Helios HVR 150/2 RE Heliovent fan is a flush-mounted room fan designed for installation in walls, shafts, and windows. It can be used in openings with NW 150 for the ventilation of small to medium-sized rooms. The fan features a plastic housing with a louvred grille to cover the intake opening. It is equipped with a high-performance axial impeller with 8 plastic blades. The single-phase AC capacitor motor has an enclosed design, is maintenance-free, and includes thermal contacts built into the winding. The speed can be controlled by voltage reduction, and it has sealed, low-noise ball bearings with long-term lubrication. The fan is also reversible.