4''6''8'' Duct Fan Air Ventilator Metal Pipe Ventilation Exhaust Fan Extractor Bathroom Toilet Wall Fan Air Blower Fan ,Energy-Efficient

Portable and lightweight, easy to install 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.