The Helios HVR 150/2 RE Heliovent fan is a wall-mounted room ventilator designed for installation in walls, shafts, and windows. It can be used in openings with a diameter of 150 mm for ventilating small to medium-sized rooms. The fan features a plastic housing with a louvered grille that covers the intake opening. It is equipped with a powerful axial impeller with 8 plastic blades. The single-phase AC capacitor motor has a closed design, is maintenance-free, and includes thermal contacts integrated into the winding. The speed can be controlled by reducing the voltage, and it has sealed, low-noise ball bearings with long-term lubrication. The fan is also reversible.