Air impellers for ventilation; Electric fans for ventilation; Electrical fans being parts of household ventilation installations; Electrically powered air blowers for ventilation purposes; Electrically powered blowers for ventilation; Electrically powered fans for ventilation purposes; Motorised fans for ventilation; Propellers (fans) for ventilation apparatus; Ventilation apparatus; Ventilation installations; Fans for ventilating; Roof fans; Room air fans; Ventilating fans; Apparatus for ventilating; Electrical appliances for ventilating; Ventilating apparatus; Ventilating installations; Ventilating instruments; Ventilating units; Electric ceiling fans; Electric cooling fans