Ziehl 350mm

The KS3504E is a 350mm diameter 4-pole axial fan made in Germany by Ziehl-Abegg.
It has a flow rate of 750 litres per second and is designed to be mounted inline. That is, mounted in ducting.
Because it has a 4-pole motor it makes it one of the quietest 350mm axial fans on the market without compromising the airflow.
The KS3504E comes with a three year warranty and like all Ziehl fans, it is built to last.