4 Inch High-Speed Exhaust Fan In-Line Duct Kitchen Extractor Metal Toilet Fan Industrial Fan Blower Fan ,High-Efficiency

Fluted on both ends to receive ducting Balanced metal blades are for boosting air supply and venting exhaust air Engineered for maximum boost with minimum noise Household applications: help to boost airflow in HVAC units to remove exhausts and odors from bathrooms and workshops and ventilate basements and attics, etc. Grow room applications: used as intake fan to bring fresh air into grow rooms.