The Blauberg 250mm & 315mm silenced mixed flow fan are a quality German made fan with a two speed controller. The Blauberg is designed for moving large amounts of air and is more powerful than a centrifugal fan of the same diameter.
Single phase ball bearing motor
Thermal overload protection with automatic restart
Maximum airflow 1360 m3/h for the 250mm
Maximum airflow 1750 m3/h for the 315mm 1.42 amps
This is a serious fan for serious growers!