rate of 352 CFM and a noise level of just 34 dBA, it strikes a good balance between performance and quiet operation, making it suitable for both hobbyists and serious growers alike.

The AC Infinity CLOUDLINE PRO S6 is a solid choice if you need a quiet and efficient 6-inch inline duct booster fan. It delivers airflow at 402 CFM, which is strong enough to improve ventilation in spaces like grow tents, small rooms, or AV cabinets. One of its nicest features is how quiet it runs at just 32 dB—low enough not to be distracting in most indoor settings. Installation is straightforward with its 6-inch duct size, compatible with common ductwork, and it’s designed for indoor use only. You’ll appreciate the 10-speed wired controller, giving you good flexibility to adjust airflow as needed, plus compatibility with smart controllers if you want more advanced control options. Energy-wise, it uses a PWM-controlled EC motor, which means it runs efficiently, generating less heat and consuming less power compared to typical fans. The fan’s mixed flow design helps push air effectively even when duct resistance is high, which is important for maintaining good ventilation in tighter spaces.