The fan is another element which, apart from the AHU unit, controls the amount of the air diffused and exhausted indoors.
Depending on the needs, it is a duct or axial type fan, available in a polypropylene or sheet metal enclosure. The available diameters range from 100 to 315 mm, depending on the fan type and power.
The roof fans and the PD-B3 roof bases can work as independent ventilation units, e.g. for industrial rooms.