Extract or supply roof fan for ventilation of rooms with low air pollution. Impeller made of plastic (TH 500, 800) or sheet steel (TH 1300, 2000). The canopy of the TH 500 and 800 is made of sheet steel, the TH 1300 and 2000 of aluminium, the base plate of sheet steel. Metal elements are protected against corrosion with epoxy-polyester paint.

Fans for exhaust operation (air outlet) are mounted as standard. To change the operation to air supply, turn the module with the rotor 180 °, remove the steering wheel and screw the fan elements again.