Adjustable Speed Control Exhaust Fan for Ventilation Airflow Boosting Garden Farmland ,Easy to Use

Built with cutting edge brushless electronically commutated Motor (EC) motor and dual jet type impeller, our new 4" ECMF series fans deliver 350 Cubic Feet per Minute (CFM) of Airflow using only 18 Watts Quiet &SpeedadjustableUsing included speed controller ECMF series fans' speed can be adjusted from 0%-100% without creating any additional hum or background noise Aluminum housing: Resists accidental damage, harsh elements and reduces maintenance in demanding applications such as ventilation of grow tents, gardens, farms, crawl spaces, attics, etc Made of material, sturdy and durable. IP 44 waterproof for long time use.