Tube fans of series RFE and RFG are axial flow fans with integrated guide fan. Both sides of the fan can be fitted into the tube and be fixed with fast clamps.

The housing is made of injection molded PP in black. The series is designed in a way that by putting on a flange on each side of the housing the actual size becomes the next smaller size. Efficient storing facilities are the result. The fans have protection class IP 44. These fans have a 3-step single-phase motor. For simple controls, a step switch is sufficient. More fine tuned control can be achieved by standard controllers for single phase AC.