Knut Bø MURO 100 K-12V is a 12 V SELV bathroom extract fan with a 4-inch (100 mm) duct connection and an integral gravity damper. The low-voltage design is intended for wet-zone installations where safety extra-low voltage is required, delivering approximately 90 m³/h air volume unloaded. The damper prevents backdraft when the fan is off, suitable for residential bathrooms and utility rooms.